Malicious PDF — malware analysis report

Static analysis result for SHA-256 998a4daffbbd2920…

MALICIOUS

PDF

72.1 KB Created: 2021-01-24 20:10:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: 3d642a7c2cf97ed622cfeb8b9f976a20 SHA-1: d5b0896a8140adac42f47eb86e3326984b84d62e SHA-256: 998a4daffbbd29200398df3d697410185d85912a148c368ee3a12ebd9f8e36e5
156 Risk Score

Malware Insights

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

The PDF file contains a mass of external links, many of which point to other PDF files, suggesting a link farm or phishing operation. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as a phishing trojan. While no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of a malicious campaign, likely involving the distribution of further malware or phishing content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://trafficel.ru/123?utm_term=warhammer+fantasy+9th+edition+rulebook+pdf PDF link annotation
    • https://cdn.sqhk.co/leluforeref/ghOX5qb/cardi_b_noises_download.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409256/normal_5fdbb740a7d44.pdfIn PDF document text
    • http://cosmeteca.com/crash_car_driving_2019_usafcylv.pdfIn PDF document text
    • https://cdn.sqhk.co/gufezitaxato/thiPijI/popobovibetowofu.pdfIn PDF document text
    • http://front-glass.website/786625492249g0q2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455907/normal_5fd67ee95355a.pdfIn PDF document text
    • https://lilikegemuvil.weebly.com/uploads/1/3/1/3/131398424/5775463.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374708/normal_5fe294836b75a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408004/normal_5fe2aefa6f4ee.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411229/normal_5fda3f09019e9.pdfIn PDF document text
    • https://cdn.sqhk.co/kawinojos/UwsJnig/iron_punch_mod_apk_android_1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372361/normal_5fe6eaf4c7e2a.pdfIn PDF document text
    • https://gawakugoful.weebly.com/uploads/1/3/4/7/134757428/5335753.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_off0000dca4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCA4 5756 bytes
SHA-256: 2e0b68366fa3929dc80d67d1f0c58c5b76d559f638ecd210a366ea3ab22d89c8
font_01_sfnt_off0000f016.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF016 10316 bytes
SHA-256: b622a7292dda7631b61c06b455a72a43c3e1c5a7249cd01278b49799de6e83fb

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