Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc8c5bd5ee6ccf4f…

MALICIOUS

PDF

74.5 KB Created: 2021-02-11 23:42:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 46de9012968c24712778c90896d70908 SHA-1: d3d0a95b49806685a4a98dfaa63b2f2fa8ca44f4 SHA-256: bc8c5bd5ee6ccf4f7892a6243cadf4c2a49522521b00b111781c1918b1821027
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or phishing attempt. The ClamAV detection and ML classifier also indicate maliciousness. While no scripts were explicitly extracted, the presence of numerous external URLs points towards an attempt to redirect users to potentially malicious sites.

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://bologen.ru/123?utm_term=ghost+commander+donate+apk PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4408188/normal_5ffce5bf7fbff.pdfIn PDF document text
    • https://cdn.sqhk.co/sinupupuzaxa/hfnhigi/90104545583.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413117/normal_5fdedfe2373ea.pdfIn PDF document text
    • https://cdn.sqhk.co/lafuwexale/hjmjyUg/free_app_to_make_music_video_with_pictures.pdfIn PDF document text
    • https://cdn.sqhk.co/nemuvefik/kfWifP0/granny_square_afghan_coat_pattern.pdfIn PDF document text
    • https://cdn.sqhk.co/gukugifixija/uZijjcK/delifemata.pdfIn PDF document text
    • https://cdn.sqhk.co/wimedizi/gcD7pNH/jazewiwine.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379856/normal_600f112361fc0.pdfIn PDF document text
    • https://sutuvawubu.weebly.com/uploads/1/3/6/0/136055635/824bf.pdfIn PDF document text
    • https://cdn.sqhk.co/naxetimi/igiijjT/33457033236.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426072/normal_6001e85902001.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4424341/normal_600073b0d7bb0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489587/normal_60121f34dba68.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425209/normal_60254dbe9f504.pdfIn PDF document text
    • https://cdn.sqhk.co/koxopumo/jficuia/war_conqueror_4_hack.pdfIn PDF document text
    • https://cdn.sqhk.co/xidatelo/2wMJkAG/gotujixufosajugibetopaj.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zawemitop.epizy.com/baby_names_meaning_god_answers_prayers.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_off0000df20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF20 5376 bytes
SHA-256: 39350aa519aa2cc377f7bfa2527c3d35d03ef52236ff2e66db6ec94c016dcc2c
font_01_sfnt_off0000f13c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF13C 14008 bytes
SHA-256: a9fd3e96f8467c4c4eddcd8cb659c90be62d2a9df0231f739221d9df17366b97

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