Malicious PDF — malware analysis report

Static analysis result for SHA-256 844b8d15872dea28…

MALICIOUS

PDF

75.4 KB Created: 2021-03-26 08:44:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 068d5640fff3612a1a74f168662f95d8 SHA-1: 8dac4f6de7c54f194f5b0bebde215f77db802be5 SHA-256: 844b8d15872dea28fb44509e3c361b282d81b5ac0ba419b784920ea2e87a899b
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to disposable domains, indicative of a link farm designed to redirect users to malicious content. Heuristics indicate it's a link farm on disposable hosting and a ML classifier flagged it as malicious. The presence of external URIs and the overall structure suggest this PDF is a lure to phishing or malware distribution sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 5

  • 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 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://ponafet.ru/award?keyword=esl+beginner+conversation+pdf PDF link annotation
    • http://m-ryanaf.site/nelson_international_business_textbookhgnuy.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366959/normal_5fe098025b2c2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408981/normal_5fe2b082ec361.pdfIn PDF document text
    • http://urro-hu.com/zomusupamotezewaw8ulkp.pdfIn PDF document text
    • http://tgesheff.xyz/seagate_barracuda_7200._11jor0q.pdfIn PDF document text
    • http://wbigs.space/bunexusopebedatewopitolojk1uin.pdfIn PDF document text
    • http://onlinetyz.xyz/confiana_cega_brennan_mannings5grq.pdfIn PDF document text
    • http://usacreditcheck.info/how_do_you_write_a_resume_for_college_with_no_experience3x9qe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420454/normal_5fd632dbbe835.pdfIn PDF document text
    • http://menbp.online/398940511605hz5t.pdfIn PDF document text
    • http://hardcreditcheck.info/what_was_the_affordable_care_actlvxtw.pdfIn PDF document text
    • http://mimasajikataza.iblogger.org/pepcid_davis_drug_guide.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369520/normal_6012bf4e9fcae.pdfIn PDF document text
    • http://becloud.website/dragon_age_origins_character_build_guidereh4g.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481402/normal_5ffb95338afd8.pdfIn PDF document text
    • http://goodsun.space/skyjack_scissor_lift_parts_manualhbrvh.pdfIn PDF document text
    • http://magicwoolshop.com/pipe_roughness_tableiaajg.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/30f00ab5-be71-46e4-bdc8-5f6b3f2e1d5f/tcp_ip_osi_layer_comparison.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f62b70d6-ac14-4d43-8a8b-fe90c58525f8/wisdom_for_mothers_book.pdfIn PDF document text
    • http://gegepazanonera.rf.gd/hip_exercises_bursitis.pdfIn PDF document text
    • http://torogadebiwi.rf.gd/kogafeb.pdfIn PDF document text
    • http://puredaw.rf.gd/pofijoturexabo.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_off0000e7ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7BA 5480 bytes
SHA-256: c4e0a850f7e379ce5b544990a308e42ef5eb3063e6d386a2f3796eff9e77c09d
font_01_sfnt_off0000fa77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA77 11104 bytes
SHA-256: 74d5809938a9135278a05936a865d2f1b7406f3af0ed1d8ebbdf0931a25eb99a

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