Malicious PDF — malware analysis report

Static analysis result for SHA-256 dadb5fdf65bfe1fc…

MALICIOUS

PDF

84.3 KB Created: 2021-05-20 14:46:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 9f1c9709ddd19720daadf0311ad1cd91 SHA-1: 20db0657055b4bb7065b8882a32ee56824ca9267 SHA-256: dadb5fdf65bfe1fceac1a3233092eea49395b9ac671969d47a84ee4f6eca1a63
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to other PDF files, suggesting a link farm or SEO poisoning attempt. One of the primary external links, 'https://bologen.ru/strik?utm_term=fundraising+goal+thermometer+template', indicates a lure to a malicious website. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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=fundraising+goal+thermometer+template PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4418579/normal_5fe4edc51937d.pdfIn PDF document text
    • https://nokajadum.weebly.com/uploads/1/3/4/8/134887388/6903564.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4469863/normal_5ffb592db3b23.pdfIn PDF document text
    • https://dugigoje.weebly.com/uploads/1/3/4/7/134754128/fedadeginolu.pdfIn PDF document text
    • https://xereritotof.weebly.com/uploads/1/3/1/0/131070340/jitexulaga.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4496816/normal_6002109d99803.pdfIn PDF document text
    • https://jivimukik.weebly.com/uploads/1/3/0/7/130775904/sowor.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378856/normal_602f6198e55cf.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4390383/normal_5fc6ce7e91e2f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387419/normal_5fdec8d8ec15c.pdfIn PDF document text
    • https://toxupuxuforiri.weebly.com/uploads/1/3/5/9/135966975/dd28fec4ae356.pdfIn PDF document text
    • https://vaxuzumop.weebly.com/uploads/1/3/4/8/134870956/fobamosigow.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374024/normal_601807f81274c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387816/normal_600dd7c7e46c8.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/legapatatezisa/26150708817.pdfIn PDF document text
    • https://s3.amazonaws.com/jiwisi/15236221009.pdfIn PDF document text
    • https://s3.amazonaws.com/kexamoxusinixu/wurigegire.pdfIn PDF document text
    • https://s3.amazonaws.com/gebukil/85509699765.pdfIn PDF document text
    • https://s3.amazonaws.com/tesodagiwor/rcog_guidelines_for_fibroid_uterus.pdfIn PDF document text
    • https://s3.amazonaws.com/niwotipugonuvoz/pathfinder_carrion_crown_haunting_of_harrowstone.pdfIn PDF document text
    • https://s3.amazonaws.com/rodiligarexo/xemewovenivot.pdfIn PDF document text
    • https://s3.amazonaws.com/wefadep/xonuw.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_off00010917.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10917 5328 bytes
SHA-256: 11f533bea5fae42512a521a9921e5ae36adb2f46f24170e83e100ebd9f910e4c
font_01_sfnt_off00011b09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B09 12212 bytes
SHA-256: c7b6fb10151b40a22c07b2c8695c46f25525fb8d6ae15671d1e3d20cc889c70f

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