Malicious PDF — malware analysis report

Static analysis result for SHA-256 142a35c39513b719…

MALICIOUS

PDF

77.0 KB Created: 2021-06-07 17:17:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: cb478007d9159a6ed0049cca598a0caa SHA-1: 66d2cb2cbb0dfda6553dbf546e53632a0d94b51f SHA-256: 142a35c39513b7197578cbfdb97db9215b1cf032ef7874619f849d7f97b9c84a
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 hosting, suggesting a link farm or phishing operation. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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
  • 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://catamma.ru/pbw?utm_term=zygor+guides+free+download+8.3 PDF link annotation
    • https://vabemeraronoj.weebly.com/uploads/1/3/1/4/131452983/xazodetebabonu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420238/normal_602ecd9a5338b.pdfIn PDF document text
    • https://vixififevi.weebly.com/uploads/1/3/5/3/135346472/1208907.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447880/normal_601b32ed20456.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465930/normal_60548659498d2.pdfIn PDF document text
    • https://nijawefevijabit.weebly.com/uploads/1/3/4/6/134665626/4603749.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368955/normal_602c8cf3813a0.pdfIn PDF document text
    • https://xitodilizunew.weebly.com/uploads/1/3/4/1/134108755/sorudutifuxun_doveje_balarunobuzu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://finatin.pbworks.com/w/file/fetch/144500487/87933787399.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/15ac746a-9ca7-48bc-983a-3649f89863d2/31693686231.pdfIn PDF document text
    • http://tisowowuduwe.pbworks.com/f/primavera_silenciosa_resumen_por_captulos.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b83a112c-13ef-4966-a459-0088352674b4/81473027581.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2eab473f-3763-446b-ad19-98ebaba0fb73/41275890409.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c041dceb-0235-4596-b277-cb2a1b3f191d/82972514009.pdfIn PDF document text
    • http://zuvuzut.pbworks.com/w/file/fetch/144550836/how_to_get_support_creator_code.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b2e967fe-e670-4cf8-8a5b-9338b4f862f6/troilus_and_cressida_character_crossword.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/44174b4c-b8ac-45f4-96a0-02f8ae7c82eb/what_are_synonyms_for_stressed.pdfIn PDF document text
    • http://xosezoranad.pbworks.com/w/file/fetch/144610449/rush_royale_random_pvp_tower_defense_mod_apk.pdfIn PDF document text
    • http://nilanom.pbworks.com/f/cloud_computing_quiz_questions_and_answers.pdfIn PDF document text
    • http://lipovosufuk.pbworks.com/f/foxixajatamosejutade.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b10f5b12-0f44-41f2-99ae-e3c3a0195984/gitizitirapibefa.pdfIn PDF document text
    • http://lifuzopa.pbworks.com/f/nopuvo.pdfIn PDF document text
    • http://lagawiwefe.pbworks.com/f/fisher_paykel_2_drawer_dishwasher_handle_replacement.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e4b2887a-a043-4015-b25f-dbc4cae8e1dc/aci_concrete_placement_of_kansas_llc.pdfIn PDF document text
    • http://giwupiraride.pbworks.com/w/file/fetch/144461139/xadevumapuxaxinu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f3d943a1-78d5-4002-bed2-e2dca3699d91/robixogamurov.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_off0000ee11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE11 5616 bytes
SHA-256: cc13a4bdce737f58d7b9f1f11258c55ce04db90d3afacfb157e7be8683a71616
font_01_sfnt_off00010161.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10161 11060 bytes
SHA-256: ad1330daeef7659dd1111242aecf529e8c4812949c6e552bc040d9a242244650

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