Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ea72070cdd442ff…

MALICIOUS

PDF

73.3 KB Created: 2021-04-04 09:36:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: b3e5d852bbee0e000010007a67ae7196 SHA-1: 215d99dbacc588edb12dbdd11a1d8192fc1dc523 SHA-256: 7ea72070cdd442ff02feb6aefd97479d10a89d847c33f40eecaf65d6ac496dbe
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1539 Steal or Forge Credentials

The sample was detected as malicious by ClamAV and an ML classifier, and heuristics indicate it functions as an MFA or one-time-code harvesting lure. The document body is heavily obfuscated, but the presence of numerous URLs, many hosted on disposable domains, suggests a phishing campaign aimed at stealing credentials. The primary attack vector is likely spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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
  • MFA / one-time-code harvesting lure high SE_MFA_LURE
    Document asks for a one-time code, authenticator approval, or MFA confirmation — consistent with credential phishing kits that steal session tokens or abuse multi-factor authentication
  • 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://druttle.ru/strik?utm_term=robinair+34788ni+replacement+parts PDF link annotation
    • https://cdn.sqhk.co/gonolesuzam/jajedie/pakadovumama.pdfIn PDF document text
    • https://cdn.sqhk.co/fudamewojaf/bjgfl1C/45358968596.pdfIn PDF document text
    • https://cdn.sqhk.co/nofatazor/RGsgc4t/levorel.pdfIn PDF document text
    • https://cdn.sqhk.co/tatogevi/djdiejf/meme_hub_pfp.pdfIn PDF document text
    • http://lelekelosutov.getenjoyment.net/54389670610.pdfIn PDF document text
    • https://cdn.sqhk.co/kitaparek/SyhfBge/sniper_full_movie_2016.pdfIn PDF document text
    • https://cdn.sqhk.co/modajili/vBAjejd/ringtones_free_download_android_mobile.pdfIn PDF document text
    • https://cdn.sqhk.co/kezagajasiw/CbAriik/microsoft_authenticator_qr_code_office_365.pdfIn PDF document text
    • http://wulutano.mywebcommunity.org/surrey_bc_map.pdfIn PDF document text
    • http://sigisuzuk.getenjoyment.net/vadesivopoberixarekilatu.pdfIn PDF document text
    • https://cdn.sqhk.co/xegigujatefa/jdggPgc/hollywood_story_fashion_star_mod_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/papowepu/ojjjihc/zogoroboverola.pdfIn PDF document text
    • http://kaxavetaxudu.mywebcommunity.org/bunajadatazexiram.pdfIn PDF document text
    • https://cdn.sqhk.co/xojugako/jjggDFP/exploration_problem_techniques.pdfIn PDF document text
    • https://cdn.sqhk.co/zovaratigu/jgg4he8/61391372571.pdfIn PDF document text
    • http://senorifeg.iblogger.org/salesforce_report_login_type.pdfIn PDF document text
    • https://cdn.sqhk.co/bubiwalifeda/zjghcDG/toprankers_app_download_for_laptop.pdfIn PDF document text
    • http://kubidojizuw.22web.org/ropelunitotenegazaxoriraf.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/rodigapigeta/78739425031.pdfIn PDF document text
    • https://s3.amazonaws.com/regufojalojaza/levophed_davis_drug_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/wapabefizosumi/lijusumama.pdfIn PDF document text
    • http://fogokenum.onlinewebshop.net/53110162386.pdfIn PDF document text
    • http://kubemumibesedu.epizy.com/air_fryer_oven_elite_manual.pdfIn PDF document text
    • http://gevogorusitaw.epizy.com/how_to_become_an_approved_garage.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_off0000deed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEED 5752 bytes
SHA-256: fbc72e5a1b549e7051734445a8e5c4eebc2cd16a8e9409d47a3be561b09cd0e8
font_01_sfnt_off0000f27d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF27D 10960 bytes
SHA-256: 5661fccbb42259cbff4435e9f0607181bb160a4bd07992cfd685dd6eefa0dc34

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