Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a15c034d54af74e…

MALICIOUS

PDF

80.2 KB Created: 2021-04-07 08:51:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 12432265bcfe95b5267b5c00c0f83280 SHA-1: 1d0a289ea133e997e040acb61d3c3a82daa57e2b SHA-256: 4a15c034d54af74e88d1f9ecea2cfc18a0c9cc7fdc0f199f10b4d633e222e421
166 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

The sample is a PDF file flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV detection as a phishing trojan. The 'SE_BROWSER_INSTALL_LURE' heuristic indicates the document's content is designed to trick users into installing a fake browser update or extension. While no scripts were directly extracted, the PDF structure and embedded URLs suggest a social engineering attack aimed at delivering a secondary payload or harvesting credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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/123?utm_term=analytical+mechanics+book+pdf PDF link annotation
    • http://taygerr.com/gujedqtfke.pdfIn PDF document text
    • http://trysalon.xyz/fopepotarigavaz61v5.pdfIn PDF document text
    • https://jetorijeroxu.weebly.com/uploads/1/3/4/6/134693882/suxerajivixilebewa.pdfIn PDF document text
    • http://online-sistem.site/free_food_and_medicine_edible_plants_guide_markus_rothkranzpo2j7.pdfIn PDF document text
    • https://rizizisexulap.weebly.com/uploads/1/3/1/4/131407181/dozale.pdfIn PDF document text
    • https://kitigenuripoduj.weebly.com/uploads/1/3/1/0/131070171/jotafirujumeta.pdfIn PDF document text
    • http://alcozerox.com/laboratory_5_cell_respiration_answer_keyzm0uv.pdfIn PDF document text
    • https://xizirujikalowev.weebly.com/uploads/1/3/1/4/131454807/7ae8c3cf656.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/dosalapasenow/ranixupebifuziralidi.pdfIn PDF document text
    • https://43a2ba88-5de9-465b-b95f-6a4d82f2d06e.filesusr.com/ugd/dcbeda_68a6fb5f5e0440488c52dc6ccf13e658.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vekodupiwarobi/semi_formal_plus_size_dresses_near_me.pdfIn PDF document text
    • https://d7ae471b-a447-437d-81b4-4e603f8679d9.filesusr.com/ugd/0a3240_30bc8630f9b44aa7b5283f2a6eed449e.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c938492f-c884-450e-b6ec-620c0c6d5be4/83813947335.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/98ed83bf-9e3a-4f78-8097-f86d97725835/beats_pro_wireless_charging_problems.pdfIn PDF document text
    • https://a0f88182-e1f9-4a9c-ba22-d5ce004c6985.filesusr.com/ugd/2f3216_6cfb88768fcd4bcc94afb3b438cde7a5.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/cf94eb30-95f4-4c96-b80d-6c794d057380/what_skills_and_knowledge_are_required_to_communicate_effectively.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/678bf286-be0f-4d06-8ef2-c2b4372d928e/pupamikefuwela.pdfIn PDF document text
    • https://s3.amazonaws.com/nopomewegobij/secret_window_secret_garden.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fa2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA2A 5596 bytes
SHA-256: 990640cacdf1320cae6d6fe736b0e989c05118ca05014752e8862467736113f0
font_01_sfnt_off00010d15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D15 10868 bytes
SHA-256: b31c3b2cc938d46aa775e13b124d8f3c70ddb6cbdfa4029b090b6ef3123a1504

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