Malicious PDF — malware analysis report

Static analysis result for SHA-256 33dab90f1f514129…

MALICIOUS

PDF

82.9 KB Created: 2021-04-06 02:08:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f7f802c7c452f1582b47693d07c59b29 SHA-1: 499f05143f0d07d75320108b04b396eb46e57c77 SHA-256: 33dab90f1f514129bed5a558f9b55e745d749f99550279cf1ddf190a93bb6931
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or SEO manipulation attempt. The ClamAV detection and ML classifier also indicate maliciousness, specifically flagging it as a phishing trojan. While no scripts were explicitly extracted, the presence of numerous external URLs points towards a malicious intent, likely to redirect users to further malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://maypoin.ru/award?keyword=digital+capability+framework+pdf
    • http://xutesirifunevif.22web.org/anabasis_onbinlerin_dn.pdf
    • https://cdn.sqhk.co/deloreba/shid0gc/bingo_piano_sheet_music_easy.pdf
    • http://unosital.space/rozaliziff4x4v.pdf
    • https://cdn.sqhk.co/luwojafewu/pGhdFgc/tojiwipefizuk.pdf
    • https://cdn.sqhk.co/fopikudapom/Yhhfgcw/1007230652.pdf
    • https://cdn-cms.f-static.net/uploads/4474989/normal_6029ce2607068.pdf
    • https://cdn.sqhk.co/nilesatu/jagelju/kindergarten_animals_activities.pdf
    • https://cdn-cms.f-static.net/uploads/4368504/normal_60465d2427b98.pdf
    • https://cdn.sqhk.co/fapebenu/0igigwP/sejafanola.pdf
    • https://cdn.sqhk.co/dujovibipu/2hjjhOO/12610867418.pdf
    • https://cdn.sqhk.co/vukupamita/nXwheiG/guide_and_free_diamonds_for_free_apk_download.pdf
    • https://cdn-cms.f-static.net/uploads/4448550/normal_600b1044bb4f2.pdf
    • https://cdn.sqhk.co/lenubire/jehghhd/29739959795.pdf
    • https://cdn.sqhk.co/bejamisokepu/zqusGig/telemedicine_companies_hiring_doctors.pdf
    • https://cdn.sqhk.co/lomasamube/ibjfIUl/panic_button_app_games.pdf
    • http://bigmagazin.xyz/average_annual_salary_of_a_compliance_specialist8p1r9.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://bb55feb6-a0c4-48ae-8f72-aea2c45912f8.filesusr.com/ugd/b9801a_206542aca3074cfe80c602c65ceab9d6.pdf?index=true
    • https://7f03322d-63d6-449b-a8c2-a80beffeb2b6.filesusr.com/ugd/2994dd_691ef2dbc7ed453082834c28cf0a20db.pdf?index=true
    • https://b7e73dfe-ad35-4791-b4f7-7500f5b7882c.filesusr.com/ugd/bc79a4_8ef2c07cb1a24fb18dc0cb4e73710689.pdf?index=true
    • http://xivutunitilema.epizy.com/carcinoma_de_celulas_escamosas_gatos.pdf
    • http://lekinip.epizy.com/wasasepivadab.pdf
    • https://d1b33a7b-cde1-45d4-bc15-d4d3b6236ac5.filesusr.com/ugd/1d64af_7b56e4f9981c4691ae696b47664afa14.pdf?index=true
    • https://54e283d8-6946-47af-b6e3-c78582312647.filesusr.com/ugd/22cd47_b06be0b068e849fa8d5819f4f626e528.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f9f5.bin
cb9d93b28966fcf101a9430cdc90c08ca91a2cad923e14f399fb61c1fe42674e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF9F5 5692 bytes
font_01_sfnt_off00010d5a.bin
daad3f347a4f42f432ee9983e619a7c063e36761dba5934b469418034847e28e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10D5A 1800 bytes
font_02_sfnt_off000115e8.bin
973e26792fc60bbae4b2f5aa2fc5b085e4d7c4809ecef286043124dbcb345688		 pdf-font-stream PDF embedded font (sfnt) at offset 0x115E8 11456 bytes

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