Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5e486ac691a1104…

MALICIOUS

PDF

84.0 KB Created: 2021-05-16 14:59:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 8558f5dc4d4939cdb97d5641b34ad7ef SHA-1: b7492230420cc1d25944f0ef580385aca3c2759d SHA-256: c5e486ac691a11040b61d32287c8c3dc75c1bc3c1a046c548fec7dd947eee664
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF file contains a large number of external links, many hosted on disposable domains, indicating a link farm designed to distribute malicious content or facilitate phishing. The ML classifier and ClamAV detection strongly suggest malicious intent. The presence of embedded URLs and the nature of the heuristics point towards the exploitation of PDF vulnerabilities to redirect users to potentially harmful 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://ponafet.ru/strik?utm_term=washington+football+team+trade+rumors PDF link annotation
    • http://lnstagramsupportingcenter.com/bibatigotar87g9.pdfIn PDF document text
    • https://cdn.sqhk.co/nudogada/acbjbq9/77216635130.pdfIn PDF document text
    • https://cdn.sqhk.co/lidupusumoj/6hcFb0c/gexigadavajerududim.pdfIn PDF document text
    • http://mybiol.site/58275892339buh9v.pdfIn PDF document text
    • http://bigpleasure.ru/ms_excel_tutorial_free_download_2020mknw1.pdfIn PDF document text
    • https://cdn.sqhk.co/lopijikuvi/ifigjgy/62757959844.pdfIn PDF document text
    • https://gagegopered.weebly.com/uploads/1/3/4/8/134880179/1815692.pdfIn PDF document text
    • https://xesapexoxes.weebly.com/uploads/1/3/4/6/134633169/xeketuno.pdfIn PDF document text
    • http://my-favshopg.online/que_son_juegos_educacion_fisicaabjub.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/lanaladu/flexible_budget_format.pdfIn PDF document text
    • https://40fd9d30-e691-4ad4-9ff9-7de67b304886.filesusr.com/ugd/45b27a_0d5a8b8985ed412ea629e0ff8311c98a.pdf?index=trueIn PDF document text
    • https://4253c66a-660d-4c83-b31d-f715833d547b.filesusr.com/ugd/d9e9a0_3bc2180370a946029d1a366d439dfa81.pdf?index=trueIn PDF document text
    • https://d0f5cf02-e55f-42e7-ba97-8a4d5a2b8368.filesusr.com/ugd/7f59a0_3a63018b44d44fe7947539515dd2b9b5.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/lukepepe/bawarchi_movie_in_hd.pdfIn PDF document text
    • https://s3.amazonaws.com/tiduro/xewatezasozanobixawi.pdfIn PDF document text
    • https://1a6defe7-92a0-4357-8a70-d3bce85d30c9.filesusr.com/ugd/385065_fe68c0284b754970b907931a828ad08f.pdf?index=trueIn PDF document text
    • https://b7af6bb9-01eb-4839-ab56-764651de4344.filesusr.com/ugd/2486b5_d714aacad5d84f3187716419eb02358e.pdf?index=trueIn PDF document text
    • https://45f91bdd-2b68-4e60-ae2c-b14373ae5332.filesusr.com/ugd/0d089b_748732bcaeb24e3a8789ab9fc77cbb69.pdf?index=trueIn PDF document text
    • https://ba789de2-c385-43ee-b32d-a34c698d1993.filesusr.com/ugd/b7082a_42292addaff54d9b9e2291bc016f5238.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010a38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A38 5476 bytes
SHA-256: f073a738e4d859a9c4f709f0c24f7b04ed27cd0dac26a9c96136ed7109f77b69
font_01_sfnt_off00011cb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CB5 11176 bytes
SHA-256: fc707dcbc1a1482905b737c7ad2fcf3780b37b2015723b79bd8a2d0763376b48

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