Malicious PDF — malware analysis report

Static analysis result for SHA-256 46298f9c21c73e31…

MALICIOUS

PDF

78.9 KB Created: 2021-01-06 13:51:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d02b2df3f87544006b756591558a0554 SHA-1: 7aed9e1f43ab6eaa659fbc89c154b565ca0d441e SHA-256: 46298f9c21c73e319207ebcdfa7a64fc63337c3abf8a244e606144d5d2c6ce37
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV detection as 'Pdf.Phishing.Trojan'. It contains numerous embedded URLs pointing to disposable hosting services and a redirector, characteristic of phishing or malware distribution campaigns. The presence of external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly suggest a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://traffnew.ru/aws?utm_term=seismic+unix++for+linux
    • https://papuwupiruji.weebly.com/uploads/1/3/4/3/134348025/1790bbb2413981.pdf
    • https://zitewamim.weebly.com/uploads/1/3/1/4/131454986/9915040.pdf
    • https://davabodijesofid.weebly.com/uploads/1/3/4/4/134474123/f7cc47.pdf
    • https://nosisakapu.weebly.com/uploads/1/3/4/7/134773138/mafilavuv.pdf
    • https://nedugapepo.weebly.com/uploads/1/3/4/2/134265444/tunojabuga_fixaxebinuwo_zebagowijo.pdf
    • https://mokazeke.weebly.com/uploads/1/3/1/3/131384082/rapizixevodafi.pdf
    • https://cdn-cms.f-static.net/uploads/4413570/normal_5fa0327fcbf6a.pdf
    • https://cdn-cms.f-static.net/uploads/4408174/normal_5fa396d7b0196.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/4678804f-7c8b-4491-920b-d3fa460ae8be/teguxefutepuxetudu.pdf
    • https://s3.amazonaws.com/wupiwupiwot/adding_integers_practice.pdf
    • https://uploads.strikinglycdn.com/files/f27202b2-7584-4cbd-a4f9-880e1d876239/94675704287.pdf
    • https://s3.amazonaws.com/juvuraguvutoxif/74280171825.pdf
    • https://uploads.strikinglycdn.com/files/c2114e8c-4113-4b8a-9700-7281d416a091/tuvoriluf.pdf
    • https://uploads.strikinglycdn.com/files/70d8cc12-337f-4407-866d-fa44b3b4aa75/overdressed_elizabeth_cline.pdf
    • https://uploads.strikinglycdn.com/files/8d7db7e4-3d2d-4d0c-8426-53d0b968925a/sandal_plantation_images.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_off0000f574.bin
9c17f1ebd267c8aac933d2504df355e3334f3bc59b54e179512e998eb05d31b3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF574 4988 bytes
font_01_sfnt_off00010660.bin
4c788157b7d653511c9ed534d0b90cfc78de9ef4c95036e1f02e0070157dc52a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10660 12008 bytes

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