Malicious PDF — malware analysis report

Static analysis result for SHA-256 9cb47a48d6e5b69c…

MALICIOUS

PDF

73.9 KB Created: 2021-02-21 21:03:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: d2fd58defb0acd82cbeb5f064ad40b02 SHA-1: d934b2028160f14efa4e9783f440ca54251cf541 SHA-256: 9cb47a48d6e5b69c0455ba6cc098e312074768842e77408d889c1b966300c4e1
214 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, yafferge.ru, which is likely used to host phishing or scam content. The document body, though heavily obfuscated, appears to be a lure related to teeth whitening. The presence of numerous external PDF links, many pointing to S3 buckets and Weebly, suggests a link farm or SEO poisoning attempt to distribute malicious content.

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
  • 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.
  • 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=why+are+my+teeth+yellow+in+the+morning+and+white+at+night In PDF document text
    • https://nozirurabi.weebly.com/uploads/1/3/0/7/130738896/2ce379f6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4488572/normal_5fc593739e5e6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4411923/normal_60040049e7ea2.pdfIn PDF document text
    • https://vizegibog.weebly.com/uploads/1/3/4/4/134458583/sagonakanig_xulixolov_mojotosixewe.pdfIn PDF document text
    • http://dojimifarekajiw.iblogger.org/chorus_from_judas_maccabaeus_piano_sheet_music.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4498392/normal_5fd8ad8cc4b24.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4418188/normal_5ff34fa0d902b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379841/normal_600ff5a874ad2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4499958/normal_5fd322f254aeb.pdfIn PDF document text
    • https://tosofeguwus.weebly.com/uploads/1/3/4/3/134321705/bafirerifawojebasosu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485005/normal_5feb853ca69dc.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/tokatefozude/well_noted_formal.pdfIn PDF document text
    • https://s3.amazonaws.com/dejazuvorira/besixalasadeki.pdfIn PDF document text
    • http://werewipabelud.rf.gd/capitol_theatre_performances.pdfIn PDF document text
    • https://s3.amazonaws.com/gezizefefififa/riwuj.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_off0000e3b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3B7 5268 bytes
SHA-256: f405c5a0b622204cc4a8f2b20bd79b21dfb92935772fb95e02ccd43afda0f0cf
font_01_sfnt_off0000f591.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF591 10072 bytes
SHA-256: b2507b995ed1ff7ddfc2e8a2cadc3f3521adc0ba2a11d8fb99494f52c32205a5

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