Malicious PDF — malware analysis report

Static analysis result for SHA-256 7388a37e56bc3744…

MALICIOUS

PDF

78.9 KB Created: 2021-01-06 12:04:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 8cd1a28ebf7fa89b7238f84c71ed2876 SHA-1: 93d9a6bfc60936d5e018fc619ca11b296815694c SHA-256: 7388a37e56bc37447cb7cc85836c2bd28603daa49205199a890a31f6752145cc
206 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, specifically as a phishing trojan. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users. The presence of a 'Macro/content-enable lure' heuristic indicates the document likely prompts the user to enable content, a common tactic for malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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.
  • Macro/content-enable lure medium SE_ENABLE_LURE
    Document instructs the user to enable macros or editing — a common technique used by malware droppers to bypass Office macro security settings
  • 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://traffine.ru/aws?utm_term=l%2527+adequation+formation+emploi PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4389599/normal_5fb621b36aeaf.pdfIn PDF document text
    • https://zuwukozoxuwiged.weebly.com/uploads/1/3/4/7/134713444/1a2faecd2b9a33.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448986/normal_5fd88ca133aa4.pdfIn PDF document text
    • https://xefepalig.weebly.com/uploads/1/3/4/6/134679085/faf2de32e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4493602/normal_5fc1fa3d4d09e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384633/normal_5fd66097c4aef.pdfIn PDF document text
    • https://pepajodik.weebly.com/uploads/1/3/1/4/131453945/9472663.pdfIn PDF document text
    • https://kunimagim.weebly.com/uploads/1/3/4/6/134608209/9685885.pdfIn PDF document text
    • https://somotudodij.weebly.com/uploads/1/3/4/6/134699902/670603.pdfIn PDF document text
    • https://cdn.sqhk.co/rukefazox/a4x08jg/brick_game_pro_19._8._00.pdfIn PDF document text
    • https://cdn.sqhk.co/nivipanevi/ifJiaie/nujat.pdfIn PDF document text
    • https://cdn.sqhk.co/vujenibolo/hamihc3/idle_coffee_corp.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459479/normal_5fa519f260ddc.pdfIn PDF document text
    • https://kopomitesukov.weebly.com/uploads/1/3/1/4/131453216/3216507.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/muvojugejoxip/beach_buggy_racing_hacked_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/gifojuxaxeva/archetypal_psychology.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_off0000f87a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF87A 5108 bytes
SHA-256: 998bc35a4f6fa84fab6a3c221539531079a477908c74c314ff82f46daf163579
font_01_sfnt_off000109ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109CA 10816 bytes
SHA-256: 40bc2d93d1b00627c25119f1214825934700697d93501b100012abce32a6c8a6

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