Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6856657c374ec0c…

MALICIOUS

PDF

77.3 KB Created: 2021-02-26 11:14:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 3c1d4b0f2c28ccec1ff5903b968b20f5 SHA-1: dddab0f2706dcf6e180b43aa8b291f833270dea2 SHA-256: c6856657c374ec0c876a7affac6c4884a181e0bc1a919c44a1f0ae2ba4854c1e
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm designed to redirect users to potentially malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and extensive link farm are indicative of an attempt to exploit users through indirect means, possibly involving embedded JavaScript or other exploit vectors.

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://dafemum.ru/award?keyword=10+day+smoothie+cleanse+pdf+free PDF link annotation
    • http://legendarycraft.ru/wedubovjyeq0.pdfIn PDF document text
    • https://gozerezujokosas.weebly.com/uploads/1/3/4/8/134856803/vezozomuxezuka-kitet.pdfIn PDF document text
    • https://safasisi.weebly.com/uploads/1/3/4/4/134472516/zujerixewewu.pdfIn PDF document text
    • https://cdn.sqhk.co/duwokarewesu/ggfgjpE/killer_bean_unleashed_movie_download.pdfIn PDF document text
    • https://kirenokasanav.weebly.com/uploads/1/3/4/4/134445236/kabunotuzaw_purubizunix_xekaw.pdfIn PDF document text
    • https://litepuvib.weebly.com/uploads/1/3/4/7/134741427/2086691.pdfIn PDF document text
    • http://buytoday.cc/pexawipuxesazafajawu5cn5c.pdfIn PDF document text
    • https://jajadonafusava.weebly.com/uploads/1/3/4/0/134040597/gelozelenamuji.pdfIn PDF document text
    • https://naxofezuwu.weebly.com/uploads/1/3/5/3/135396878/nekubupudokakot.pdfIn PDF document text
    • https://xufujakuzizam.weebly.com/uploads/1/3/5/3/135315974/febitukigago.pdfIn PDF document text
    • https://xuvakaxatal.weebly.com/uploads/1/3/1/0/131070170/sutolofilunewa-tupukom-talibezumidu.pdfIn PDF document text
    • http://damvglaz2.xyz/kausalitas_dalam_sejaraht5r4b.pdfIn PDF document text
    • https://tupodoki.weebly.com/uploads/1/3/0/7/130776149/bca742.pdfIn PDF document text
    • https://cdn.sqhk.co/fewibefanid/QRDidib/family_mysteries_poisonous_promises_guide.pdfIn PDF document text
    • https://cdn.sqhk.co/furigelo/ephcggZ/ac_dc_ampere_meter_price_in_pakistan.pdfIn PDF document text
    • https://cdn.sqhk.co/goluxewimabu/Le42ic1/high_school_texas_baseball_scores.pdfIn PDF document text
    • https://jetosiwer.weebly.com/uploads/1/3/4/7/134767378/f38e4295258fd.pdfIn PDF document text
    • https://cdn.sqhk.co/kifuzopeko/jhdHI5t/absorption_spectroscopy_graphene.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF68 5596 bytes
SHA-256: 8db207443b0055f7a5fd3454335cff102014b2e87e91a1115785fd2cadeae6c9
font_01_sfnt_off00010257.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10257 10856 bytes
SHA-256: e0bf829050752cbf99e0df5eedacbd28a47f93a386528150036cbd48eeaafc95

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