Malicious PDF — malware analysis report

Static analysis result for SHA-256 76bc51df4eecc772…

MALICIOUS

PDF

73.7 KB Created: 2021-03-23 09:49:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-01
MD5: a3a1b65e8a842f5fa8be0bb5e592352e SHA-1: 8ff5b3fa5ebd5a59821226e19d223628a5fb9738 SHA-256: 76bc51df4eecc772ac844411146fb4056329c4007f4ec02d9ca576a04f875f38
186 Risk Score

Malware Insights

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

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 0.9995

Heuristics 6

  • 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 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://xajibur.ru/award?keyword=anorganick%25C3%25A1+ch%25C3%25A9mia+%25C5%25A1ima+pdf PDF link annotation
    • https://suzotavuni.weebly.com/uploads/1/3/4/7/134765747/lafotogot-roloxijev-zofewufakam.pdfIn PDF document text
    • http://scarcebook.com/jinabaz77kd.pdfIn PDF document text
    • https://tejukazirinari.weebly.com/uploads/1/3/1/3/131398521/bominudim-xavalafakuzotib.pdfIn PDF document text
    • https://kaperimivegorew.weebly.com/uploads/1/3/4/3/134371305/xofatozesovete.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408995/normal_5fffa8142358d.pdfIn PDF document text
    • https://bewuzitavunu.weebly.com/uploads/1/3/4/3/134349104/b26df98.pdfIn PDF document text
    • http://hookup754.fun/elements_of_typographic_style8w4bp.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4428062/normal_604fe35ac083f.pdfIn PDF document text
    • https://sevujixosatanin.weebly.com/uploads/1/3/5/3/135316334/tezup_mumomive.pdfIn PDF document text
    • https://nuvarimo.weebly.com/uploads/1/3/1/3/131378817/1973d71766.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451018/normal_5fc5dff3ec51b.pdfIn PDF document text
    • http://1green.space/lipomevonuwufezemesowises899w.pdfIn PDF document text
    • https://vodoxakitukep.weebly.com/uploads/1/3/4/3/134335140/8e3795943de.pdfIn PDF document text
    • https://pexafibilo.weebly.com/uploads/1/3/4/4/134484824/mopone.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391920/normal_5fe678fc29c7c.pdfIn PDF document text
    • http://chambreapp.xyz/mikazadukazimefjw9xf.pdfIn PDF document text
    • http://ru-dev.xyz/32871376428403g.pdfIn PDF document text
    • https://merudaxesu.weebly.com/uploads/1/3/1/3/131383629/167ba47574b1.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://s3.amazonaws.com/vikukinumet/cartoon_network_guide_australia.pdfIn PDF document text
    • https://s3.amazonaws.com/bibejovixapis/frontier_fios_channel_guide_tampa.pdfIn PDF document text
    • https://s3.amazonaws.com/rudelazifizuvo/website_offline_er_android.pdfIn PDF document text
    • https://s3.amazonaws.com/silubebebefuju/v_c_d_ka_full_form.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d07e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD07E 5584 bytes
SHA-256: d3291f32a6af484456839be070d517fadb02f489c1b8a19c24c0ed82691f4cd8
font_01_sfnt_off0000e2b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2B3 12692 bytes
SHA-256: a221033ec5f315a10902943354a0ab2bd3df2a61ea08b3315fe13ef34f1f9982
font_02_sfnt_off00010954.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10954 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3