Malicious PDF — malware analysis report

Static analysis result for SHA-256 921a26d8838ad687…

MALICIOUS

PDF

77.8 KB Created: 2021-03-24 10:33:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c2576181a30b71ffa5c993e441291365 SHA-1: e0501782641a78f3011236f26db35448ecdf53ee SHA-256: 921a26d8838ad6874978837da90e85d55b8c131606a09a72d7b8df6060a77a5f
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many of which are part of a link farm designed to appear as legitimate search results for a book download. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically phishing and potentially trojan delivery. The embedded URLs suggest an attempt to redirect users to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://pelibifir.ru/award?keyword=understanding+business+12th+edition+pdf+free+download
    • https://cdn-cms.f-static.net/uploads/4454668/normal_5fd62f9a6eda8.pdf
    • http://beautysss.site/kovurasifisafekotlmys3.pdf
    • https://cdn-cms.f-static.net/uploads/4445871/normal_603f056c36612.pdf
    • http://se-mrush.com/donation_request_template_freef9c7z.pdf
    • http://raisinsapp.club/sum_of_the_interior_angles_of_a_triangle_2_worksheet_answer_key46ovk.pdf
    • http://italysummer.fun/bupixakebiakr7d.pdf
    • https://cdn-cms.f-static.net/uploads/4459165/normal_60217d11b7586.pdf
    • http://marketes.pro/zinad7m845.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://56148a0a-83a3-4003-94ff-78d3044b7c00.filesusr.com/ugd/6f5f23_d343f4f4674348948319529422c8285c.pdf?index=true
    • https://6cb1c90e-07cf-4522-b85d-4edd8abc33c8.filesusr.com/ugd/0c41e7_1d9a210ad3104a45a9c4fe702b521a36.pdf?index=true
    • https://uploads.strikinglycdn.com/files/ab4c26df-4d56-4a76-a63d-2cb3cba2fab7/fapepovepiz.pdf
    • https://1864c106-1a4f-4194-99fb-dabd5a0af450.filesusr.com/ugd/17b194_377e193b616d495a876279defc7edff8.pdf?index=true
    • https://8f20b4bd-83f7-4a55-8c6f-e9501e2e061c.filesusr.com/ugd/c1c462_68b1bcbe62804504bd0616e4a60e1b55.pdf?index=true
    • https://uploads.strikinglycdn.com/files/713ad08a-7e8d-4d14-81ec-073a048db2a8/how_much_is_a_200_lb_yellowfin_tuna_worth.pdf
    • https://uploads.strikinglycdn.com/files/c4732aaf-3d01-4fee-b898-6a274faa4966/dress-down_day_meaning_in_spanish.pdf
    • https://uploads.strikinglycdn.com/files/ed080520-5c4c-4efb-9843-5284705774b0/dupebolazetaku.pdf
    • https://1058d175-53f8-4d86-9201-ae9c1fc74009.filesusr.com/ugd/62a633_03eb80a3895a4bea8d85e7511ff8a46c.pdf?index=true
    • https://uploads.strikinglycdn.com/files/4e5b9d4c-14c0-4541-a115-b703a9d76bdf/39792037900.pdf
    • https://uploads.strikinglycdn.com/files/b1074cea-848b-4d44-95ba-99f5b8b74aa0/feliz_navidad_lyrics_and_chords_key_of_c.pdf
    • https://uploads.strikinglycdn.com/files/91763af5-f386-4885-a77b-f1c8a186efac/84830802815.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_off0000e107.bin
1385e7b8f6fca03838b520e0fe526ec5b5c170950625cfddb683a576576cf19f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE107 5592 bytes
font_01_sfnt_off0000f416.bin
a64eb626cec5f7e725cb8eac859a601c8221a531e5b2b217b97787342932db05		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF416 10896 bytes
font_02_sfnt_off0001193d.bin
ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1193D 4324 bytes

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