Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9b80373819f40e1…

MALICIOUS

PDF

71.1 KB Created: 2020-12-25 14:19:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: f8debc6f92c19a248ec1bd79038ffe20 SHA-1: 0d28af293ff10d1dab652a6c5abf8890de6ee0fb SHA-256: b9b80373819f40e12e457965424a7ff9cd0f02c726096666a56aea875557702d
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains a large number of embedded external links, identified as a "PDF_SEO_LINK_FARM" heuristic. The document body, though heavily obfuscated, suggests a lure related to "Classroom management theories pdf". The presence of numerous external URLs, including those hosted on Weebly, indicates a likely attempt to direct users to malicious or spam content, potentially for phishing or SEO manipulation. ClamAV also detected this as a "Pdf.Phishing.Trojan".

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • 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://trafftec.ru/strik?utm_term=classroom+management+theories+pdf PDF link annotation
    • https://zolalaroka.weebly.com/uploads/1/3/4/5/134591985/vojezugaxu.pdfIn PDF document text
    • https://jamakebowixon.weebly.com/uploads/1/3/4/4/134477175/gigafep.pdfIn PDF document text
    • https://jubekufolofifi.weebly.com/uploads/1/3/4/5/134593927/puwezusapilabofi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388048/normal_5f995fb94d6f7.pdfIn PDF document text
    • https://lurukise.weebly.com/uploads/1/3/4/4/134454795/471291668568.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://uploads.strikinglycdn.com/files/80075f22-14b6-491e-a437-b4fb7a83ba85/45597848850.pdfIn PDF document text
    • https://s3.amazonaws.com/sazixipame/network_analysis_gis.pdfIn PDF document text
    • https://s3.amazonaws.com/zugutixe/askep_aneurisma_aorta_abdominalis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a0535d21-c26a-4dc9-b1f0-3014ea837f49/easy_simple_nail_designs_for_beginners.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ee4ba723-581b-42c5-9677-076ea5653587/86125281014.pdfIn PDF document text
    • https://s3.amazonaws.com/nezanurugega/pirifurokikad.pdfIn PDF document text
    • https://s3.amazonaws.com/nazekisigiduz/cpwd_manual_publications.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ce1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE1E 5268 bytes
SHA-256: bdd905e2cccabfe3a574aa4e8c84ad89f41af3c055f98e6aaf6585f15cc873db
font_01_sfnt_off0000dfd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFD2 9400 bytes
SHA-256: 5bb15e87a130c236e24660217190f79206b6f20b0e792bc39b3fbedfe224b4b2
font_02_sfnt_off0001002f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1002F 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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