Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a7cc50e470e6f9e…

MALICIOUS

PDF

76.3 KB Created: 2021-03-17 14:12:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: cc84fe442f2359d6383fc703312db975 SHA-1: 51355e375eb1366ac036a6f04b992c126c0a880b SHA-256: 6a7cc50e470e6f9eaab97455c53d0898f03778f9cc28698efa2b6765a2d6983d
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://xajibur.ru/award?keyword=analog+and+digital+communication+chitode+pdf PDF link annotation
    • https://cdn.sqhk.co/wanoposuj/hdjiAhd/free_slots_casino_games_no_download.pdfIn PDF document text
    • http://nunamekom.iblogger.org/borders_for_a4_sheet_black_and_white.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473035/normal_604cc2ff5d567.pdfIn PDF document text
    • https://cdn.sqhk.co/gatutojuse/iicjgfo/nissan_cube_dashboard_symbols.pdfIn PDF document text
    • http://fexuvukenix.22web.org/business_proposal_email_to_client_template.pdfIn PDF document text
    • http://paxawujaxoda.22web.org/70434811850.pdfIn PDF document text
    • https://cdn.sqhk.co/nikajovefer/jdwiapy/big_head_fighting_games.pdfIn PDF document text
    • https://cdn.sqhk.co/kowalaxu/xmtmkha/creighton_emergency_dental_omaha_ne.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368467/normal_6001c6486f088.pdfIn PDF document text
    • https://cdn.sqhk.co/kisunika/hjnghAY/fimuwakupudogebokata.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vatujub.rf.gd/free_printable_blank_invitations_templates.pdfIn PDF document text
    • https://s3.amazonaws.com/wajufifenoxuj/emulator_ps2_kuyhaa.pdfIn PDF document text
    • https://49b821e7-ee7e-41b4-809b-d0417b8c1ddf.filesusr.com/ugd/927743_2321ee2919f54a6885f2343cf1c6614d.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/padosumifubobo/filezuledinogejebeseto.pdfIn PDF document text
    • https://s3.amazonaws.com/fezenur/20040223302.pdfIn PDF document text
    • https://78bdfa25-736e-4945-a764-db21511aacb9.filesusr.com/ugd/9bd82e_265e93a7c5f24ed289989ca7cc5119f1.pdf?index=trueIn PDF document text
    • https://bd7a0a6f-bbfd-49cc-ba41-c3f2778102d9.filesusr.com/ugd/9ea91e_4ce86112705e463f8ece5c87cf759c94.pdf?index=trueIn PDF document text
    • http://fevurilaj.epizy.com/sennheiser_ew_100_g4-845-s-a1.pdfIn PDF document text
    • https://s3.amazonaws.com/muwomapotumugi/livro_de_receitas_alimentao_saudavel.pdfIn PDF document text
    • https://cc652f91-b1ab-470c-b36f-46d838ef85b2.filesusr.com/ugd/fbccce_7202c36b48924db08f7a0df95cfedac2.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ecfc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECFC 5284 bytes
SHA-256: 71cda5b4aca407bcec89cd0b2850576caf9c9c06ae9489c9c72ae717b38b2afa
font_01_sfnt_off0000fed7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFED7 10844 bytes
SHA-256: 2ea3e552dd6af4794c8e15d525cb84da886e4044f88709cb1042693c5536391c

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