Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb8501518a6cca9f…

MALICIOUS

PDF

68.8 KB Created: 2021-04-06 04:23:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: b3d4da659d0a52833f959c64a96c9226 SHA-1: d59d93c70209903bdda7ff3230ef26a6cc4771f8 SHA-256: cb8501518a6cca9f22fdda9004c32587829dcf7f888b8840d7a3efcc7ad1f40c
186 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The primary URL, https://vilenefex.ru/wix?keyword=graphing+polynomial+functions+worksheet+doc, indicates a lure related to educational content. No scripts were extracted, but the PDF structure and numerous external links point towards an attempt to redirect users to malicious sites.

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://vilenefex.ru/wix?keyword=graphing+polynomial+functions+worksheet+doc PDF link annotation
    • https://jevebuna.weebly.com/uploads/1/3/4/5/134594548/7008246.pdfIn PDF document text
    • https://cdn.sqhk.co/mogudekusab/eghzhjz/sorumamizigez.pdfIn PDF document text
    • https://cdn.sqhk.co/girolivudafo/igBqXB0/funny_anniversary_gifts_for_girlfriend.pdfIn PDF document text
    • https://cdn.sqhk.co/taviboku/jg2V7s5/flying_jatt_film_free_download.pdfIn PDF document text
    • https://bativazuwa.weebly.com/uploads/1/3/0/9/130969541/a8802b.pdfIn PDF document text
    • https://fubabogi.weebly.com/uploads/1/3/4/6/134617409/likitiwovuzi-vojeratojiseto-warowenapez.pdfIn PDF document text
    • https://cdn.sqhk.co/zurajekiviw/ZhehcoZ/57965742151.pdfIn PDF document text
    • https://zaluzukefajol.weebly.com/uploads/1/3/5/4/135400247/tanelugapenetufu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://506dbbd1-d4b3-44b1-a4c9-6b5d0cab6a23.filesusr.com/ugd/c75f60_5a24d6cfec9748f8ad8a4e4240154868.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/davawina/vuvido.pdfIn PDF document text
    • https://7fad2989-91b8-457c-89bc-9a0e7aeef19f.filesusr.com/ugd/b03ff3_a2313aea049245658db9c3d7968de821.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/2f78c03d-f352-4e52-bae2-3d519f3f4f9c/momasikirawevaretugokal.pdfIn PDF document text
    • https://56db2a4d-09ce-4ff6-a558-abb1d6727cd4.filesusr.com/ugd/003b86_bf883bf6e1954f2ba902048c52a6cf02.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kulinisokakewi/hayward_sp1592_power_flo_matrix_1_hp.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c7c4b66d-ae59-455a-b5ae-b1ef85c2b52d/daretez.pdfIn PDF document text
    • https://7f03322d-63d6-449b-a8c2-a80beffeb2b6.filesusr.com/ugd/2994dd_55c90825faca4d9180b3061e086f7b1d.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/dfbd324d-b221-4630-9cc1-d774f41e91b4/sword_art_online_ps4_games_ranked.pdfIn PDF document text
    • https://s3.amazonaws.com/takateg/73208469034.pdfIn PDF document text
    • https://s3.amazonaws.com/gozilum/battleship_game_for_mobile.pdfIn PDF document text
    • https://b2691e05-be35-46d2-a26d-08c503de0475.filesusr.com/ugd/b15c0b_e9acc9ba1d4c48a8b840bb9d1c8eac57.pdf?index=trueIn PDF document text
    • https://711920be-b761-4f0e-a604-762b26663b16.filesusr.com/ugd/ffcbea_fff09dcdada1458292f54e76cbcca24c.pdf?index=trueIn PDF document text
    • https://d52369c8-37f2-40d9-9d5f-d682b3b4a2e4.filesusr.com/ugd/6d5a7b_66028b9e9cc24289ad987728f9bd07b1.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/dazovosugev/15191659633.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_off0000cc32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC32 5860 bytes
SHA-256: c293a9afacf31547c0b07d955b28c9adfa1649ea32605ccc0f6d688dd1ead65c
font_01_sfnt_off0000e019.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE019 10468 bytes
SHA-256: 38f90be220423b458429d40ce85b8dd237facdee230f790866d0e064a52a04c8

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