Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad73773cea0ceeea…

MALICIOUS

PDF

87.7 KB Created: 2021-03-23 14:24:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 6d6b1f7773c5ab371c0f97039c08c5e1 SHA-1: 0c57ec335a1f99a52dbea2f454daaae744e8c9a8 SHA-256: ad73773cea0ceeeac54435f89c681e59163a006b8efd941a9e1553e615cbe13b
186 Risk Score

Malware Insights

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

The PDF document contains heuristics indicating it is a link farm and a lure for recovery secrets, such as private keys or backup codes. The embedded URLs point to domains that appear to be part of a phishing or scam operation. Although no scripts were explicitly extracted, the ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Recovery secret / private key request critical SE_SECRET_RECOVERY_LURE
    Document requests recovery phrases, private keys, backup codes, or saved passwords. Requests for these secrets in a document are high-risk.
  • 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://seumenha.ru/wix?keyword=digital+certificate+meaning+example PDF link annotation
    • https://cdn.sqhk.co/mikevoponage/ciiLhat/65640588049.pdfIn PDF document text
    • https://cdn.sqhk.co/pipujevi/jrijaje/dulevogonugavetedajufe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382974/normal_60175eb72a639.pdfIn PDF document text
    • http://verifiedbadge-lnstagram.com/safety_first_air_car_seat_instructionsitcx4.pdfIn PDF document text
    • http://13millions-warzone.store/673476600590xykz.pdfIn PDF document text
    • http://pop-marketplace.ru/is_aggression_a_learned_behavior_in_dogsqmqbw.pdfIn PDF document text
    • http://girlita.space/kekosaginovavupegid9k3if.pdfIn PDF document text
    • https://cdn.sqhk.co/poxirowo/chgibtu/vakopovapirexikewusugom.pdfIn PDF document text
    • http://rexapeduke.66ghz.com/bepetipe.pdfIn PDF document text
    • https://cdn.sqhk.co/vipikunowi/dufl9bL/24643346260.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4407788/normal_5fccc9af40ba9.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://3ae4d138-4ba3-4962-98fb-1b98b40a6a82.filesusr.com/ugd/38062a_66257058aecd4cdfae6ba7af25aa2724.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bufipevuril/bizekerafazidijaxovotepug.pdfIn PDF document text
    • https://s3.amazonaws.com/dutimajizowa/mavenawuzoxuz.pdfIn PDF document text
    • https://s3.amazonaws.com/jivala/fitted_sheet_double_argos.pdfIn PDF document text
    • http://rakumutebita.epizy.com/lojekarivog.pdfIn PDF document text
    • https://cd29ef07-728f-4a0b-b57b-23e770395c36.filesusr.com/ugd/f14cf6_6387ae7aaa0042bcbc5f9c46d98d3503.pdf?index=trueIn PDF document text
    • http://jogubemiviju.rf.gd/spanish_medical_terminology_certification.pdfIn PDF document text
    • https://8d5bcf17-53f2-4f21-b585-7a27aef14131.filesusr.com/ugd/7baf93_8d622122e912421b8f8d45478fb976c9.pdf?index=trueIn PDF document text
    • https://e6343aec-df69-40e7-9959-3c0c55bf73c9.filesusr.com/ugd/6a9017_76341b6ce5a14c00bc23d59d12df4496.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/donarepemi/77225027011.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_off00011ad0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AD0 5224 bytes
SHA-256: a5b6931e0798ead74342b6ce7ada8650979e717fc07b0b0598b5a20c2e81d304
font_01_sfnt_off00012c91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C91 10836 bytes
SHA-256: b8cb6922a0bb18106adb88bb43b3200e377abb236b37204a1f4177ed3f14b338

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