Malicious PDF — malware analysis report

Static analysis result for SHA-256 e860d77515d91642…

MALICIOUS

PDF

80.9 KB Created: 2021-02-26 14:43:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 36178c586fee7cdd6600406656dd1f42 SHA-1: 731977f16a0e38302510a505e0c5653835f3a75a SHA-256: e860d77515d91642a8a3631cc51b3dc5a9cc9e12659191e049f662d656fffe9f
126 Risk Score

Malware Insights

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

The PDF contains numerous external URIs, many of which are hosted on disposable domains and appear to be link farms, suggesting a distribution or phishing campaign. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a likely attempt to redirect users to malicious content or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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/123?utm_term=hp+officejet+4500+all-in-one+printer PDF link annotation
    • https://cdn.sqhk.co/midusuworab/jfDiiGs/offroad_car_game_download_for_pc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366984/normal_603583119adb7.pdfIn PDF document text
    • http://sokolov.fun/merck_chloroform_coag6u3y.pdfIn PDF document text
    • http://detonic-italia.website/lepazeporifebaz9e1ju.pdfIn PDF document text
    • http://micrometerdigital.xyz/mrityunjay_marathi_kadambaribkcwm.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489993/normal_6005424117945.pdfIn PDF document text
    • http://moitender.org/lasivo3wxw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476127/normal_602f6d8f36630.pdfIn PDF document text
    • http://romeita.space/munchkin_epic_ruless12di.pdfIn PDF document text
    • http://verifiedbadges-form.com/fishman_loudbox_performer_reviewdvnrt.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453142/normal_6030a9d099186.pdfIn PDF document text
    • http://white-x.fun/investigative_report_writing6v6rt.pdfIn PDF document text
    • http://dalnoboyi.xyz/black_panther_full_movie5g25q.pdfIn PDF document text
    • http://habercigo.com/poisson_distribution_sample_variance5fpf8.pdfIn PDF document text
    • http://endi-itali.space/3518424751z8jfi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415045/normal_60154435b1b1f.pdfIn PDF document text
    • http://kyukty68.xyz/202996519681pakj.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000ffd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFD5 5252 bytes
SHA-256: ad6b73a0a7f447c74ce507226c6a68a170e4be38f4436a4f9a15c36d728467ed
font_01_sfnt_off000111df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111DF 10784 bytes
SHA-256: cabe0af16454d5b959c4cc1bd49eeac1d7e3a5eaf8d026963d743e3595ea3d29

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