Malicious PDF — malware analysis report

Static analysis result for SHA-256 d20767630e998545…

MALICIOUS

PDF

79.2 KB Created: 2021-04-04 11:15:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 775c54654b3fd98ec19a6bbb81bea4cf SHA-1: 05506450dc3c043da37db51895ee2515a60516a0 SHA-256: d20767630e998545d17f4688226e9a8c98127bb9ff069f79eb1ff9374f32c204
134 Risk Score

Malware Insights

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

The PDF document contains heuristics indicating it is a link farm on disposable hosting, with multiple external URIs pointing to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. The document body, though heavily obfuscated, contains keywords related to agreements, reinforcing the lure.

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://resalured.ru/123?utm_term=wholesale+purchase+agreement+contract+pdf PDF link annotation
    • http://zuvalasit.mypressonline.com/pubipodixo.pdfIn PDF document text
    • https://cdn.sqhk.co/birofinud/gjji3hj/etude_house_face_mask_price.pdfIn PDF document text
    • http://newipufisatag.scienceontheweb.net/89102013736.pdfIn PDF document text
    • https://cdn.sqhk.co/sepovili/dgfigjg/amazon_drive_apkmirror.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/fd4b286f-0058-4cec-8cec-815eb6c1db02/pipugabujofajojidik.pdfIn PDF document text
    • https://s3.amazonaws.com/getizar/bewet.pdfIn PDF document text
    • http://jaweratiz.atwebpages.com/high_cholesterol_foods_to_avoid.pdfIn PDF document text
    • https://s3.amazonaws.com/werowibovezoje/novekozuv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/97144f01-9cd0-4a74-835f-02b6050fdf0b/fisher_and_paykel_dishdrawer_manual_dd60.pdfIn PDF document text
    • http://zibevili.onlinewebshop.net/monov.pdfIn PDF document text
    • https://s3.amazonaws.com/napejaxosinages/the_great_american_songbook_christmas_collection.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9ac582d2-5927-4bd8-b46e-b9f48808e3b1/ditamefuj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/85e97940-f36a-4ffd-b735-b16f4ae76526/how_much_does_dallas_swat_make.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/470ce848-6da7-44be-a1e7-5f48e3426461/a_first_course_in_differential_equations_with_modeling_applications_english_10th_edition.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/717e008c-413c-40aa-a14d-306a257c1e08/kaxazikasel.pdfIn PDF document text
    • https://s3.amazonaws.com/nitizobuv/semojumuwo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9ff5f3f2-253e-4f50-9200-94027c2a867a/tuxijejokepuji.pdfIn PDF document text
    • https://s3.amazonaws.com/lekezaru/66821957631.pdfIn PDF document text
    • http://lamupimifuban.onlinewebshop.net/naraj.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_off0000f4f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4F2 5580 bytes
SHA-256: e78e587b5f23bbd3e3381ec5aba7aeb4cfd648b18f84eff5c2b22dc2a13ff142
font_01_sfnt_off000107ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107CE 11620 bytes
SHA-256: ccbe193d69e06965fec83db33bcfd900b663541702d07e5879a9d5792be00889

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