Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef182cb2e44a7ae9…

MALICIOUS

PDF

75.9 KB Created: 2021-03-19 11:57:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1e65332646a500aeb99023b0099ec284 SHA-1: ea454f25750d8f01725cb0c18b76500d05b46422 SHA-256: ef182cb2e44a7ae9f59c1aef508531b6e717ef73583e669a902b0672717dd7e8
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to disposable domains, identified as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to malicious content.

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://botokaw.ru/123?utm_term=abbyy+fine+reader+software
    • https://cdn-cms.f-static.net/uploads/4481061/normal_6038d87403828.pdf
    • https://cdn-cms.f-static.net/uploads/4473947/normal_60403c7bae476.pdf
    • http://moscow-siberian-force.online/bavavawif5g7.pdf
    • http://strapslap.online/bhaja_govindam_song_meaningo7v37.pdf
    • https://cdn-cms.f-static.net/uploads/4493597/normal_601ad5b500f69.pdf
    • https://xifabaruwene.weebly.com/uploads/1/3/0/9/130969291/389286.pdf
    • https://static.s123-cdn-static.com/uploads/4489409/normal_5fc61e15639c6.pdf
    • http://7evenrp.ru/les_miserable_musical_script653im.pdf
    • https://zunitilamurako.weebly.com/uploads/1/3/4/5/134529552/8781214.pdf
    • https://pivozedotafi.weebly.com/uploads/1/3/1/0/131070355/ruvese.pdf
    • http://tryadasert.online/start_late_finish_rich_by_david_bachfkqmr.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/e2a35606-6543-4a6a-88fa-999d64b44dad/kenmore_elite_washer_error_code_f27.pdf
    • http://vowatutijetig.rf.gd/options_futures_and_other_derivatives_solutions_manual_10th_edition.pdf
    • http://duzebufulumaw.epizy.com/mokezetuwagidetuwu.pdf
    • https://uploads.strikinglycdn.com/files/ac458959-434c-45a2-bb53-0b72b0465702/xugananazak.pdf
    • https://uploads.strikinglycdn.com/files/566a6ce7-36d8-4b4c-a590-81becfd98d6f/dell_inspiron_570_16gb_ram.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_off0000eaa0.bin
9580b5c9db62a9a726c5a25ab86ffece5ce679f96e7d5a5e102dd82d3f22763b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEAA0 5192 bytes
font_01_sfnt_off0000fc6e.bin
68aaaa47816b6cfb96be5ab3f24e4b8e546e41f0af284951b08b1c17384f7ac9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFC6E 11312 bytes

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