Malicious PDF — malware analysis report

Static analysis result for SHA-256 bddd94cd4e273b25…

MALICIOUS

PDF

89.0 KB Created: 2021-02-22 04:34:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 8087891149ef83a5b4586ed4d602f7e2 SHA-1: 56c8b615a08427ec2ee3de8d07d3732852bda9b4 SHA-256: bddd94cd4e273b25f2ba98c985d8101426d1d8f7755b7dfe534487959069209d
126 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on disposable domains and utilize UTM parameters, indicating a link farm designed for SEO manipulation or phishing. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a social engineering attack aiming to redirect users to malicious content.

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 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.
  • 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://leonvi.ru/strik?utm_term=dungeons+and+dragons+pdf+player%2527s+handbook PDF link annotation
    • https://dukowitemodilel.weebly.com/uploads/1/3/5/3/135316140/6403706.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470535/normal_5fd709f9af9c1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476595/normal_6002b43b0459f.pdfIn PDF document text
    • https://giretalude.weebly.com/uploads/1/3/4/6/134677333/razulano.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380540/normal_60097ebbd68dc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470228/normal_5fcfaac29f2b9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471711/normal_602f837684d55.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/kevava/41931050261.pdfIn PDF document text
    • http://xilagerezob.epizy.com/thinking_for_a_change_worksheets.pdfIn PDF document text
    • http://zugoxovok.epizy.com/holidays_are_coming_piano_sheet_music.pdfIn PDF document text
    • https://s3.amazonaws.com/bubodeliza/ramatigikozu.pdfIn PDF document text
    • https://s3.amazonaws.com/bajapovogam/63533149821.pdfIn PDF document text
    • http://kifinuneniw.rf.gd/82902451363.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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010e6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E6A 5640 bytes
SHA-256: 51ca81bd89b6c04454b6c0634ee7b817260ec1a8666cb4431922e37b0f0e746d
font_01_sfnt_off000121a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121A9 11212 bytes
SHA-256: 6fab66e649c24600f4fb7e8d7c364010e5cbbd73103f01448fe3e66ac36d6a4b
font_02_sfnt_off000147e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x147E1 6084 bytes
SHA-256: 5c86a376815d6f0efe6cbb93564a647c509e09040777fb1c2d4e15ff73d7b350

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