Malicious PDF — malware analysis report

Static analysis result for SHA-256 3fa61df6b0eeb360…

MALICIOUS

PDF

71.9 KB Created: 2021-03-18 14:46:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 347d255fe83de2c152540c3cb7b116fc SHA-1: c31eb63b46782484cdc0138671df613d8cc5b699 SHA-256: 3fa61df6b0eeb3607321d8a3733b8019d14d7b9b889cf5f54aa952e8ef78d9a9
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link T1059.007 JavaScript

The sample is a PDF document flagged by multiple heuristics, including ML classification and ClamAV, as malicious. The 'SE_PAYMENT_REDIRECT_LURE' heuristic indicates the document's content is designed to trick users into believing there are new or changed bank instructions. Embedded URLs, such as https://mezovuduw.ru/wix?keyword=menu+button+apk, likely lead to phishing sites or further malware. The document's structure and embedded URLs suggest it is part of a phishing campaign, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Payment redirection / bank-detail change lure high SE_PAYMENT_REDIRECT_LURE
    Document describes new or changed bank, wire, ACH, IBAN, SWIFT, or routing instructions — a high-value business-email-compromise pattern
  • 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.
  • 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://mezovuduw.ru/wix?keyword=menu+button+apk PDF link annotation
    • http://wisecreditscore.info/anomaly_defenders_frees9p80.pdfIn PDF document text
    • http://tiktokcopyrighthelpteam.com/how_to_take_framing_photographyy6r2k.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367650/normal_602ad1525b6c3.pdfIn PDF document text
    • http://keruvimuvom.22web.org/51168653792.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454432/normal_5fdbe500459dc.pdfIn PDF document text
    • http://nowtorrentz.com/kafuwidorukumofadidigu4r0vk.pdfIn PDF document text
    • http://jisutuxoxaza.medianewsonline.com/mokexazom.pdfIn PDF document text
    • http://osmosiotzs.fun/togilunupejijateav1c0.pdfIn PDF document text
    • http://obuv-kozha.ru/web_services_training_in_mumbaihkq1a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377116/normal_604cfce8e4d0b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484812/normal_600e07ecb5cde.pdfIn PDF document text
    • http://firstdoctor.xyz/how_to_program_my_car_remote_to_my_garage_door_openerz2y8l.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4498392/normal_6023cedef292b.pdfIn PDF document text
    • http://tezibif.mygamesonline.org/84801415998.pdfIn PDF document text
    • http://remont-kholodilnikov.website/nasa_federal_credit_union_mortgage_reviewsk7aey.pdfIn PDF document text
    • http://mazafaka69pussy.online/vanezonolanadedntsbh.pdfIn PDF document text
    • http://goodnatural.space/17129738581fzejo.pdfIn PDF document text
    • http://podjem2.club/gilimakuwosogelimenoqy5mu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pezageroxo.rf.gd/bumomuzofopululunu.pdfIn PDF document text
    • http://guxakodokamama.epizy.com/which_prophet_asked_to_see_allah.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_off0000de2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE2E 4716 bytes
SHA-256: 9b56c52b33e08998f91902cc59c14a4043512713178710a186ec351fefe3c5f3
font_01_sfnt_off0000ee58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE58 10560 bytes
SHA-256: a773e6b44e3a70f32e9cf759991fd2dd4a2dbb2f320e4c9730066fed78abfd51

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