Malicious PDF — malware analysis report

Static analysis result for SHA-256 6de0922498e755f8…

MALICIOUS

PDF

79.8 KB Created: 2021-02-20 10:43:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: b5488bd92d61078acc63989b192a4a4e SHA-1: decddc0723182387675db828bc4eaf2db8724afd SHA-256: 6de0922498e755f8760b2c21e524076b65d7b75c97bbce95e590d663ca7da284
186 Risk Score

Malware Insights

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

The PDF file exhibits characteristics of a malicious SEO link farm, containing numerous external links designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. The presence of multiple external links, including one pointing to a potentially malicious domain, suggests an attempt to lead the user to a compromised or malicious site.

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/aws?utm_term=millionaire+next+door+book+pdf PDF link annotation
    • https://cdn.sqhk.co/wopidevepip/bielRjb/rumaxumalewekusoxe.pdfIn PDF document text
    • https://tawuvumiru.weebly.com/uploads/1/3/5/3/135326103/5682697.pdfIn PDF document text
    • https://fevebelok.weebly.com/uploads/1/3/4/0/134012800/8541672.pdfIn PDF document text
    • https://voberugupov.weebly.com/uploads/1/3/4/4/134496708/voxunofulas-ninibanex-zilafazuxupu-vojofele.pdfIn PDF document text
    • https://cdn.sqhk.co/ruduligived/1Qc9lZr/malayalam_fonts_download_for_windows_10.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450003/normal_601280d7cb452.pdfIn PDF document text
    • https://gujojiri.weebly.com/uploads/1/3/4/4/134434224/fidibabatape-kilimurasav-worobuzesu-lezit.pdfIn PDF document text
    • https://jovuximunises.weebly.com/uploads/1/3/0/8/130814448/banubiper.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/kegubinefuda/mamidamubifeja.pdfIn PDF document text
    • http://gidubivej.rf.gd/28433221006.pdfIn PDF document text
    • https://s3.amazonaws.com/tugumeb/dojon.pdfIn PDF document text
    • https://s3.amazonaws.com/gurupixabogivaz/3263982574.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_off0000fc5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC5B 5132 bytes
SHA-256: cb495a0d1eedf0033a16cf56850442522144efbeb0cd8251463ebb22469ff3e8
font_01_sfnt_off00010ded.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DED 10632 bytes
SHA-256: 757c040d0f7a1ff1524733d4825a01bba77b769d1b0fd71c349cc855c951a737

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