Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf865adee128c639…

MALICIOUS

PDF

76.8 KB Created: 2021-01-06 04:40:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: a8a1cbb86d6b6e07adc9ae50dede1005 SHA-1: a4a87bfecb96a5001edd302874ffdfb11576e504 SHA-256: bf865adee128c63916a12e97b76a8ce36ab78dc2e0656f823861929171e6f731
244 Risk Score

Malware Insights

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

This PDF file contains a large number of embedded links, many of which point to disposable hosting and redirect to malicious infrastructure. The primary malicious URL identified is https://cctraff.ru/aws?utm_term=virgo+and+cancer+friendship+yahoo+answers, which is flagged as a malicious redirector. The document's structure and content suggest it is part of a link farm designed to drive traffic to malicious sites, likely for phishing or malware distribution.

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
  • 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.
  • 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://cctraff.ru/aws?utm_term=virgo+and+cancer+friendship+yahoo+answers In PDF document text
    • https://static.s123-cdn-static.com/uploads/4371495/normal_5fe5ef105971d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4415739/normal_5fce4f5c8c52c.pdfIn PDF document text
    • https://vufizirisabewi.weebly.com/uploads/1/3/4/4/134443644/mogomojadapur.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413002/normal_5fab5b5676478.pdfIn PDF document text
    • https://lanedipeluta.weebly.com/uploads/1/3/4/6/134666686/679b2897f8d9803.pdfIn PDF document text
    • https://tevupiju.weebly.com/uploads/1/3/4/8/134865653/jusafurekuk-piwon-voregoneruw.pdfIn PDF document text
    • https://ponopuxebi.weebly.com/uploads/1/3/4/3/134365602/1445314.pdfIn PDF document text
    • https://velizixevapejaj.weebly.com/uploads/1/3/4/3/134376636/tamobatiwin-mekitix-nudejob-vuxodap.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420930/normal_5fd2e1cec2be1.pdfIn PDF document text
    • https://wumibopoz.weebly.com/uploads/1/3/4/5/134511789/bikobemutu-satamaje.pdfIn PDF document text
    • https://labekefetimobu.weebly.com/uploads/1/3/0/7/130739294/wifixamebilim_xepopi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4391000/normal_5fecce541a3f8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374374/normal_5f8f275332e37.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387242/normal_5fdbcd405dc8a.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/vovabagubajegeb/princess_diana_wedding_year.pdfIn PDF document text
    • https://s3.amazonaws.com/kozewuposoridil/nuxigopogixepa.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_off0000ee5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE5D 5544 bytes
SHA-256: 180478e9e784212a64de0491f3192e289d589fd9468cc83282713d58d4a9b01a
font_01_sfnt_off00010156.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10156 10708 bytes
SHA-256: 91e250146e8702a3f171e84b4a41a9e4be2bcf86bd99531c05f8109475fe8898

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