Malicious PDF — malware analysis report

Static analysis result for SHA-256 a421dadba199f0e1…

MALICIOUS

PDF

75.0 KB Created: 2021-02-27 23:03:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 35ebc576d615f81ebb98ec5096e08f5e SHA-1: 150d1112e4847ebda89912fda6fa77546825db33 SHA-256: a421dadba199f0e141f8f5ae12ba54c37d20b7b8c142af1350167aed8aa203a3
126 Risk Score

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://nipisod.ru/wix?keyword=literary+devices+in+life+of+pi+chapter+1 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4530036/normal_600c601d99133.pdfIn PDF document text
    • http://idealslimitalia-official.site/luzivanavilazolasisivuh63d1.pdfIn PDF document text
    • http://linavaluviriv.getenjoyment.net/45615832627.pdfIn PDF document text
    • http://dronextactical.xyz/church_of_christ_sermon_outlines_powerpointanc0i.pdfIn PDF document text
    • http://static-get.top/17536539667986ud.pdfIn PDF document text
    • http://tublitalia.fun/85413434413z2rl3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4378628/normal_60075a7e39319.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486036/normal_60293caec725a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490515/normal_5ff3a243ab4b2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388819/normal_6009d8c6c955c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485012/normal_601251657443a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403683/normal_5fda5a1ab4038.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bitibidebizofu.epizy.com/2818322935.pdfIn PDF document text
    • http://miganuvag.myartsonline.com/how_do_you_fix_a_generator_that_will_not_produce_electricity.pdfIn PDF document text
    • https://s3.amazonaws.com/wekibik/let_it_go_piano_sheet.pdfIn PDF document text
    • http://zogosugo.onlinewebshop.net/duruziki.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_off0000e8ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8AB 5400 bytes
SHA-256: 8e02858bc30c9b4aef6199646b9bbd796d386fdc61a768ffeaedbc47b0359da7
font_01_sfnt_off0000fb18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB18 10864 bytes
SHA-256: 9656f7022bcbbe4f869426b6f33ce7327043726afd4583cc7bb9d26ccd4ed10b