Malicious PDF — malware analysis report

Static analysis result for SHA-256 78cff7b05d4b1a92…

MALICIOUS

PDF

70.8 KB Created: 2021-02-17 18:17:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: 1b238c3c6f60febee540fcedff9fdd60 SHA-1: ce802a028bc14efcc254e6379c57df2dd0358875 SHA-256: 78cff7b05d4b1a924c0239212fe8b6801428e81a9d6fd0dc16886930ff7f8842
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by multiple heuristics and an ML classifier, with ClamAV detecting it as a phishing trojan. It functions as a link farm, containing numerous external URLs pointing to other PDF files hosted on various domains, many of which appear to be disposable. The primary purpose seems to be SEO manipulation or distributing further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • 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://seumenha.ru/wix?keyword=my+losing+season+pdf PDF link annotation
    • https://turetufifej.weebly.com/uploads/1/3/4/5/134500159/f42e8714b40.pdfIn PDF document text
    • http://sesalon.xyz/good_luck_chuck_movie_in_480psqnhk.pdfIn PDF document text
    • https://nebemono.weebly.com/uploads/1/3/4/3/134331812/7098063.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500208/normal_600bb285a0768.pdfIn PDF document text
    • https://paxituzupinemof.weebly.com/uploads/1/3/5/3/135303349/kovur-tuzavuvup.pdfIn PDF document text
    • http://worldhold.online/8276797699lgf0y.pdfIn PDF document text
    • https://metiledozixav.weebly.com/uploads/1/3/1/1/131164016/6914575.pdfIn PDF document text
    • https://taretowixulu.weebly.com/uploads/1/3/1/0/131070971/2741950.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4427781/normal_5fcd425de1c0a.pdfIn PDF document text
    • https://lirujisigibat.weebly.com/uploads/1/3/0/8/130874608/wuwebiziziketisuligu.pdfIn PDF document text
    • https://rexawalifutox.weebly.com/uploads/1/3/4/4/134458468/bojodowapem.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481278/normal_6021a4bac73b1.pdfIn PDF document text
    • https://xevibobi.weebly.com/uploads/1/3/4/6/134683071/af8f828052e60.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_off0000d868.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD868 5220 bytes
SHA-256: 16b8ce459624ecff152dc874d1ffe207cd3535c6c46751f2ff233019ecbdfcda
font_01_sfnt_off0000ea5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA5C 10828 bytes
SHA-256: 3e99bfdc365f1aad9afa4c76c75e0e8157eb58b509b96fc7a203648f0e7e9be9

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