Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1e8b6622b9d7d14…

MALICIOUS

PDF

75.0 KB Created: 2021-01-23 00:27:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 2ce7f59dad27d400ebeb70e8ebaca18a SHA-1: 1639db65a9ec19bead11cd55c968c7cd95cac3d0 SHA-256: d1e8b6622b9d7d14371e0a92a3dac300c3f1a26438753caa54468e89dcfe3c85
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it contains a link farm with numerous external URLs hosted on disposable domains, suggesting a phishing or malware distribution scheme. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attempt to redirect users to malicious content.

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
  • 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.
  • 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://trafffe.ru/123?utm_term=eggless+chocolate+mousse+with+gelatin PDF link annotation
    • https://seporarutigofu.weebly.com/uploads/1/3/2/7/132741198/tidarogaro.pdfIn PDF document text
    • https://wisiwojapano.weebly.com/uploads/1/3/4/8/134896472/80ca39982ec.pdfIn PDF document text
    • https://jigibomafife.weebly.com/uploads/1/3/0/7/130738667/2645062.pdfIn PDF document text
    • https://site-1222001.mozfiles.com/files/1222001/company_logo_design_ai_free.pdfIn PDF document text
    • https://site-1177722.mozfiles.com/files/1177722/tebizufozewabekuvebabos.pdfIn PDF document text
    • https://site-1178683.mozfiles.com/files/1178683/bofevisirujukaga.pdfIn PDF document text
    • https://site-1199632.mozfiles.com/files/1199632/zokaxanan.pdfIn PDF document text
    • https://bewokeramubi.weebly.com/uploads/1/3/1/6/131636949/cc976acfeb19d.pdfIn PDF document text
    • https://site-1166680.mozfiles.com/files/1166680/most_anticipated_android_games_2020.pdfIn PDF document text
    • https://geguxawuxereko.weebly.com/uploads/1/3/1/3/131379712/9f4dd77.pdfIn PDF document text
    • https://dazuvekojuj.weebly.com/uploads/1/3/4/8/134863877/90294b4ce.pdfIn PDF document text
    • https://jebelobuf.weebly.com/uploads/1/3/1/4/131452997/ccccff.pdfIn PDF document text
    • https://site-1194674.mozfiles.com/files/1194674/41663729728.pdfIn PDF document text
    • https://sufudoni.weebly.com/uploads/1/3/4/8/134853368/xupizovoruwa-firarubewutitop-fegumuga-petuwowulax.pdfIn PDF document text
    • https://kevulukopefot.weebly.com/uploads/1/3/1/4/131453006/9062de656bf892.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000df99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF99 5168 bytes
SHA-256: 502108c8fb17dee27979ab3831a843d78a48ff61864462700161d26c1920783d
font_01_sfnt_off0000f11c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF11C 1800 bytes
SHA-256: daad3f347a4f42f432ee9983e619a7c063e36761dba5934b469418034847e28e
font_02_sfnt_off0000f9aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9AA 10740 bytes
SHA-256: 583ffc0e3a6c1ac5868e2cfe0bc72dd37e2131bb6b1841e5ac6ae63d05906108

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