Malicious PDF — malware analysis report

Static analysis result for SHA-256 766042bc52e3c48b…

MALICIOUS

PDF

94.7 KB Created: 2021-05-12 22:46:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c8d1c75cdd646c44c67e9f93f9a51a79 SHA-1: 7a7062ae3cd2e02b05382af0fc18aa2732d3c771 SHA-256: 766042bc52e3c48b5d7b93ff0f80ec5884d6cb3874732183eef01c63cf52bae2
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many hosted on disposable domains, suggesting a link farm or SEO spam operation. The presence of a URL related to a 'Pentair easy touch control board manual' indicates a lure to attract users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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.
  • 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 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://kuzutuzo.ru/strik?utm_term=pentair+easy+touch+control+board+manual
    • https://cdn-cms.f-static.net/uploads/4369179/normal_6009f5d26bd11.pdf
    • https://cdn-cms.f-static.net/uploads/4408703/normal_603cb4fc4717f.pdf
    • https://kipunelikerave.weebly.com/uploads/1/3/0/9/130969086/128c4201.pdf
    • https://static.s123-cdn-static.com/uploads/4478141/normal_6007f92774628.pdf
    • http://olipaka.xyz/dosukemixx3ygn.pdf
    • https://zovipimisog.weebly.com/uploads/1/3/1/1/131163747/suluratazanal.pdf
    • https://wetebofi.weebly.com/uploads/1/3/1/6/131608016/mixefuwixiluvi.pdf
    • http://pumba.fun/lenovo_yoga_2_pro_specsjjisg.pdf
    • http://unreguezff.rest/who_makes_cabelas_carnivore_meat_grinders4oadk.pdf
    • http://robinmani.site/digevokprxq5.pdf
    • http://rostov-mobile-doctor.ru/dymo_letratag_label_maker_reviews0rekb.pdf
    • https://static.s123-cdn-static.com/uploads/4489415/normal_5fdd33133ea90.pdf
    • http://presalle.xyz/codycross_answers_group_310_puzzle_1x4w4b.pdf
    • https://cdn-cms.f-static.net/uploads/4393925/normal_5fd6339aba77a.pdf
    • https://rowiteruna.weebly.com/uploads/1/3/4/4/134470704/f0318b7.pdf
    • http://sitizinudex.getenjoyment.net/78953358604.pdf
    • http://itwomen.space/jamogifokunigaoxyfg.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://pekowob.onlinewebshop.net/come_alive_piano_sheet_music.pdf
    • http://xomutojekes.myartsonline.com/inorganic_chemistry_notes_free_download.pdf
    • https://92923600-264c-4cb8-9d87-181083d4f0d6.filesusr.com/ugd/0bf43f_3c2bd02276354c2c936f4feba9509743.pdf?index=true
    • https://011f98f8-b45f-4578-a2fd-466b530f7845.filesusr.com/ugd/74e905_709a78b40ffe438681beabac25cc0765.pdf?index=true
    • https://6440a9f6-5e82-4153-977b-4ffe9374ec4a.filesusr.com/ugd/7182f3_e86cea64cad542f3b32c4c72337919b7.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013183.bin
38f47c5dc58d1ce6d6ee458efef204ad0655441b8df173791b70ed2ceacf2e00		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13183 5424 bytes
font_01_sfnt_off000143cc.bin
393550bb1da17726486140764ff409b560e782a6206e6f418ceac62e38b6117e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x143CC 12164 bytes

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