Malicious PDF — malware analysis report

Static analysis result for SHA-256 c837927062a1fa4a…

MALICIOUS

PDF

78.0 KB Created: 2021-02-11 09:41:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: dea279aabf11828b78c651400e005ac2 SHA-1: f05978073dc7f2c4f1dd97f735efb7001924e4c3 SHA-256: c837927062a1fa4a4fbdb0c4285da923803755421d73e5f7ca56ab695f0e36aa
164 Risk Score

Malware Insights

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

The PDF document contains a lure related to a 'visa japan form' and includes numerous external links, many of which are hosted on suspicious domains. The presence of the 'SE_INVOICE_LURE' heuristic and the 'PDF_SEO_LINK_FARM' rule strongly suggest a phishing or malicious content delivery attempt. ClamAV also detected this file as 'Pdf.Phishing.Trojan'.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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/wb?keyword=request%20for%20multiple%20visa%20japan%20form PDF link annotation
    • https://cdn.sqhk.co/zapajugadira/hdHY5Mn/razadyne_er_is_used_for_recovery_of.pdfIn PDF document text
    • https://cdn.sqhk.co/pevejotomoma/bIKgdlZ/bimezowedatopisil.pdfIn PDF document text
    • https://cdn.sqhk.co/niwonosorude/cRsWhbW/online_birthday_cake_with_name_and_picture.pdfIn PDF document text
    • https://cdn.sqhk.co/rabuvimi/hsdwejf/28983740027.pdfIn PDF document text
    • https://cdn.sqhk.co/vufisolepu/jg4ggvl/modern_air_combat_team_match_gift_code.pdfIn PDF document text
    • https://cdn.sqhk.co/vujixete/hbhfjjU/42610612931.pdfIn PDF document text
    • https://cdn.sqhk.co/borefigux/dEvVid4/72762436182.pdfIn PDF document text
    • https://wisiwojapano.weebly.com/uploads/1/3/4/8/134896472/9656120.pdfIn PDF document text
    • https://cdn.sqhk.co/sovokeduseb/ehecSie/74613805861.pdfIn PDF document text
    • https://cdn.sqhk.co/vigeroti/jifhejg/thurgood_marshall_football_schedule_2020.pdfIn PDF document text
    • https://cdn.sqhk.co/satasevubu/qhiiaYQ/73343218595.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fikuputo.epizy.com/guided_access_iphone_x_max.pdfIn PDF document text
    • http://movedubeliw.epizy.com/rudesolisabofewakiv.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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e477.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE477 6744 bytes
SHA-256: 168f2717c0f8bf403ea9c75be00852470ae846c6c718186f95322882c1c07e87
font_01_sfnt_off0000f55c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF55C 5316 bytes
SHA-256: 4f5e88be660c1c550622557980146bedb8253c2ae724a84e2ef0f7a933782825
font_02_sfnt_off00010771.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10771 10348 bytes
SHA-256: 98f90b0ef6da810ad6f017040723d043ae1b26bb6a3eb0182203156291fef789

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