Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d9c03fcb7be8df3…

MALICIOUS

PDF

78.9 KB Created: 2021-05-15 22:33:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dbc41ef6c13eed304b6c66b47e6098c4 SHA-1: b04d54155948df3e578fe2020385aca022b390c5 SHA-256: 2d9c03fcb7be8df36a62d93565fcc5219562ed6d7e57c7fc6591eefcc8730f1a
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with one specifically pointing to a URL associated with phishing. The ML classifier and ClamAV detection strongly indicate malicious intent. The PDF_SEO_LINK_FARM heuristic suggests the document is part of a link farm designed to distribute malicious content or phish users, likely by directing them to a second-stage payload or phishing page.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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
  • 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://jumiwimov.ru/strik?utm_term=what%2527s+the+difference+between+dapple+and+piebald
    • https://gesaseli.weebly.com/uploads/1/3/1/3/131379828/2352044.pdf
    • https://cdn-cms.f-static.net/uploads/4404730/normal_600a662f806cc.pdf
    • http://rojibitakuvekuw.scienceontheweb.net/captopril_dosis.pdf
    • https://niwosegebopusa.weebly.com/uploads/1/3/4/5/134583118/0777ce1bac.pdf
    • http://widonatozeg.mypressonline.com/85295881848.pdf
    • https://fulitadu.weebly.com/uploads/1/3/4/8/134863398/kevumukinas.pdf
    • https://pigunakates.weebly.com/uploads/1/3/4/6/134628742/8941276.pdf
    • https://cdn-cms.f-static.net/uploads/4483833/normal_603bdb5597317.pdf
    • https://cdn-cms.f-static.net/uploads/4488141/normal_6011ace62dad3.pdf
    • https://cdn-cms.f-static.net/uploads/4419193/normal_5fd721bd1dbc8.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/nosepevozux/correct_address_format_usa.pdf
    • http://kusababi.onlinewebshop.net/femabutanadedefurif.pdf
    • https://s3.amazonaws.com/timeziso/987750973.pdf
    • https://s3.amazonaws.com/pujirageg/fagabo.pdf
    • https://s3.amazonaws.com/juduk/musolelakekelilevav.pdf
    • https://a8a57b57-a5e9-4b5c-b824-02731ce3a1bd.filesusr.com/ugd/cfa667_5f57b22387324f86b0414b4a0861d54c.pdf?index=true
    • https://s3.amazonaws.com/telasebisu/php_for_the_world_wide_web_conference.pdf
    • https://e082b6be-64c0-45f6-a8ff-82b9c6f476f0.filesusr.com/ugd/1479de_56bbb5170d7449a580d40a9bdc740ffe.pdf?index=true
    • https://0b609444-e5a2-4a7e-9779-a3c6bae51a53.filesusr.com/ugd/529dbf_d1f58ba8ec794cbe84e2d3f399971140.pdf?index=true
    • https://s3.amazonaws.com/wewuxuviwar/57186578332.pdf
    • https://s3.amazonaws.com/kujapomib/how_do_i_connect_my_canon_mg2922_to_wifi.pdf
    • https://s3.amazonaws.com/tevigotu/canning_vale_college_uniform.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f1c0.bin
e4ed10d2ad63d4fb9f0e5d2c59e11e5f3e400625f7b85ca58fc7b41b3c75492b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF1C0 5524 bytes
font_01_sfnt_off0001049f.bin
e9919f306e2b800780c5c3846043bc17884338af2b494c74302661729deaf404		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1049F 11484 bytes

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