Malicious PDF — malware analysis report

Static analysis result for SHA-256 cff61253b6941949…

MALICIOUS

PDF

65.9 KB Created: 2021-01-04 00:42:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 129993a67f11c91bc2150b636081599c SHA-1: 8dc7111ed1635f697a06471b653f23ecfcd9843e SHA-256: cff61253b69419490cd7bcb31a65fdd446c28d2421a67ecf22f47e6004faffa9
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 numerous external links, identified as a link farm, and is flagged by ML classifiers and ClamAV as malicious. The embedded content, though heavily obfuscated, suggests a lure related to song downloads, which is a common tactic for phishing or distributing malware. The presence of multiple external URLs indicates an attempt to redirect the user to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://traffking.ru/aws?utm_term=agent+vinod+full+song++320kbps PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4368477/normal_5fc8164b00035.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384316/normal_5fb67ee139511.pdfIn PDF document text
    • https://cdn.sqhk.co/karapazepot/fYdgeYl/zopolinipefuzetokawarefok.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469106/normal_5faa1a11b3400.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420224/normal_5f9e0b8b63aca.pdfIn PDF document text
    • https://wamexololizod.weebly.com/uploads/1/3/2/7/132712163/salugin.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4428078/normal_5fad3d6846bc8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475571/normal_5fb733c8d6df2.pdfIn PDF document text
    • https://cdn.sqhk.co/vujalenan/apjjici/fizoto.pdfIn PDF document text
    • https://wavadubo.weebly.com/uploads/1/3/0/7/130775728/c37e0a38c8e5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383917/normal_5f8cb6b2862bb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459059/normal_5fe3d8e694e4f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4492880/normal_5fb57a7ef283d.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_off0000c2c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2C3 5596 bytes
SHA-256: 2d1ac9e37e10d395f6b918079ed6aa3345717db40b4cdb15c544d1d4ea68e5d8
font_01_sfnt_off0000d5fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5FA 11196 bytes
SHA-256: f60638368f3d2e8cdfc51bfac59d84da8a1be15bd03ed70a363e47e5789a54c1

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