Malicious PDF — malware analysis report

Static analysis result for SHA-256 d56c50f0ec148146…

MALICIOUS

PDF

83.0 KB Created: 2021-03-14 08:11:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9289e5115460bdf295943babd03e7b46 SHA-1: 71381c287eaddde1a2c64a22d61d29c0d8d66ada SHA-256: d56c50f0ec148146c02a4003d1bae1e012bc073e269c17bb1a4ac953b9aa4537
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with a critical heuristic identifying it as a link farm. The ML classifier and ClamAV detection strongly indicate maliciousness. The embedded URLs, such as https://lozipotod.ru/wix?keyword=the+devil+wears+prada+questions+worksheet+answers, suggest a phishing or malware distribution attempt disguised as a worksheet.

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://lozipotod.ru/wix?keyword=the+devil+wears+prada+questions+worksheet+answers
    • https://fefodenajefive.weebly.com/uploads/1/3/1/4/131437461/zukagokatenatu.pdf
    • http://tiriruno.sportsontheweb.net/apollo_munich_optima_restore_policy_wording.pdf
    • https://mesirurot.weebly.com/uploads/1/3/4/7/134706751/nunejopo.pdf
    • http://wegansit.space/lowerizajadutezie7pt.pdf
    • http://missunik.space/tujolipidixibuzuju5rxgt.pdf
    • http://lesantyqas.online/8173515854cg7zo.pdf
    • http://microdigitalmeter.xyz/15904593363mc1zg.pdf
    • http://private-channel.site/13987543108c14rj.pdf
    • http://lestyprin.online/history_of_muslim_civilization6rdt4.pdf
    • http://paringljkf.com/rockstar_full_movie_free_720p_bluray32btw.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/547b2a49-0679-4ea3-95cd-3b0994ff781c/what_does_rosemarys_baby_look_like.pdf
    • http://tiwatimab.atwebpages.com/ge_spacemaker_microwave_manual_jvm1650.pdf
    • http://sazasewugekupej.onlinewebshop.net/77584943689.pdf
    • https://71b4061d-0fbe-47a8-a671-08758978b022.filesusr.com/ugd/0216f2_8b11b8f4207e4ba5b82da5f443431f0e.pdf?index=true
    • https://uploads.strikinglycdn.com/files/183c6e98-d779-439b-9103-e3a105107b7e/59167584551.pdf
    • https://d668ac4b-7052-46b9-8d0c-7e282d24ced7.filesusr.com/ugd/00fc84_954be038bcfa4d2f995ff1d9c9b55f76.pdf?index=true
    • https://98748e4b-3258-471a-903e-8ea98415cca0.filesusr.com/ugd/fd7405_926c928692d543b9b6860de0c2f99a0a.pdf?index=true
    • https://uploads.strikinglycdn.com/files/4d8c0e72-7c0f-462a-9075-5d741579e3fe/xutototukakuna.pdf
    • https://02bc4616-4eae-4b38-b2c9-0e654f754ee0.filesusr.com/ugd/069df5_a529035d847e45208e8a9efb642066ed.pdf?index=true
    • https://e437b920-fa79-41d5-b67c-0ca059f4e77a.filesusr.com/ugd/d97c10_6ad1204bfccb4c92bb0be896eea0de9d.pdf?index=true
    • https://uploads.strikinglycdn.com/files/c9f79892-b4d0-4a12-9401-0bbc9a9202aa/what_are_the_main_components_of_mission.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000108c0.bin
0259862cd49bf6341377a3522b393c08d47e8c3d8e8e89140346c9b61bcdbfc0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x108C0 5336 bytes
font_01_sfnt_off00011af3.bin
1974bd99cadd907a0e9cdd3859b3fb7cbedc081c4ad0dbc7061da1cabfb0bd77		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11AF3 10508 bytes

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