Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e2aad0839be7b48…

MALICIOUS

PDF

75.8 KB Created: 2021-03-28 11:47:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 166a498f881be5b4630409ab763e0c31 SHA-1: cd8504b215c32b045f1461a784510dbbb01ba0fa SHA-256: 8e2aad0839be7b4829bd0c8f61d75314a794a11398ecfed5952447c8c316500b
186 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 PDF contains numerous external links, identified by the PDF_SEO_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM heuristics, suggesting a link farm or SEO poisoning attack. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the nature of the link farm suggests it could lead to further malicious content or exploits.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://zajinet.ru/award?keyword=chordate+zoology+practical+pdf PDF link annotation
    • https://cdn.sqhk.co/nafusomo/mjcq26X/any_call_center_jobs_near_me.pdfIn PDF document text
    • http://freefire-gifts.com/diagnosis_and_treatment_of_chronic_kidney_failuredt9bt.pdfIn PDF document text
    • https://cdn.sqhk.co/wirujurumugi/Cibgijc/43343611700.pdfIn PDF document text
    • http://help-copyrightviolationhelpcenter.com/vovotafunorovubobodaditc.pdfIn PDF document text
    • https://cdn.sqhk.co/bikuloxisage/mjaIGhc/90552378570.pdfIn PDF document text
    • http://sodahub.pro/where_are_dead_stars_in_ghost_recon_breakpointw954h.pdfIn PDF document text
    • http://xozonline.ru/cuisinart_extreme_brewolmw6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405660/normal_60469adee74e1.pdfIn PDF document text
    • http://erogan24.website/8.3_dna_replication_study_guide_worksheet_answerscwew7.pdfIn PDF document text
    • http://lotto-investclub.com/66957302775tyec9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406771/normal_6010a83356ceb.pdfIn PDF document text
    • https://cdn.sqhk.co/jubawiwa/F3hfhel/sniper_3d_fun_offline_gun_shooting_games_free.pdfIn PDF document text
    • https://cdn.sqhk.co/sobexofap/iJShfhv/world_cup_qualifiers_schedule_europe.pdfIn 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/22df5fd6-f4cb-46a4-860e-22d47c0dd8ca/88170815666.pdfIn PDF document text
    • https://d5bea983-5bca-41ba-aae6-6b688785cc77.filesusr.com/ugd/9ec29b_5eadb6097d964dd081acd72dc407954f.pdf?index=trueIn PDF document text
    • https://2b4b9a66-705d-4e40-a31d-28d4db190467.filesusr.com/ugd/1dbb98_b1f07fe81e5547009cab6abf0c4ddd6f.pdf?index=trueIn PDF document text
    • https://f1cb2ec4-a82d-4768-8a06-5236a2db220e.filesusr.com/ugd/a2e20a_f167170ad28548848e06676b87c77417.pdf?index=trueIn PDF document text
    • https://66f9c2bc-82a6-463d-9ccd-9c94d3d8805e.filesusr.com/ugd/b361c6_5a4fe00751d340d19a12cd24ab995b38.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c9a3b18d-d74a-4e2d-a437-c26de4a050b2/reaccion_de_combustion_del_buteno.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ea1762b9-5f93-41cb-9ba1-c9b99adb7df1/book_report_worksheets_grade_3.pdfIn PDF document text
    • https://6bc61794-ec17-45f1-96eb-8bed4cd57308.filesusr.com/ugd/217b8a_62849610f69840e4a0fba4d7d12894ea.pdf?index=trueIn 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dd19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD19 5096 bytes
SHA-256: 086acf162b5f8d2aff243ef3b45929759a1194c99e96d476809635eec224ee4a
font_01_sfnt_off0000ee9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE9F 10884 bytes
SHA-256: 75c734c624c470906f9172157b5220892abaf2fdb310b4b8ac1ddb3c50a06cd3
font_02_sfnt_off000113cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113CD 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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