Malicious PDF — malware analysis report

Static analysis result for SHA-256 38502549dae382c0…

MALICIOUS

PDF

72.8 KB Created: 2021-01-10 11:09:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 9ff2fa856d4873e182aa4007c2763df7 SHA-1: b7dda213cae10ebbca102017056fa3fc14b1740f SHA-256: 38502549dae382c0a41ea6c53b790a8f7bd633743051b881b0d38401fd43e6af
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of external links, identified as a 'PDF_SEO_LINK_FARM' heuristic. One of these links, 'https://trafftec.ru/123?utm_term=wrote+a+song+for+everyone+chords', is directly embedded. The ML classifier and ClamAV detection strongly indicate maliciousness, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the nature of the link farm suggests an attempt to redirect users to malicious sites, potentially for phishing or to download further payloads.

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/123?utm_term=wrote+a+song+for+everyone+chords PDF link annotation
    • https://mabufome.weebly.com/uploads/1/3/4/8/134880487/790164266.pdfIn PDF document text
    • https://fijojonibiw.weebly.com/uploads/1/3/2/6/132681787/rotizizalipi-xulejowo-wegevok-xutijub.pdfIn PDF document text
    • https://rawunixu.weebly.com/uploads/1/3/4/5/134527334/sapir-wobofox.pdfIn PDF document text
    • https://gesivakegozuk.weebly.com/uploads/1/3/4/7/134768451/maxoboxawogabug.pdfIn PDF document text
    • https://fefumuvujudadi.weebly.com/uploads/1/3/1/6/131606087/jalipulazo-nuxuvavewenap.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422144/normal_5fa6b6ec0703c.pdfIn PDF document text
    • https://site-1166618.mozfiles.com/files/1166618/makerbot_method_user_manual.pdfIn PDF document text
    • https://naxesitigas.weebly.com/uploads/1/3/0/7/130740165/wunatu.pdfIn PDF document text
    • https://mozesewopizudal.weebly.com/uploads/1/3/4/3/134363743/762c799599.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/bidemewufa/tusedu.pdfIn PDF document text
    • https://s3.amazonaws.com/xupimaral/my_portal_wvusd_stu.pdfIn PDF document text
    • https://s3.amazonaws.com/xotomisen/29324085066.pdfIn PDF document text
    • https://s3.amazonaws.com/rokuwapesu/maplestory_mobile_mesos_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/xanebavifamopez/60942409609.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_off0000e03d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE03D 5428 bytes
SHA-256: 8779909c8ea6ae4adfb16cdc312680a41123433dda26c9499b4c17443c94c030
font_01_sfnt_off0000f2c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2C1 10452 bytes
SHA-256: 2c76355e640918c09ce848643d27dc1229b5272a85140fd9df7d7a65f2836d3c

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