Malicious PDF — malware analysis report

Static analysis result for SHA-256 0d0a3cb12cf8271f…

MALICIOUS

PDF

84.2 KB Created: 2021-02-20 08:33:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 6112bb545b8c591309a18beb00ac69e9 SHA-1: 272cd6f12accb30dd97ce2d6e3ef674c0a98e4c6 SHA-256: 0d0a3cb12cf8271f278a75e9dae424334548695f7d13c4cc0505c0cbf5b577d1
284 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, many of which point to disposable hosting and redirect to malicious infrastructure like 'yafferge.ru'. The 'SE_REMOTE_SUPPORT_LURE' heuristic suggests the document attempts to trick users into installing remote support tools, which is a common tactic for malware delivery or credential theft. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • Remote-support tool lure high SE_REMOTE_SUPPORT_LURE
    Document instructs the user to install, open, or connect with a remote-support tool such as AnyDesk, TeamViewer, Quick Assist, or ScreenConnect — high-risk in an unsolicited document
  • 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.
  • 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://yafferge.ru/strik?utm_term=best+niv+bible+app+ios In PDF document text
    • https://static.s123-cdn-static.com/uploads/4404727/normal_5fffc66196ea1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4492257/normal_60144abf69652.pdfIn PDF document text
    • https://jurogewogil.weebly.com/uploads/1/3/4/3/134318518/5b3edb94.pdfIn PDF document text
    • https://vosovijuz.weebly.com/uploads/1/3/0/8/130813614/jinovuvunuk-xozeverez-furuwe-wixesutamek.pdfIn PDF document text
    • https://jewutejaj.weebly.com/uploads/1/3/1/0/131070173/91499fb2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393189/normal_5fec0fc1b7e40.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424024/normal_601444146fedb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458148/normal_6012321cd8a7f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369519/normal_601a6458c6fb0.pdfIn PDF document text
    • https://metifipiwe.weebly.com/uploads/1/3/1/1/131164131/f88be6ba9554d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480758/normal_601fef23c5221.pdfIn PDF document text
    • https://zoparidozuxeb.weebly.com/uploads/1/3/5/3/135390671/1007938485649.pdfIn PDF document text
    • https://telogedibosujo.weebly.com/uploads/1/3/1/4/131438044/muzewatawovuxuz.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/zunaduxa/reported_speech_in_spanish.pdfIn PDF document text
    • https://s3.amazonaws.com/bisazabe/xopujomusoke.pdfIn PDF document text
    • https://s3.amazonaws.com/vibuvomomuv/vajevaguz.pdfIn PDF document text
    • http://fikexole.rf.gd/dilaw.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_off00010df8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DF8 4968 bytes
SHA-256: 4ceca0c6d118481937a04ff4dbf5f36ab147106f3c2d016f8d85f6f0bd8a0008
font_01_sfnt_off00011ef5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EF5 10780 bytes
SHA-256: 47a888d8b9e331819fbf96c48da46f6b1e7b8f45cbf624b6ce947296df5735e2

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