Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8d59f631a7d40d4…

MALICIOUS

PDF

82.2 KB Created: 2021-06-08 19:39:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: f3f41a94f65d835e758776ab7fb76164 SHA-1: e4ca8dd9c29fc52704ac07bb35f0bd9e768589d2 SHA-256: e8d59f631a7d40d49c403b9ed6dd4f957cdeff3b027c44fe48bfdc5c1163bc85
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by both ClamAV and an ML classifier. It contains a large number of external links, many pointing to disposable hosting, indicating a link farm designed to direct users to potentially malicious content. The presence of embedded URLs and the heuristic 'PDF_SEO_LINK_FARM' strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://huntic.ru/pbw?utm_term=boku+no+hero+academia+hero+rising+full+movie PDF link annotation
    • https://sevenunoxesu.weebly.com/uploads/1/3/4/3/134341304/dofez.pdfIn PDF document text
    • https://noribiri.weebly.com/uploads/1/3/5/3/135347041/6687730.pdfIn PDF document text
    • https://vixadabunukup.weebly.com/uploads/1/3/4/9/134902839/c612649861.pdfIn PDF document text
    • https://nikadarax.weebly.com/uploads/1/3/4/5/134585483/08cdb3.pdfIn PDF document text
    • https://kawepuwaseleza.weebly.com/uploads/1/3/4/8/134849925/pasataxijiv_sixununepol.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vugufosenene.pbworks.com/f/rejawakibizegipokibi.pdfIn PDF document text
    • http://numefen.pbworks.com/f/tegulomeribux.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/214dc80b-ffbb-416f-8cbd-ab3c767355e5/rozexojop.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1c10d125-8e54-4fdc-bcb1-c26cecf740e2/how_to_replace_battery_in_kindle_fire_10.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/99ef8b7c-7d27-4938-ab9d-f343607a32b5/45946877241.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eec6a36c-3687-4c6e-829a-61e645b66c42/what_animal_is_a_symbol_of_courage.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a9b0b1d9-09d2-49e6-974a-e33da00d3034/sig_sauer_p226_air_pistol_magazine_uk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dff2a2b5-06a6-4ba8-88eb-e3994f031c32/macbeth_act_3_multiple_choice_quiz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b2c28933-18a0-48c4-81ab-f090bb4ba392/free_call_app_premium_mod_apk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5c652618-34dd-466a-9fa6-2848508b243f/denon_avr_3312_service_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8791e8f5-f065-4dd6-8f46-73425550d001/18779196466.pdfIn PDF document text
    • http://vikiruji.pbworks.com/f/35755827108.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/86e22987-fae7-4f8c-bb86-c6beae2aaa97/wewarejeritefibo.pdfIn PDF document text
    • http://sipibujewadu.pbworks.com/f/movevimomaxariwokel.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9338c319-05c7-49d2-9c80-a41dc1a4e990/what_do_high_hgb_levels_indicate.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ce745d63-a086-4230-bcda-e6e8420e006a/10188664719.pdfIn PDF document text
    • http://doxawadar.pbworks.com/w/file/fetch/144793167/resume_template_google_docs_reddit.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ede3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDE3 4920 bytes
SHA-256: b5526e8d01ebeb275aea28801e4bd4f8d657a377e9f863ac1942f82ef790ae9f
font_01_sfnt_off0000ff24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF24 5608 bytes
SHA-256: 05bb884e28e5704cf09f9cadd29c09ca4f7020cd4bd52ed76ff96d48dcdc50cd
font_02_sfnt_off00011217.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11217 12084 bytes
SHA-256: dc7ce4da84a2d077dd21329173747fcb1766a303d0cf09792d4fc077100918f6

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