Malicious PDF — malware analysis report

Static analysis result for SHA-256 458fd383ba23cffc…

MALICIOUS

PDF

75.3 KB Created: 2021-03-06 09:53:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f0afb1669a20a49183e83e168f7dc5ca SHA-1: ec825d9049f0186b721465b79d843a2e7ce8e0da SHA-256: 458fd383ba23cffcda51541bae0220a47f1e4b3eab12583b9b0e782eeebb4992
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file contains a large number of external links, characteristic of a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly indicate malicious intent. The PDF's structure and numerous external URIs suggest it's part of a campaign to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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
  • 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://ponafet.ru/123?utm_term=peavey+classic+30+combo+specs
    • https://cdn.sqhk.co/zuzipogowita/gfVgihc/switch_audio_converter_freeware.pdf
    • https://cdn-cms.f-static.net/uploads/4446289/normal_5fd1bad875b69.pdf
    • https://pilewamef.weebly.com/uploads/1/3/4/8/134849526/d6f6cd491c3.pdf
    • https://cdn.sqhk.co/xewebevij/KirsIhg/live_stream_nba_finals_2020_free.pdf
    • https://static.s123-cdn-static.com/uploads/4415051/normal_5fed3e1229b54.pdf
    • https://cdn-cms.f-static.net/uploads/4445573/normal_6021cc1fd60fe.pdf
    • http://rafupofamurawaf.mygamesonline.org/55224855967.pdf
    • https://cdn.sqhk.co/tajudozizif/hifIONK/6157936530.pdf
    • https://cdn.sqhk.co/jevipugirofi/jcObibl/nick_robinson_ex_girlfriend.pdf
    • https://cdn-cms.f-static.net/uploads/4366007/normal_602635fdc3fb1.pdf
    • https://setuwome.weebly.com/uploads/1/3/0/8/130874340/1188936.pdf
    • https://riwaxetonebena.weebly.com/uploads/1/3/4/3/134363930/zuxabogikadipas-kuzetaxekimu.pdf
    • https://static.s123-cdn-static.com/uploads/4413977/normal_5ffb128133556.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cf4de027-7369-46c2-bf93-d69cabef2b5e.filesusr.com/ugd/868b90_b6738049ee9c4b29bafdebe03b095b35.pdf?index=true
    • https://f26e6bca-ce10-4524-9610-ed5ef7c8d48b.filesusr.com/ugd/ac8c68_f06105e5367d45f29c5fe29223606765.pdf?index=true
    • https://uploads.strikinglycdn.com/files/7b25441c-d90a-4cf5-8b47-edaf37cba7bc/28602579486.pdf
    • https://a519209a-2b0a-481f-9fe9-460c873bdc80.filesusr.com/ugd/270e53_55140bebfe724ad1a399395b38cb4a48.pdf?index=true
    • http://punotonaduwize.atwebpages.com/marine_corps_medal_placement_on_dress_blues.pdf
    • https://uploads.strikinglycdn.com/files/56fa17e3-de4e-4474-afcd-f1b3ff4ac9e9/nomejemo.pdf
    • https://9c789f27-b70c-4c9d-9e83-211ee8f99b38.filesusr.com/ugd/bdeb4c_2965c6a6c3ac40ba96bae8cd2fe32c81.pdf?index=true
    • https://uploads.strikinglycdn.com/files/f7a9ad5c-714a-42a5-97ee-dcd087006df3/century_fc_90_welder_parts.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_off0000e75e.bin
76ba41bc4f32cfb45e82026da3e03e9d6ffb6994f9381cb3883f4d6ad35eb217		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE75E 5592 bytes
font_01_sfnt_off0000fa58.bin
12b6f742b1012e8acd7ff5dcbc6eb5f3890cffea8e0e52f05e9df14e3939ac1b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFA58 10852 bytes

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