Malicious PDF — malware analysis report

Static analysis result for SHA-256 bcb36f796b7d5824…

MALICIOUS

PDF

83.5 KB Created: 2021-02-21 09:58:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 5d430e522aa24f5daac07077d52a3967 SHA-1: 556aebd23d554317680fdc259fe5b59b68168a3a SHA-256: bcb36f796b7d58241940d6fac5404739ef0c6cb53f1cb0d7dd2c70bae4bb3ab1
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with a critical heuristic identifying it as a link farm. One prominent URL, 'https://leonvi.ru/strik?utm_term=approaches+and+methods+in+language+teaching+3rd+edition+free+download', suggests a lure for a free book download. ClamAV detection and ML classification strongly indicate malicious intent, likely related to phishing or malware distribution.

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://leonvi.ru/strik?utm_term=approaches+and+methods+in+language+teaching+3rd+edition+free+download PDF link annotation
    • https://cdn.sqhk.co/melalisopapu/Xj5hdQp/furniture_mod_for_minecraft_pe_1._12._0.pdfIn PDF document text
    • https://xibijogoxedugo.weebly.com/uploads/1/3/4/6/134662411/bilut_pezizefelep_joguvunoxufi_zimokarol.pdfIn PDF document text
    • https://cdn.sqhk.co/futevanu/hgtgdib/spinner_blade_ion_review.pdfIn PDF document text
    • https://cdn.sqhk.co/tirazirevemu/mghSgfj/hair_course_nz.pdfIn PDF document text
    • https://pesadoxemanuz.weebly.com/uploads/1/3/4/8/134852899/letowonunub.pdfIn PDF document text
    • https://cdn.sqhk.co/suxavawudomo/gezLjhB/89665606670.pdfIn PDF document text
    • https://cdn.sqhk.co/pulizojiwim/lRMRcig/super_smash_bros_clash_romsmania.pdfIn PDF document text
    • https://xepinepuro.weebly.com/uploads/1/3/0/9/130969238/godukelemuje.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/gadumagabusodel/aspen_plus_user_guide.pdfIn PDF document text
    • http://vaguxupinirulop.epizy.com/humptulips_river_fishing_report.pdfIn PDF document text
    • https://s3.amazonaws.com/lixuduwonifa/50715980986.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_off00010517.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10517 5812 bytes
SHA-256: c4e89296dd1fe32ad80855e10f06291b6971380d761d034490bf55e7dfae426c
font_01_sfnt_off000118ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118CA 12616 bytes
SHA-256: bdefd4c323c6d91880f18e1a3c8edd2e59435a5c720171500290b1f86443a90b

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