Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0aad8a5fff9a6ac…

MALICIOUS

PDF

81.0 KB Created: 2021-03-21 07:30:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: eb7e9c88a31898fb0c5559fc69eb8c51 SHA-1: 723b743e827e44f4a895959333fbb92a2bdbd86f SHA-256: b0aad8a5fff9a6ac065a880883feca7a3e75d6615048d52626f826ac3ecc7a79
166 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses an MFA/2FA-themed lure. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://xajibur.ru/wix?keyword=free+gem+generator+clash+royale+no+verification PDF link annotation
    • https://cdn.sqhk.co/modonasuje/hf0jcif/4288708653.pdfIn PDF document text
    • http://woxuruko.medianewsonline.com/30118548963.pdfIn PDF document text
    • https://cdn.sqhk.co/pigevikuwi/iTLhjDX/fuwuwiwatexaxulakinap.pdfIn PDF document text
    • http://jasazotinalol.mygamesonline.org/dumatogukitomuki.pdfIn PDF document text
    • http://xilexevu.scienceontheweb.net/pivobifojakig.pdfIn PDF document text
    • https://cdn.sqhk.co/vuwonesi/igjcgjo/basket_busters_ar_basketball_augmented_reality.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/cf551b10-1823-4c4a-8473-0b9221a519b0/zesux.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4929ffcb-5f4d-4539-bd42-50f074b2931b/how_to_get_3_digit_voice_response_number.pdfIn PDF document text
    • http://gikiwajufekozi.rf.gd/list_of_engineering_colleges_in_pune_university_with_code.pdfIn PDF document text
    • http://luxupuxud.myartsonline.com/subtraction_with_borrowing_worksheets.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8acd8b8a-e68f-473e-b10e-c3915f271866/2008_dodge_grand_caravan_headlight_assembly_removal.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/86bce796-eedd-4c9f-81bf-3f1823e17f93/funotazajofetemufowakep.pdfIn PDF document text
    • http://kujafugakare.epizy.com/tu_aur_patlu_ki_jodi.pdfIn PDF document text
    • http://rorazizaxaf.atwebpages.com/bepigegemutopomafa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4b3c9a18-cca6-44e6-86e2-c8eabd939440/afterglow_xbox_360_controller_not_working_pc.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ff06869b-b73c-43bc-ae0f-6fa4f48b9a0e/91973652703.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2a969c97-9178-42cd-aa38-235a87dcf64a/dan_simmons_hyperion_characters.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eacf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEACF 5412 bytes
SHA-256: 7e695b9f75d479bb3d4178fad0de9cc6205307e54865e69a67720ddf3d532b16
font_01_sfnt_off0000fd20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD20 10300 bytes
SHA-256: e2555412fa1bc9434d82d99d29043bee2ad70fa2868320230c7e02ea31834ea0
font_02_sfnt_off0001209b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1209B 16312 bytes
SHA-256: bf8f9ece8d9d74ce2d7a98a07ee1bb8f4056faf702b3b1702118181e85f1b939

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