Malicious PDF — malware analysis report

Static analysis result for SHA-256 e33d4365a46dacf0…

MALICIOUS

PDF

66.7 KB Created: 2021-02-18 19:49:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: df85b341d41327e4a7e6820c0e072e2a SHA-1: 89cd9b56dfc4d8ef1d6cac95bdb6a9e024d95857 SHA-256: e33d4365a46dacf03c551674a0e27eff14f7149132d9d13bc021600daf1ca70e
126 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs pointing to external websites, suggesting a phishing or malware distribution scheme. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this by indicating the PDF is part of a link farm hosted on disposable domains, a common tactic for distributing malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://baarspo.ru/wix?keyword=eragon+pronunciation+guide PDF link annotation
    • https://vanewuzopawibo.weebly.com/uploads/1/3/0/8/130814706/gixuxodufunutav-zovesiduwutuvug-razugufo.pdfIn PDF document text
    • https://cdn.sqhk.co/jivumigen/dAix8Sj/video_maker_free_app_download.pdfIn PDF document text
    • https://cdn.sqhk.co/runetonorox/ifhdhgz/wujabunijalix.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480743/normal_60289cefd57fe.pdfIn PDF document text
    • https://fafevidelaxikez.weebly.com/uploads/1/3/4/4/134481631/dubefezuzafo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450337/normal_6005b3b573e28.pdfIn PDF document text
    • http://zetozofawa.22web.org/34064948575.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4424637/normal_5fcb104119525.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422631/normal_6017850366917.pdfIn PDF document text
    • https://cdn.sqhk.co/nexoratuxi/goftgiE/nba_2k20_locker_codes_generator_2020.pdfIn PDF document text
    • https://gerunujixode.weebly.com/uploads/1/3/1/6/131606408/7726940.pdfIn PDF document text
    • https://tutupofu.weebly.com/uploads/1/3/0/9/130968911/kumelarox-tejadalamufod.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4477910/normal_5fcb7bb5cc0ec.pdfIn PDF document text
    • http://muxusapefon.iblogger.org/69312715271.pdfIn PDF document text
    • https://fubalaxusagipun.weebly.com/uploads/1/3/4/1/134108832/103863.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/mibiwivanetuj/woof_brushing_boots_size_guide.pdfIn PDF document text
    • http://sitolomuku.epizy.com/anbe_anbe_movie_song_in_masstamilan.pdfIn PDF document text
    • http://saxowuwu.rf.gd/photoshop_cs5_crack_free.pdfIn PDF document text
    • https://s3.amazonaws.com/sesijesule/kakamega_county_map.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_off0000c976.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC976 4988 bytes
SHA-256: 16ec75672e2e335a984f115b77279f94981ee06b67baed9f2daae61d63f094ac
font_01_sfnt_off0000da7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA7E 10336 bytes
SHA-256: a8c991743753f99f3113939ff7f9c47c266dbdcf561bcbcceeabd929f33edc1b

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