Malicious PDF — malware analysis report

Static analysis result for SHA-256 b17571b9e673c943…

MALICIOUS

PDF

95.7 KB Created: 2021-03-17 23:47:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: aed061fa3fadf7f5d4fa0793d39ae430 SHA-1: d77c04d6fc16d4feecfc8b25134b9a64bf965a08 SHA-256: b17571b9e673c9430f8912c55f011ad6c2355e3b5df248668dfd30a5c76006d5
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of external links, many pointing to disposable domains, suggesting a link farm used for phishing or distributing further malware. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were extracted, the PDF structure and embedded URLs are indicative of a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://jottigo.ru/strik?utm_term=data+science+course+handbook+monash PDF link annotation
    • http://giwudogor.scienceontheweb.net/vaker.pdfIn PDF document text
    • http://wudazex.sportsontheweb.net/reluwuluvadalo.pdfIn PDF document text
    • http://fontawesome.iohttp://fontawesome.io/license/In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/b15a1f29-72e7-4853-a647-f2e99c4ec53f/how_to_get_real_estate_agent_license.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/70bd7888-8bdd-4bea-bddb-29147a218187/34616685011.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/57405e66-7fcf-425c-83f7-fcef4d8562fd/66291457526.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3ce64a41-7527-45bd-aa53-c71dd0c793d3/kegedegezipiroxitowijenad.pdfIn PDF document text
    • http://gosaduzunake.myartsonline.com/94099370906.pdfIn PDF document text
    • http://xukokumo.myartsonline.com/what_is_your_slant_meaning.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/87725466-3d10-4054-8e26-66a23c2ebd18/la_hora_de_la_estrella.pdfIn PDF document text
    • http://paguxesij.myartsonline.com/gepinuzu.pdfIn PDF document text
    • https://eecb1da5-82b7-48ef-90e5-6a20895c07e7.filesusr.com/ugd/88a84f_d9e59b50de9d4bd9a51fbf55d820f06e.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/022e5718-0589-464a-9662-409f1a3490ec/gujigafediwe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aec1fabb-11a5-47c1-a2e5-c117fe8aa3f9/smile_by_raina_telgemeier_characters.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d4380057-db4c-46e7-a5c2-16fd855489da/how_to_solve_rewrite_in_slope_intercept_formula.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d4859fc5-a722-49a3-aa78-2ed0dcd43b45/44048511618.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5f62c6b5-34a9-4fc1-ace8-0e41809a150e/wavijefipibevironepiwoxen.pdfIn PDF document text
    • https://ced6af22-cf5f-4df0-9cd6-2d424634d287.filesusr.com/ugd/3eed2b_6aefdb0dcd8648778af3f4fc4b0aed8d.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/3b26bfee-ad5e-4910-88a9-601a7d569c65/15539309122.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0d5f9680-0361-45a8-9705-659b080b3e1b/where_is_genie_intellicode_learn_button.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2a3f4c5b-66d8-4258-92b8-ddcf05914f3e/vofogefi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0fd03ee7-336a-4c6e-9fcf-09ee8a845389/80909087300.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5be031fd-c569-41c4-a69b-d9f7b90f6cb4/argumentative_essay_topics_for_class_10_icse.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e7438dd8-e1ea-4df3-ab0a-6e5294904a6e/womom.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2bfa412a-c097-4bc1-bdcd-4909b460763c/most_realistic_electric_fireplace_insert_2019.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/06505580-8014-41ab-908b-f91e1395be5b/crt_service_menu.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000120c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120C7 1960 bytes
SHA-256: 07bb00c3b05e2a4213b751eb25ab941db3e44d11f875ba64b1b4c89fdbf8617a
font_01_sfnt_off00012a11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A11 5232 bytes
SHA-256: e4799a569671e638b6556f29d127035a150473c9a4fc1ee1f06a0dc255616525
font_02_sfnt_off00013ba2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BA2 11332 bytes
SHA-256: 0872e70c399b0ebcdb5c85d37be93d0269692d3a4d3af4d6662df34e3ee60c97
font_03_sfnt_off0001622b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1622B 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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