Malicious PDF — malware analysis report

Static analysis result for SHA-256 201f172279add9e6…

MALICIOUS

PDF

83.8 KB Created: 2021-02-17 21:41:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: d1fb7e20847bef9b397be01c42e52a90 SHA-1: 7e198420b2c521f229b2471bcc8d19ab7f85e7f4 SHA-256: 201f172279add9e66ae6e4487372bd7126ca258250625f0c27155a15d0ce4258
186 Risk Score

Malware Insights

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

This PDF file is identified as malicious by multiple heuristics and a machine learning classifier, with ClamAV detecting it as a phishing trojan. It functions as a link farm, directing users to numerous external PDF files hosted on disposable domains, likely as part of a phishing or scam campaign. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, and the presence of embedded URLs indicates an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://jottigo.ru/strik?utm_term=best+novels+to+read+for+beginners PDF link annotation
    • https://kaxobemux.weebly.com/uploads/1/3/4/6/134676595/taguwe.pdfIn PDF document text
    • https://bomexufimewaw.weebly.com/uploads/1/3/4/5/134517434/697679.pdfIn PDF document text
    • https://cdn.sqhk.co/kogujipubap/sh3vrib/cake_maker_game_download_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/wemopizajazo/ThjhanL/kewupoketugapi.pdfIn PDF document text
    • https://nudiwosesi.weebly.com/uploads/1/3/4/3/134317077/tisovakikobufob-xulavimubo.pdfIn PDF document text
    • https://goxapuvuf.weebly.com/uploads/1/3/2/7/132741714/mutaxulududilef-toxoduxo.pdfIn PDF document text
    • https://wegotogad.weebly.com/uploads/1/3/4/3/134342574/balagikazav.pdfIn PDF document text
    • https://rezibaxuxemabu.weebly.com/uploads/1/3/1/4/131453555/fudogigomorok.pdfIn PDF document text
    • https://kiwakobomu.weebly.com/uploads/1/3/1/4/131482833/4321156.pdfIn PDF document text
    • https://cdn.sqhk.co/vekuniruf/RG3hdif/geometry_wars_4.pdfIn PDF document text
    • https://totijavefukaja.weebly.com/uploads/1/3/4/7/134705726/4734792.pdfIn PDF document text
    • https://cdn.sqhk.co/sobupepokor/boJibzw/waletenojo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://puloxivomavari.epizy.com/tifesovijejedulobenimes.pdfIn PDF document text
    • https://s3.amazonaws.com/difigomisosak/fresh_white_mask_sheet_review.pdfIn PDF document text
    • http://fivamoxopel.epizy.com/apple_bonjour_service_windows_10.pdfIn PDF document text
    • https://s3.amazonaws.com/posufij/movimiento_rectilineo_uniforme_acelerado_ejemplos_vida_cotidiana.pdfIn PDF document text
    • https://s3.amazonaws.com/juvetaso/filopenox.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_off00010bcc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BCC 5324 bytes
SHA-256: 2256ed301b51376c42317e79c102a0efc1c7a517be7b9385ca4cb86ebbbc274a
font_01_sfnt_off00011dff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DFF 10632 bytes
SHA-256: af40b6cdf238cf5389a2cc6f3db32e78781617e635d170e13343282e2b203cc7

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