Malicious PDF — malware analysis report

Static analysis result for SHA-256 40cf6f5030fe4789…

MALICIOUS

PDF

72.4 KB Created: 2020-12-28 00:43:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 2b15272cda5dbee20ca56e5f4c47f376 SHA-1: e6ca121a1cd3c98e8689086c67abb5e5dcf3f3db SHA-256: 40cf6f5030fe478949d76446c3d3bf80fe482452b2c8655aea850817b09dad1c
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. It contains a large number of external links, many pointing to disposable hosting, indicating a link farm or SEO spamming operation. One of the primary URLs, 'https://trafftec.ru/strik?utm_term=dwayne+haskins+contract+signing+bonus', suggests a lure related to a specific event or person, likely to drive traffic to malicious sites. No scripts were extracted, but the PDF structure itself is used to host a large number of external URIs.

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://trafftec.ru/strik?utm_term=dwayne+haskins+contract+signing+bonus PDF link annotation
    • https://cdn.sqhk.co/rosavuzezig/jjTgcj7/vawabudivafiduwuvagisowu.pdfIn PDF document text
    • https://xavoxoxuda.weebly.com/uploads/1/3/1/3/131379246/mudanorovijugulobom.pdfIn PDF document text
    • https://bituxusod.weebly.com/uploads/1/3/4/3/134347303/13dad7.pdfIn PDF document text
    • https://mivosubewo.weebly.com/uploads/1/3/1/4/131407796/4521844.pdfIn PDF document text
    • https://kuromazu.weebly.com/uploads/1/3/2/6/132695519/8195755.pdfIn PDF document text
    • https://cdn.sqhk.co/rosavuzezig/iShehjV/iowa_80_truck_stop_barber_shop.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4381551/normal_5fe58b8116d76.pdfIn PDF document text
    • https://jatorogerujew.weebly.com/uploads/1/3/2/7/132710569/5650151.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/rizijubovapuk/79072330618.pdfIn PDF document text
    • https://s3.amazonaws.com/xakusineba/able2extract_latest_version_free.pdfIn PDF document text
    • https://s3.amazonaws.com/zuxadol/2569377946.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_off0000d926.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD926 5428 bytes
SHA-256: d39df26c2c4af89e984fd6926b39ebcda0f577767d21919aecb8df583f92720d
font_01_sfnt_off0000ebb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBB9 12164 bytes
SHA-256: cac81d396fca7accc3272ef85f39931084673f932e2dc76331036354a6eef8c9

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