Malicious PDF — malware analysis report

Static analysis result for SHA-256 8dc4182d96962d04…

MALICIOUS

PDF

83.5 KB Created: 2021-04-16 18:54:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9db75dc4d9c157e87db406e3e1a6a89b SHA-1: c0d0bee37de9370b7bf3c5d9a930caad6fcf19c4 SHA-256: 8dc4182d96962d0421ee8c30cbc94cec5879d78af4c35b3c3de5f69e6ce52acb
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, with one specifically pointing to 'maypoin.ru/strik', suggesting a phishing or malware distribution attempt. 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 0.9990

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 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://maypoin.ru/strik?utm_term=how+to+build+your+own+water+system
    • http://podarokinsta24.online/tosekaxumtns.pdf
    • https://static.s123-cdn-static.com/uploads/4444114/normal_5fca9f341b90b.pdf
    • https://cdn.sqhk.co/nemisova/hhjfOPV/faked.pdf
    • https://cdn-cms.f-static.net/uploads/4393345/normal_604e9f3b3d700.pdf
    • https://cdn-cms.f-static.net/uploads/4411479/normal_5feaf19321c64.pdf
    • http://winclean-shop.space/nafikogubefofoguba725tm.pdf
    • https://cdn.sqhk.co/jasamomedam/QgfAzq9/gsmarena_compare_camera.pdf
    • http://xozonline.ru/totopos_word_meaning7cnwi.pdf
    • http://dajutim.22web.org/kodewazog.pdf
    • https://cdn-cms.f-static.net/uploads/4475985/normal_6016deaa8dea6.pdf
    • http://the-english-temple.com/wotifumanufegamefblmvl.pdf
    • https://cdn.sqhk.co/sunomedude/hzgdFQN/ziwovuwixudebitividujale.pdf
    • https://cdn-cms.f-static.net/uploads/4414864/normal_5fd1ac91619e7.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://11627308-8c8f-4f08-99ed-0ad85160907d.filesusr.com/ugd/682d1c_fee639acb6db4946935fe51f0dd6fa58.pdf?index=true
    • https://cb38ef3f-1f2c-4622-8962-dca261660167.filesusr.com/ugd/3ae201_a0a5b5e1531e4332b5158e7c53f67582.pdf?index=true
    • https://7be326e9-a1fd-4761-a84c-83c904220737.filesusr.com/ugd/37e945_df530be7167942459c5f3798a39ace50.pdf?index=true
    • http://nofadokar.rf.gd/heads_up_email_template.pdf
    • http://jawedujap.rf.gd/87792098437.pdf
    • http://vixadit.rf.gd/dejodoripokalelanigejujid.pdf
    • http://mexoguxeje.rf.gd/nobefufevap.pdf
    • https://uploads.strikinglycdn.com/files/a00b8a89-9b19-4c73-85b4-90a15e3ac965/black_and_decker_18v_cordless_drill_instruction_manual.pdf
    • https://88bec3ce-9cdd-4818-a95b-bcf8ac49d1e7.filesusr.com/ugd/72df48_ae5c8c96e35e480f9b8b61c3514e9b56.pdf?index=true
    • https://73c25812-7308-4b32-b985-10e2a25710ca.filesusr.com/ugd/5b604d_5552c779636b47f6ab13e9e1c258c165.pdf?index=true
    • https://uploads.strikinglycdn.com/files/a6d0b4fa-22b6-4df9-9415-55bc03d3f102/petasoxuxivogulimor.pdf
    • 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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f276.bin
070acd0c8da6f179b59df06c315b4a27bb7f4e8d6155c4f0379fac3b7f6b5650		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF276 5264 bytes
font_01_sfnt_off00010450.bin
d3eaf0ceec591687cb8ff320d771bd954da7fd47622de0464151c1cc0af0390e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10450 11156 bytes
font_02_sfnt_off00012ac0.bin
c988415812f594187b0a0ed75dc52802e798e1695b49bd300f8412a65040a449		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12AC0 16204 bytes

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