Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc03e26476c4a3df…

MALICIOUS

PDF

86.6 KB Created: 2021-03-23 00:47:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 17f2aa8f36561204228ae2fcd03c9e73 SHA-1: becb0d1aa57919b9d34326b174dc2199c233b12a SHA-256: dc03e26476c4a3dfb2cedd06590bda22f973138cf0848364bc685d92c784588e
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, suggesting a link farm or SEO spamming operation. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external links point towards an attempt to redirect users to malicious sites.

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://nipisod.ru/strik?utm_term=what+are+the+best+data+analytics+tools PDF link annotation
    • http://tutixiluvik.22web.org/risc_v_assembly_language.pdfIn PDF document text
    • http://motuxagajoweji.22web.org/depuwipawimojuvidawola.pdfIn PDF document text
    • https://cdn.sqhk.co/mumaxeje/dJxhjal/gutidopobudolalakamubopu.pdfIn PDF document text
    • https://zipatusuf.weebly.com/uploads/1/3/4/0/134012633/magixadejefaso.pdfIn PDF document text
    • https://gikigafe.weebly.com/uploads/1/3/4/4/134440869/bavexovi_kitoxog_tikav.pdfIn PDF document text
    • https://cdn.sqhk.co/bidogefapo/V0oijLv/truck_driving_simulator_game_for_android.pdfIn PDF document text
    • https://cdn.sqhk.co/koxajavu/dWjeO0N/snake_river_farms_vs_costco.pdfIn PDF document text
    • https://buxiniti.weebly.com/uploads/1/3/4/3/134309366/kaxokero.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://79c9c32e-6572-42fd-9c0e-61d057d48a34.filesusr.com/ugd/33a1c8_b4366df97a3f459180e8cd36960f47de.pdf?index=trueIn PDF document text
    • http://zalaxorenisev.epizy.com/44645264454.pdfIn PDF document text
    • https://b998fa74-583e-446a-a2a7-67f41460fdb2.filesusr.com/ugd/e081f8_41808ac036a645ec9d34014ee8f8ec10.pdf?index=trueIn PDF document text
    • https://eae964be-cf9f-49a8-9b2f-00020d526acb.filesusr.com/ugd/e932cf_78e52d7d62e442fd8c15c42b3d8457be.pdf?index=trueIn PDF document text
    • http://wijogural.epizy.com/ice_sheets_melting_2019.pdfIn PDF document text
    • https://62619d47-812b-4c4f-a232-aa08d86264e8.filesusr.com/ugd/6d62c1_a7a753895b7e421d9702456936e56472.pdf?index=trueIn PDF document text
    • https://2dc0326d-ac60-47d8-bf46-f2dc9d334570.filesusr.com/ugd/21b4a7_b5e927fd208b4a359b7673bf3b59b6d6.pdf?index=trueIn PDF document text
    • http://mijikabetabup.rf.gd/suitcase_fusion_team_sync.pdfIn PDF document text
    • https://3465328d-eb21-4af5-a94e-b8fdacefaafa.filesusr.com/ugd/c63bf9_48195558f67a468e92b8fed67dc251f3.pdf?index=trueIn 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010854.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10854 5068 bytes
SHA-256: 86c12e67775294e4b6df40c852ba12e07741712a8e46ccb86e61327509ff9e69
font_01_sfnt_off00011989.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11989 11024 bytes
SHA-256: f4acefcdff65b654440b136193d0e9f763936acbb436533e47df9c645da1bd11
font_02_sfnt_off00013f26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F26 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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