Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6dc238d91f80f37…

MALICIOUS

PDF

118.4 KB Created: 2021-04-02 10:59:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: b835a615cd57ea6004402b74943d4cb2 SHA-1: 99805b11a97fb80a962b4edb65a67639b26eda0c SHA-256: a6dc238d91f80f37557824615126c6c369ad26270096eb9237c6be816457401f
186 Risk Score
Tags
free-cdn-ebook-manual-lure

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 0.9997

Heuristics 6

  • 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 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://xezojetit.ru/strik?utm_term=how+many+pages+in+the+book+animal+farm PDF link annotation
    • http://taxokijoba.sportsontheweb.net/what_does_daphnia_feed_on.pdfIn PDF document text
    • https://cdn.sqhk.co/surofowudula/gcgjcie/snapchat_filter_old_camera.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368479/normal_5ff9ff613987b.pdfIn PDF document text
    • https://cdn.sqhk.co/gadewekunel/fgjjbk7/42043523021.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368999/normal_601c028a0fb4a.pdfIn PDF document text
    • https://cdn.sqhk.co/surikuzezun/chjhhVi/24145830638.pdfIn PDF document text
    • https://cdn.sqhk.co/sirijunubi/ehbjcKR/mevulajasim.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424683/normal_5fd6753404939.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/faxaxos/slayer_leecher_v6.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4fbdf458-de36-4167-b11b-b6ae7f5cdea0/bifutiwowikufovikafu.pdfIn PDF document text
    • http://fiforeru.atwebpages.com/folezisef.pdfIn PDF document text
    • https://s3.amazonaws.com/kaxukok/diastasis_recti_exercises_while_pregnant.pdfIn PDF document text
    • https://a35b4eae-300a-44a5-b982-8d633984e519.filesusr.com/ugd/19735e_5ecfbd6f5b6746d8a3376f1ba50a07a9.pdf?index=trueIn PDF document text
    • https://21a67f6d-2aea-439f-a910-ed4feb6be009.filesusr.com/ugd/173616_640abda91045463cb27ef88ac21fbded.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tarizirefevifab/2005_buick_lacrosse_cxs_problems.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8fbd17cf-09c6-460e-8a4e-40fe703fb708/rozurebawalopabaza.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

Related samples 7

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000190b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x190B8 5672 bytes
SHA-256: 74e9849e7ac14253f992bcc02846240dfd178ae2be318416ee5581f00ae08bd8
font_01_sfnt_off0001a3f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A3F1 12124 bytes
SHA-256: e664f0d0c8b4b9ea79d5c1ce290391e25185779b59cb9985e83816fc26d3ffe7

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