Malicious PDF — malware analysis report

Static analysis result for SHA-256 8318238230f9b4d1…

MALICIOUS

PDF

75.5 KB Created: 2021-02-06 12:18:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: f98a55d5008b454ff618c867aa260dc4 SHA-1: 7264ead4b88aba90c44e2d7f807f16c2fc1caeb5 SHA-256: 8318238230f9b4d17fb4387c8b205b4dde639a1f18efa3ef80f5e8322dc1bc9f
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body, though heavily corrupted, suggests a lure related to an 'Arduino project book'.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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://leonvi.ru/123?utm_term=arduino+project+book+english PDF link annotation
    • https://cdn.sqhk.co/zerurukoraju/1dfjitA/13439652242.pdfIn PDF document text
    • https://xulozajewe.weebly.com/uploads/1/3/1/3/131384688/b42efa599.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477400/normal_6019143b81e2d.pdfIn PDF document text
    • http://pornbustyvids.com/dilokofijevuzuxuwadexaro50kb3.pdfIn PDF document text
    • http://fruits-summer.fun/mefesodigapexisajy406l.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4500200/normal_5fc5bf6695478.pdfIn PDF document text
    • https://serewutedirafam.weebly.com/uploads/1/3/5/3/135339767/8598241.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369911/normal_5fcc198044c06.pdfIn PDF document text
    • http://kuzamejeluwezik.22web.org/8948045978.pdfIn PDF document text
    • https://gomafaned.weebly.com/uploads/1/3/5/2/135296522/87d091016708.pdfIn PDF document text
    • http://chaptejvxz.fun/what_dog_breeds_have_pink_noses5l6qz.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4453333/normal_5fcd9d9bd75cb.pdfIn PDF document text
    • https://cdn.sqhk.co/vusopukov/h4jbiiX/17242271794.pdfIn PDF document text
    • http://lenudes.com/pacific_fire_vine_maplewnjip.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000eb74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB74 5392 bytes
SHA-256: 30228899f1b9cbbe2be2227eb07465348041fafad708da9383875d80160e18d3
font_01_sfnt_off0000fdcd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDCD 10220 bytes
SHA-256: 673d42bf5c91b8e38fb3f3bf58764853fa252f93a4ea5356fe16042a43bd927c

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