Malicious PDF — malware analysis report

Static analysis result for SHA-256 159991befa53f28a…

MALICIOUS

PDF

72.5 KB Created: 2021-02-15 20:20:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: bef1a51f508e2412a548da0ec95fb418 SHA-1: 21ed9bdfbf0b157a99444cd337d4b06234315786 SHA-256: 159991befa53f28aaf410cd096138139a2f20e4896a1fd53581d31708610ab93
186 Risk Score

Malware Insights

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

This PDF document is classified as malicious by ML and ClamAV, and exhibits characteristics of a link farm. It contains numerous external links, many hosted on disposable domains, suggesting an attempt to redirect users to potentially malicious content or phishing sites. The document body, though heavily obfuscated, contains metadata indicating it was generated by wkhtmltopdf, and the presence of external URIs and link farm heuristics strongly suggests a malicious intent to drive traffic to external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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/123?utm_term=food+chart+for+gerd PDF link annotation
    • https://bovejivisesuja.weebly.com/uploads/1/3/1/3/131384116/dekefurid.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403418/normal_60299b5a5e486.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485693/normal_602586abe2abf.pdfIn PDF document text
    • https://telogedibosujo.weebly.com/uploads/1/3/1/4/131438044/silarewuzapose-jegazikelos-punizisixudoxab-fepixegox.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388169/normal_600484ed99dac.pdfIn PDF document text
    • https://boniwivo.weebly.com/uploads/1/3/2/6/132683051/4932574.pdfIn PDF document text
    • https://xodajozazav.weebly.com/uploads/1/3/5/3/135305433/fa6ba2aeb9cb.pdfIn PDF document text
    • https://cdn.sqhk.co/rorezina/6gfrjak/kejafewekofo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389366/normal_6029e93ac4a8e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4482009/normal_5fe3bb28137de.pdfIn PDF document text
    • https://zalivibutadugaf.weebly.com/uploads/1/3/5/3/135391941/madugawe.pdfIn PDF document text
    • https://doruxajowivabog.weebly.com/uploads/1/3/4/8/134870444/zuduvuf.pdfIn PDF document text
    • https://jeduwenerapowi.weebly.com/uploads/1/3/4/6/134678879/fapebibuzuwu-madakabepof-nikazexixazelav.pdfIn PDF document text
    • https://lekopejener.weebly.com/uploads/1/3/5/3/135323345/805505.pdfIn PDF document text
    • https://benodamefeju.weebly.com/uploads/1/3/5/3/135346815/tuzil_tivuko.pdfIn PDF document text
    • https://duxegebipuvakij.weebly.com/uploads/1/3/4/0/134095857/jugawuv_sirunagojiwaw.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/livivuvuwugeb/video_maker_software_free_windows_10.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_off0000e14f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE14F 5028 bytes
SHA-256: 72e34b25bf23535a051d1ca9d4257c7139f4a7ebda7523bf6bf91c74e294a326
font_01_sfnt_off0000f265.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF265 10032 bytes
SHA-256: ccb12786211ba07b1b803dce93adab707f3108689d9147ece443908805559f30

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