Malicious PDF — malware analysis report

Static analysis result for SHA-256 2485fc6a5743af53…

MALICIOUS

PDF

114.3 KB Created: 2021-04-30 01:15:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 968dc307e8343d697da8e37e7be1b080 SHA-1: c79510238d0e7bba984cfe3a43fa40edf509eb9d SHA-256: 2485fc6a5743af53dac1c0bc9e0cfd0ecf8b63c4af5b11cabbcfc86122511a33
186 Risk Score

Malware Insights

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

This PDF document 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 of which point to disposable hosting or are used in a link farm, suggesting an attempt to manipulate search engine results or redirect users to malicious content. The ClamAV detection further supports its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://seumenha.ru/strik?utm_term=list+of+greek+gods+movies PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4381531/normal_603f46aa467b3.pdfIn PDF document text
    • http://gimarokonul.22web.org/accp_2020.pdfIn PDF document text
    • https://xalemutaxites.weebly.com/uploads/1/3/0/9/130969461/2541782.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4461204/normal_6008036ac9c18.pdfIn PDF document text
    • http://sadeseta.iblogger.org/didipuleru.pdfIn PDF document text
    • https://mijagipiked.weebly.com/uploads/1/3/4/5/134524971/73fd4c54a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4377388/normal_60071a89531f2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4381531/normal_5fcaffe827970.pdfIn PDF document text
    • https://mejavepo.weebly.com/uploads/1/3/1/4/131438157/vuriketuforinu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411480/normal_5fdc36b832a9c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://rufodax.rf.gd/how_to_change_ink_canon_pixma.pdfIn PDF document text
    • https://5d94d51b-2702-4b64-8df3-eadd022f3edc.filesusr.com/ugd/2ddd39_7cda3cc9563b4ad09810f2d151ad6454.pdf?index=trueIn PDF document text
    • https://82656f1f-dd0f-4426-89ca-c5688288f975.filesusr.com/ugd/56de54_830951d8f3f0429a9b0c032d2c1d5a5e.pdf?index=trueIn PDF document text
    • http://boparozib.rf.gd/cvs_warm_steam_vaporizer_spitting_water.pdfIn PDF document text
    • https://932aa67c-856a-4fda-9fc8-fe3f50d4acc2.filesusr.com/ugd/a25eee_7d2b9593917942c9b8531b49db39b45b.pdf?index=trueIn PDF document text
    • https://f6ea5e03-7e7c-4dce-82ee-fd5d223759ef.filesusr.com/ugd/d203ad_d78abefa0b6143c3aa4fd2720e021d53.pdf?index=trueIn PDF document text
    • http://vujiwexamofone.rf.gd/kidapubuz.pdfIn PDF document text
    • http://daporev.epizy.com/dolunafezixo.pdfIn PDF document text
    • http://xifabemifuxiza.rf.gd/definition_of_reading_culture.pdfIn PDF document text
    • https://571cbd0a-ba82-408d-be6d-2df53a8fcfe5.filesusr.com/ugd/02af14_fe94a838c72e454e8a2c1bc9adb493c1.pdf?index=trueIn PDF document text
    • https://bf23b77b-49a9-4bef-a898-a03cfb94aefa.filesusr.com/ugd/134172_fe8ffdbe990e4d84a974b2647afea32d.pdf?index=trueIn PDF document text
    • https://b5b764bc-4fc6-48d7-9a4b-423a4d05f225.filesusr.com/ugd/3f2390_ee528f907e57419a83ccc3b59863572e.pdf?index=trueIn PDF document text
    • http://fusifovizit.rf.gd/84160378436.pdfIn PDF document text
    • https://7fc1e5b2-1dd8-4457-9de2-3dea1ab9f589.filesusr.com/ugd/fedd61_c5bc58f34b3e4f8aaddaecfd65a13aa6.pdf?index=trueIn PDF document text
    • https://78ff948a-0765-49f5-a22c-0fbe0eba7848.filesusr.com/ugd/888d0b_c3f8f36ec6cd4641959c036efa2e1765.pdf?index=trueIn PDF document text
    • http://zobowubi.epizy.com/bodo_video_2018_new.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_off000181e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x181E7 5052 bytes
SHA-256: 2b51375637a31eefa62c3dbc0955de1418516e300c2eb624cac5ad3e7f0b9e7e
font_01_sfnt_off00019314.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19314 12256 bytes
SHA-256: 76e4456abcb9260ea3eeedea414a36aa153d0bd0178a0ce3cbdc779e71fdb639