Malicious PDF — malware analysis report

Static analysis result for SHA-256 0131fd44d261f5c1…

MALICIOUS

PDF

77.2 KB Created: 2021-04-01 00:11:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 200154b31aa9c30e50b08d2b41d0099b SHA-1: 9fcc40061bcb99a233225f469847de7da12ca4cc SHA-256: 0131fd44d261f5c1b9ffdc56ad922cda6f5b09580e8fb0f824517a77b0abbf9a
164 Risk Score

Malware Insights

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

The PDF contains numerous external links, with one heuristic specifically identifying a 'PDF link farm'. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of a 'download button' lure further supports a phishing or redirection attack pattern. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to lead users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://xezojetit.ru/wix?keyword=where+to+download+apk+files+reddit
    • https://veguxalefimas.weebly.com/uploads/1/3/1/3/131382166/solex_demiruduw_najopu_vegad.pdf
    • http://kigetipopizatij.getenjoyment.net/44734202379.pdf
    • https://tixuxajus.weebly.com/uploads/1/3/2/6/132682254/3831850.pdf
    • http://jepenufi.getenjoyment.net/fozegorurapusomezoluvi.pdf
    • https://static.s123-cdn-static.com/uploads/4483842/normal_5fffa20a21793.pdf
    • https://filavemegu.weebly.com/uploads/1/3/4/8/134883773/bepurikap_xexomexaluvila_duwurag.pdf
    • https://cdn-cms.f-static.net/uploads/4499021/normal_602d945b6d4b2.pdf
    • https://nowabarabowuxo.weebly.com/uploads/1/3/4/3/134319250/3462658.pdf
    • http://sekujirimabasas.getenjoyment.net/stress_management_worksheets_for_elementary_students.pdf
    • https://lexezidelaxo.weebly.com/uploads/1/3/4/6/134605078/7812772.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/8db65696-f96d-41aa-9473-b4e66ba47b2f/how_to_price_a_pokemon_card.pdf
    • https://uploads.strikinglycdn.com/files/6fd4d507-0547-41eb-8239-d3e8fb8dfd90/honeywell_quietset_tower_fan_with_remote_control_black_hyf290e4.pdf
    • http://rorokepu.atwebpages.com/meaning_of_validity_in_research.pdf
    • https://uploads.strikinglycdn.com/files/38d740a9-df70-478d-9e22-c9e18dbacd24/sisugebewexejez.pdf
    • https://uploads.strikinglycdn.com/files/eaad7c2c-9a78-4f70-bb70-d52b8858c916/zuzoga.pdf
    • https://uploads.strikinglycdn.com/files/2ed6e42e-1559-4e9a-ac21-cd8075ba0d4e/geometry_worksheet.pdf
    • https://uploads.strikinglycdn.com/files/d285d44a-e2de-48d4-a42e-411b4bf84e97/what_kind_of_battery_does_a_2016_chevy_equinox_take.pdf
    • https://uploads.strikinglycdn.com/files/f170b4af-eaab-4667-ac90-f16bc5c6bf44/94869715059.pdf
    • http://mukanebesiva.atwebpages.com/sales_manager_job_interview_questions_and_answers.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e33d.bin
edac768335fafa9ae207b557712b5cce897395e5915605f1da744ea353bb932d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE33D 5088 bytes
font_01_sfnt_off0000f48e.bin
e94357d83e9e6dc0a26f161dcb0c750e5a432a5cf566169c236d370b0d3235c1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF48E 10860 bytes
font_02_sfnt_off00011977.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11977 4324 bytes

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