Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a213f3a719bfbad…

MALICIOUS

PDF

70.6 KB Created: 2021-03-15 22:00:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 325546f7fccb267ff617e10a3bc39b0e SHA-1: 0615c3d9fb88cd05ce5092993a3524fae28d928c SHA-256: 3a213f3a719bfbad747a575b689aef970f2c9c0d464b34cfd0554d7a353b7edd
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are generated and likely lead to malicious content or phishing sites, as indicated by the 'PDF_SEO_LINK_FARM' heuristic. The ClamAV detection and ML classifier also strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 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.
  • 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://dugedepap.ru/strik?utm_term=amelia+bedelia+read+to+me PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4385231/normal_5fe94994616fd.pdfIn PDF document text
    • https://cdn.sqhk.co/vatukaso/ohige7D/4250280921.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368497/normal_5fe1fcbe5c14a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391013/normal_60257ae32c3ee.pdfIn PDF document text
    • https://cdn.sqhk.co/gufulixofoma/bieUhfw/ant_plugins_service_samsung.pdfIn PDF document text
    • https://cdn.sqhk.co/sigidezok/fwjbBie/sogadu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4492892/normal_5ff137c4457ca.pdfIn PDF document text
    • https://cdn.sqhk.co/wirepoti/hegdQgf/natukubamuvagum.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/dezajok/jukubebezupajizemok.pdfIn PDF document text
    • https://s3.amazonaws.com/selivuvumepaveb/64273061458.pdfIn PDF document text
    • https://b32521b7-32ca-447e-9967-d27d0dce683d.filesusr.com/ugd/800b88_1b2a7def9de54865ba45acbb3eb62cbe.pdf?index=trueIn PDF document text
    • https://6c8ebe11-725c-420b-823a-68bc39d02ad2.filesusr.com/ugd/3e87bf_03abbcae47df497b9da33ca0a8848e3a.pdf?index=trueIn PDF document text
    • https://6998e30b-c911-4113-ab34-4c15204891c7.filesusr.com/ugd/429b25_40cc4e75e74a4fb4adecb87ce6526667.pdf?index=trueIn PDF document text
    • https://f495c71d-628d-4070-9a3d-b699cbb46ba4.filesusr.com/ugd/d99ef3_570d0f2c977c443cbc7febeb0e50ea17.pdf?index=trueIn PDF document text
    • https://e4fb9bf1-a3d6-4767-9bf2-2a1021e5dc09.filesusr.com/ugd/53cfc7_756a271bca274980804898a5e79ee03d.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/didowugorokirug/civil_engineering_interview_questions_on_buildings.pdfIn PDF document text
    • https://5de9ed01-d610-4143-94db-6f998645a8ce.filesusr.com/ugd/1d8bf6_a509c9a211f64fe9aa618ca88236fb2d.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/dazifozixawus/solving_quadratic_equations_easy_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/liwafo/ginawiw.pdfIn PDF document text
    • https://3794eb9c-cc8b-492c-aecc-44533f76aaa6.filesusr.com/ugd/1ee69b_864e8050419a461288cd3fbcd59c78e5.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/lorugipopuxe/just_two_words_puzzle_550.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_off0000d7ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7EF 4924 bytes
SHA-256: 8e72b9c3cebb1ddd59e83f302caa2248c09fffe66c37cf54aa3ac2a4b0d71a9a
font_01_sfnt_off0000e88c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE88C 10744 bytes
SHA-256: c38aa4ee2281ce41f187f393888e761466312f2e71ef61f8459997c7eedd93c8

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