Malicious PDF — malware analysis report

Static analysis result for SHA-256 9579430334e5d2c3…

MALICIOUS

PDF

92.6 KB Created: 2021-04-20 01:58:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: 11cd68e55c3aab092002e44089c34b37 SHA-1: 21747573c92c2cd72cecbd662a5dfd274e4c544e SHA-256: 9579430334e5d2c3310cff0d6377a4bf0717c3bc74a8f05c417a3780b0daf9c3
134 Risk Score

Malware Insights

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

The PDF document contains numerous external links, with one prominent URL pointing to a suspicious domain. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a link farm on disposable hosting, and the ML classifier and ClamAV detection strongly suggest malicious intent. The document's content, presented as a video question key, is a lure to encourage users to click on the embedded links, which likely lead to phishing or malware.

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 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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/strik?utm_term=mr+smith+goes+to+washington+video+questions+answer+key PDF link annotation
    • https://cdn.sqhk.co/kejopala/hdidign/migenobomarul.pdfIn PDF document text
    • https://likerediweraj.weebly.com/uploads/1/3/4/6/134691167/xugali-voredajefipu-kanuta.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367297/normal_60496788e0b91.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474211/normal_6049785b3fd0f.pdfIn PDF document text
    • https://dulewexafup.weebly.com/uploads/1/3/4/7/134702005/junipidawusifit.pdfIn PDF document text
    • http://diganez.iblogger.org/rufojujakuwifajefuwuvip.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378641/normal_60262178ad88b.pdfIn PDF document text
    • https://cdn.sqhk.co/noneniwetav/hfTgehi/tatebafidewefake.pdfIn PDF document text
    • http://kulofokugizadeb.22web.org/new_york_city_street_map.pdfIn PDF document text
    • https://cdn.sqhk.co/turaxulefa/3ghLNhl/zoxutowugufo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/22804601-d742-4bc4-9efb-e61a65173b27/luzoboropabigabewijef.pdfIn PDF document text
    • https://d1159ab4-cbf5-42eb-897b-83a5e94cd7da.filesusr.com/ugd/536122_cf19d122ca584fa1883f87c99df7038f.pdf?index=trueIn PDF document text
    • https://db22a0a0-c6c8-4eb9-9878-037c50d93224.filesusr.com/ugd/e2b5b3_a77baa20ec0e4cddb40b5722ad43d121.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/5cf3c473-4c13-4619-a8bc-cfcf0651f880/63254810870.pdfIn PDF document text
    • http://dorenavigon.epizy.com/states_of_matter_grade_4.pdfIn PDF document text
    • http://xulitapaxi.rf.gd/37940339166.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7caafbc2-d8b5-4e54-a48d-76f54a2b7b65/how_to_create_a_probability_distribution_in_statcrunch.pdfIn PDF document text
    • https://a540aa65-2eb1-4ac3-86d0-bf6a54daac96.filesusr.com/ugd/2d797c_58213db47e0949898b335114fbcdd8b5.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_off00012a35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A35 5656 bytes
SHA-256: d7f2f0a5662a0ef7e0e1419d2380ce0c904c268749761e191dae119edf89c6f3
font_01_sfnt_off00013d66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D66 11592 bytes
SHA-256: 07f64468b50fe64fe5b260512879873da3d3ebf042ebaed56f303550c64fb170

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