Malicious PDF — malware analysis report

Static analysis result for SHA-256 c47a62baaa54da40…

MALICIOUS

PDF

109.2 KB Created: 2021-03-11 06:24:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 62bd8789ef396ed9245805e34d4f9afb SHA-1: 9b377184dbbe623876e2ef1eaf2e7cefa80ef4de SHA-256: c47a62baaa54da4029745ca19c0dd03dfc6ec1149ab9b27f595a93e8b044adcf
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many pointing to disposable hosting services, suggesting a link farm or SEO manipulation tactic. The presence of embedded URLs and the PDF structure strongly suggest it's designed to redirect users to potentially harmful content, possibly as a phishing or malware distribution vector.

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://mezovuduw.ru/award?keyword=afrocentric+psychology+pdf PDF link annotation
    • https://cdn.sqhk.co/nobukomorur/iijfKjj/56419702532.pdfIn PDF document text
    • https://cdn.sqhk.co/ruvuwoki/6Ggc4of/jujuzedarewoba.pdfIn PDF document text
    • https://pivorexivasij.weebly.com/uploads/1/3/4/4/134489734/5023979.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496585/normal_601eace34cee1.pdfIn PDF document text
    • https://cdn.sqhk.co/xafemepino/MzhhxqX/22273528653.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455684/normal_60468e9a69d2d.pdfIn PDF document text
    • https://pigasuranebuja.weebly.com/uploads/1/3/4/4/134459694/7823983.pdfIn PDF document text
    • https://cdn.sqhk.co/gipagigo/ig2ifwK/xomeveko.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485451/normal_6040de4e84479.pdfIn PDF document text
    • https://zumukematil.weebly.com/uploads/1/3/4/7/134716366/d731bc5f1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4455381/normal_5fe27c6baba59.pdfIn PDF document text
    • https://saxexowiki.weebly.com/uploads/1/3/0/9/130969873/1165315.pdfIn PDF document text
    • https://cdn.sqhk.co/sipobufiw/ihiimVP/lirekiwi.pdfIn PDF document text
    • https://xeneniwavufew.weebly.com/uploads/1/3/2/8/132814439/0fafed1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409238/normal_5ffa188a66d46.pdfIn PDF document text
    • https://cdn.sqhk.co/romilononove/gfjgEo0/airplane_tickets_to_florida_miami.pdfIn PDF document text
    • https://gajebafanagifim.weebly.com/uploads/1/3/2/8/132815836/xadekewagaz.pdfIn PDF document text
    • https://cdn.sqhk.co/rasepotobami/aaWe6m6/catch_mastery_ghosh.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/poresi/electronic_signature_policy_for_medical_records_template.pdfIn PDF document text
    • https://s3.amazonaws.com/luropiw/nawomaram.pdfIn PDF document text
    • https://s3.amazonaws.com/vovabagubajegeb/cbspd_gi_scope_study_guide_3rd_edition.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_off00017123.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17123 5300 bytes
SHA-256: 4008ac6be5b1818c4464215691c13f130887cd55da5a968c08b5519624e85d71
font_01_sfnt_off00018336.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18336 10424 bytes
SHA-256: aed2105c62caf2852b7bccc2e334b766109001fa063f25be5b14e36c3648fb2b

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