Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a8b3def8ee54dcd…

MALICIOUS

PDF

73.0 KB Created: 2020-11-14 03:46:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: e182f56ec43b54b2e96edda5c070827c SHA-1: b612e93d073d9de43c9a22d6eb14ec58e9730b1e SHA-256: 1a8b3def8ee54dcd3585e73a02c545964d1151c5ae17aafba7a40f8762c88135
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'https://cctraff.ru/aws?utm_term=brian+gluckstein+bed+sheets'. This URL is likely used to lure users into a phishing or malware download site. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, but the presence of a malicious URL is sufficient to infer a phishing or malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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://cctraff.ru/aws?utm_term=brian+gluckstein+bed+sheets In PDF document text
    • https://cdn-cms.f-static.net/uploads/4384820/normal_5f9e28c972deb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404975/normal_5fad2428050ce.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392470/normal_5f8e55b4e4147.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459322/normal_5fa98397c58fb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413458/normal_5f9dcbb7ba1de.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366993/normal_5f8a3030e2f63.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/xanebavifamopez/japulopezupofitibil.pdfIn PDF document text
    • https://s3.amazonaws.com/bajuse/evisceration_and_dehiscence.pdfIn PDF document text
    • https://s3.amazonaws.com/subud/ipc-_a-_610d_acceptability_of_electronic_assemblies.pdfIn PDF document text
    • https://s3.amazonaws.com/subud/pulimufexisimewajoba.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/06ece6bf-b78c-411a-bc12-979d475a4d4c/ti_84_plus_ce_online_calculator_free.pdfIn PDF document text
    • https://s3.amazonaws.com/jirebonudur/gerber_life_insurance_cash_surrender_value.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cc1ae3b5-f7ee-4114-bedc-88061831cd1f/pijixekibokuxo.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_off0000e033.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE033 5456 bytes
SHA-256: c22503f829a861eaa3e3ab4059849d9a519156415dec4f0447f71a006005efe5
font_01_sfnt_off0000f2b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2B6 10796 bytes
SHA-256: 0c2eec726f5320c06a1adee02dc76ad7ca646d02f2be91865c02c86143de8cba

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