Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7fbc8b4ab6a00e0…

MALICIOUS

PDF

85.5 KB Created: 2021-03-31 04:45:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 57c59865c95efdcd7d635f471006eee7 SHA-1: 1dee87a50cf74d6d153c466073bdfb834e31d267 SHA-256: a7fbc8b4ab6a00e074fd79ad7ddeb5e8da5c9127807ea53dd10a2f355193e294
126 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, with one prominent URL pointing to 'vilenefex.ru', suggesting it acts as a lure to a potentially malicious site. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further indicates a pattern of using disposable hosting for such links, reinforcing the phishing or malware distribution context.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://vilenefex.ru/wix?keyword=algebra+1+unit+3+functions+test+answers PDF link annotation
    • http://my-favshope.online/zavaxudomovapapaweteb691c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454562/normal_5fe471410f34f.pdfIn PDF document text
    • http://sodalabs.pro/14th_amendment_right_to_travel_without_license8dqe3.pdfIn PDF document text
    • http://mamajan.space/download_fx_sound_enhancer_full31k68.pdfIn PDF document text
    • http://ecoservice-vlad.ru/castlevania_rondo_of_blood_soundtracktwch2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451755/normal_602a2e118be5f.pdfIn PDF document text
    • http://nazhivy.net/34597016042gqgjy.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://ded05c8b-f0d8-42bc-a64b-daa0b63394ca.filesusr.com/ugd/99afdc_3e48c7e509f0437a8501c4eb1097b1ee.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/metubevozisul/emp_attack_survival_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/wujixus/energizer_aaa_alkaline_datasheet.pdfIn PDF document text
    • https://f039f7e9-c7fa-441d-bf3d-2f0e35d6be10.filesusr.com/ugd/80685d_9b3ef8e2cc254816a93d2a3f9b937a99.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/b6744930-d9fc-4169-9500-ac4d07bd2f21/bazomupovanixikow.pdfIn PDF document text
    • https://460eb545-5389-4aa9-9e78-d1074a8bca0c.filesusr.com/ugd/21a131_2b700bac2b89485ebe753a3ba1d759ca.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/9db3b677-9e36-4695-b9f2-e1f984238aa8/motozoxejupo.pdfIn PDF document text
    • https://c140f178-ee45-427e-91fe-a3c5f821f67e.filesusr.com/ugd/ebc5f9_df33a3c79cc2441cb9cb52367a0ea6fc.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/b67b7078-067d-495e-9123-08271a13fb27/91962202964.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/73625688-11c5-4a61-ad24-115a73f65ab1/who_sells_morning_star_bamboo_flooring.pdfIn PDF document text
    • https://s3.amazonaws.com/belopudevuzuza/97104929243.pdfIn PDF document text
    • https://s3.amazonaws.com/fadedosi/63409158460.pdfIn 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_off00010ea5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EA5 5484 bytes
SHA-256: 79f00d3ffdb7951e489c5f374ae251a5eca19dbea953c278c872eb6d34196529
font_01_sfnt_off0001217a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1217A 11732 bytes
SHA-256: 66449a474db6a227327ea34f6923840973ffee4f83df62bb445183f04c9876dd

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