Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f52887b0e08bac0…

MALICIOUS

PDF

83.9 KB Created: 2021-04-02 13:09:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 23bfaa6bda9ab68007cdc33e718757a9 SHA-1: 746e4729d223350592d5e2b84f70f6b6ef5e0935 SHA-256: 9f52887b0e08bac01ec64a12b2bc1a96714709f6487d91413b3ee11eed4242e3
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with one specifically identified as a 'SEO link farm', suggesting a tactic to drive traffic to potentially malicious sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a malicious document designed to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://zajinet.ru/wix?keyword=unblocked+online+jigsaw+puzzles
    • http://afracheat1.xyz/votukutuvonaxarubaxulojr3hg5.pdf
    • http://pasetbs.xyz/litawapewqqg6.pdf
    • http://italy50wow.pro/nejuvili1y4k.pdf
    • http://bilabugova.iblogger.org/wufoluzikumabufuderoxaz.pdf
    • http://carbags.site/sukapovoxizivebukemurajxhrd.pdf
    • http://katermore.ru/70427500254jfy3m.pdf
    • http://1offpark.xyz/sukojuxusomuwc198.pdf
    • http://price-list.moscow/narumovorozii8fml.pdf
    • http://twirlini.com/wv_dmv_permit_test_cheat_sheetqvr1f.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://7162f0c1-3bb2-4775-9ad2-1e34613fb889.filesusr.com/ugd/595093_a9c731928b794b4a99159ecd4e98505b.pdf?index=true
    • https://dda5c79a-a75d-44d9-a006-48dec3bfe172.filesusr.com/ugd/115d6e_1adefcb3ac2648459e49d23f872f8e50.pdf?index=true
    • https://uploads.strikinglycdn.com/files/957cb7a1-0018-406b-ae98-30c0c25cba64/29961075677.pdf
    • https://c2bc7a71-cb21-434c-84f6-8d2fc09ed56d.filesusr.com/ugd/03ae60_88d0eafc13e5435994df3b86a0b3e0c1.pdf?index=true
    • http://guvetevuvov.epizy.com/moguriduvokuxulux.pdf
    • https://uploads.strikinglycdn.com/files/5346fd3a-1cc9-4b34-87b0-2810e2a54295/difficult_christmas_word_search.pdf
    • https://uploads.strikinglycdn.com/files/b56d4ad5-834e-4920-8a34-8463923958f7/dream_interpretation_saving_drowning_baby.pdf
    • https://uploads.strikinglycdn.com/files/459dcb84-554f-4f9f-b0a2-dfb409573e38/81750453565.pdf
    • https://e2a3f85e-3ce8-4c76-99a2-e63219cad5ad.filesusr.com/ugd/473d25_8ce9ed132d83447bbdcad7f6c1dff916.pdf?index=true
    • https://cd753cf5-d90a-4073-9c55-931a76e81761.filesusr.com/ugd/8826df_3d1858ed76d949dc90abaadeb8ff7161.pdf?index=true
    • http://lexanowojuraja.epizy.com/xbox_one_emulator_for_android_games.pdf
    • https://uploads.strikinglycdn.com/files/7bdeeb03-179a-40db-b8d9-27cfe1e2d393/wonofazavikewusaf.pdf
    • https://ce322291-b3da-4cc2-ae0f-523e25daec44.filesusr.com/ugd/4530da_875ef732cb1241d2807985e805112a1c.pdf?index=true
    • https://6cdb29d4-22ce-4aaf-9e51-562b59d50851.filesusr.com/ugd/1b20fb_09b52cf61fa04a48af9358529db5a7cf.pdf?index=true
    • 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_off00010769.bin
920d49dc15b2c30ad0af7825795a9568e777d7fb874c3972a956845ee13071c7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10769 5560 bytes
font_01_sfnt_off00011a85.bin
b88ba799ba70051554c7410fb9558d85ffaa23a16e4ef3ac5012bb504a4e81fc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11A85 11528 bytes

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