Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e4d5ce041754752…

MALICIOUS

PDF

78.0 KB Created: 2021-03-03 16:17:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 753aff78a049defbdeb1492879df9f02 SHA-1: c5aaf11feeb4632b0c9ce281e0ebe34b3d85bccf SHA-256: 8e4d5ce04175475296dff852315938d0e2dca7ebc194fa032d858ee6853ae62a
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as malicious, including a critical finding for a mass external link farm. The presence of numerous external URLs, including one pointing to a potentially malicious domain ('bologen.ru'), suggests an attempt to redirect users to malicious content or phishing sites. The ClamAV detection and ML classifier further support its malicious nature, likely as a phishing or trojan delivery mechanism.

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
  • 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.
  • 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://bologen.ru/strik?utm_term=how+to+get+a+service+dog+military PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4380543/normal_5fec13e033cf2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4392857/normal_5fdf30dbe4936.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467577/normal_602ce50a975fd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4483870/normal_5fcac8ff9a489.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393179/normal_5fe767f413e3a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489615/normal_5fe5ba43ed993.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4504641/normal_5fd2d104c1b9e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403804/normal_603a1e7d150fc.pdfIn PDF document text
    • http://gejejasofubi.mywebcommunity.org/que_la_fotografia_aerea.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393506/normal_5ffad33a4b65f.pdfIn PDF document text
    • https://zipobirin.weebly.com/uploads/1/3/5/3/135386694/5558f5bc58a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4402710/normal_5fee33587d1af.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413702/normal_6023e65435ffe.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4473616/normal_5fe570466bb89.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/gizonukorad/xenolo.pdfIn PDF document text
    • http://tifavamifikas.myartsonline.com/johnson_40_hp_outboard_motor_for_sale.pdfIn PDF document text
    • https://s3.amazonaws.com/lebaxa/instagram_for_windows_7_desktop.pdfIn PDF document text
    • https://s3.amazonaws.com/mubemutolewe/zawuwavirosixovupev.pdfIn PDF document text
    • http://bopisumeku.atwebpages.com/16777876028.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_off0000f27b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF27B 5472 bytes
SHA-256: 3e9a63c589c0bb19b4755d6943a2c601bf0c88ec88810a207f40172b05739d31
font_01_sfnt_off0001051f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1051F 11172 bytes
SHA-256: f4cff9f57ac2ee2bd155950cc1fc05479323acd4fc52c38531a3b6ca4a32ed0f

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