Malicious PDF — malware analysis report

Static analysis result for SHA-256 b55f36838a10e136…

MALICIOUS

PDF

70.9 KB Created: 2020-12-28 16:47:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 61bb3c55d13e4f752cfd4c6fd16c1602 SHA-1: 9eb261c5beba5e9407d7c55dff83defe9427171e SHA-256: b55f36838a10e13688a7cc7c65e69df3dbff6f5d258ae5d9a6a61701a9b585a6
186 Risk Score
Tags
free-cdn-ebook-manual-lure

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. The file contains a large number of external links, many pointing to disposable hosting services, suggesting a link farm or phishing operation. The embedded URLs are likely used to redirect users to malicious sites, potentially for credential harvesting or malware distribution.

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://traffset.ru/strik?utm_term=wedding+cake+icing+flowers PDF link annotation
    • https://cdn.sqhk.co/koxajavu/0sOhfgj/9297497042.pdfIn PDF document text
    • https://bozobamawokoruv.weebly.com/uploads/1/3/4/3/134350924/wasatutugulima.pdfIn PDF document text
    • https://cdn.sqhk.co/vavuvalegel/ihpDPhj/slime_live_wallpaper_apk_pro.pdfIn PDF document text
    • https://sazavilekin.weebly.com/uploads/1/3/4/8/134851962/bumuwakevepej_tikuj_wesem_fotude.pdfIn PDF document text
    • https://safasisi.weebly.com/uploads/1/3/4/4/134472516/5427864.pdfIn PDF document text
    • https://wimolakerozer.weebly.com/uploads/1/3/4/4/134448160/kutiz.pdfIn PDF document text
    • https://tebudewuve.weebly.com/uploads/1/3/2/6/132683230/9981052.pdfIn PDF document text
    • https://cdn.sqhk.co/ditetona/hgijVjv/lotitoxusep.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/8f83d4ec-a6aa-4f04-84d3-e4375417da7f/vocabulaire_les_animaux_et_leur_petit.pdfIn PDF document text
    • https://s3.amazonaws.com/rokuwapesu/45128321191.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b11e5375-0f5a-4947-96cf-3aeccaaae8ca/pomexe.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 8

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_off0000d86b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD86B 5360 bytes
SHA-256: d3a7c4c0b76a8814574664e60da9a451052c9078b4c223d3ba5ccdaccbde3069
font_01_sfnt_off0000eadb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEADB 10624 bytes
SHA-256: 2a82e9294e519b340e610bd01ccc98edf18a954f54eae51420cc72c11bf0c7ea

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