Malicious PDF — malware analysis report

Static analysis result for SHA-256 c566514bb2067734…

MALICIOUS

PDF

74.4 KB Created: 2021-03-16 09:53:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: bbd003c9b357a2f50d3d02a9fe69b221 SHA-1: 3852988b29209c137489f6dd2272ff8b03dabb01 SHA-256: c566514bb20677347b62ebf03736e9007c0e8fdfcccce4baba9f54b93e6d7283
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a large number of links to disposable domains, disguised as information about trichotillomania. The ML classifier and ClamAV detection strongly indicate maliciousness, with the primary function appearing to be directing users to potentially harmful external sites. The heuristic PDF_SEO_LINK_FARM indicates a link farm designed to manipulate search engine results or distribute malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://jumiwimov.ru/strik?utm_term=how+do+you+stop+trichotillomania PDF link annotation
    • http://cashtanks.fun/95299118658yuy9u.pdfIn PDF document text
    • http://rogosevit.22web.org/tibamezomemelizuzuw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386363/normal_5fd39bc3b2918.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4418167/normal_5fca75af0829c.pdfIn PDF document text
    • http://falutaburifa.iblogger.org/comptel_oyj_annual_report.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481509/normal_602ae01e9cb21.pdfIn PDF document text
    • http://meetsalle.xyz/88672336336wfcq7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501383/normal_601ba704b39bb.pdfIn PDF document text
    • http://remebetegekit.iblogger.org/cooling_tower_types_differences.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426425/normal_602af13d15184.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://f3dbd103-cf2f-44fc-b0ad-c9004dc38af2.filesusr.com/ugd/1f2646_6f8736522a9b4bc9808c6007e673427b.pdf?index=trueIn PDF document text
    • https://58f604bd-1fd8-4cfe-af9b-f15e67d030d5.filesusr.com/ugd/9a7439_bfc49bcdc2cf41f8b37294c461a62f61.pdf?index=trueIn PDF document text
    • https://1a9cd40a-f0d6-44d4-a143-19288280ca2b.filesusr.com/ugd/7a13df_1bcaa6a0a76d47d29a9f1ca63c582cdf.pdf?index=trueIn PDF document text
    • http://faxunarin.epizy.com/a_lesson_before_dying_chapter_12_analysis.pdfIn PDF document text
    • http://zafenuzusovinu.rf.gd/simepapizedu.pdfIn PDF document text
    • https://b133b025-67d1-4190-9e53-fbb99503dec2.filesusr.com/ugd/caf13f_0ab236014fd843888678f5a398b022ee.pdf?index=trueIn PDF document text
    • https://206c1dc7-391c-4b20-ac64-b63c97020fd4.filesusr.com/ugd/87773f_ba2d5dae65e540af93dceb1d6f31a14f.pdf?index=trueIn PDF document text
    • http://ramapenutizawa.epizy.com/marketing_calendar_excel_template_2019.pdfIn PDF document text
    • http://zowujobosega.rf.gd/49388302765.pdfIn PDF document text
    • https://15e12281-0fef-4bb1-b284-2b61ddec1698.filesusr.com/ugd/6c5390_d62d1ae06ae64d8eab89c022ee2694b5.pdf?index=trueIn PDF document text
    • https://5090c2af-253d-40c3-bfb7-942fc6db26b0.filesusr.com/ugd/0511f5_753156554bfb426d90ce9d9862ccb9e7.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_off0000e4e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4E5 5468 bytes
SHA-256: de257c6265ac282066d9780116ad3d0845fe3c01824cd460f6c359d6293b4daa
font_01_sfnt_off0000f765.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF765 10984 bytes
SHA-256: c56da10a085f8a23e6417704b5a1f337b8376cad26ac75d213b82f0311aab23b