Malicious PDF — malware analysis report

Static analysis result for SHA-256 9685aa5ef0f8fb8b…

MALICIOUS

PDF

80.7 KB Created: 2021-01-20 04:45:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: c5afa60e08c0beae821ffe42e90df036 SHA-1: c119a37d7f1db948ee6080f966b7f1a5d4b365da SHA-256: 9685aa5ef0f8fb8b446cc165a89f11a19463879664bbe5ddeedcb7ae5ad96a42
184 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with at least one identified as a malicious redirector. The document body, though heavily obfuscated, contains references to 'Disney pixar pop up game' and 'wkhtmltopdf', suggesting a lure to a potentially malicious website. The presence of numerous links and the ML classifier's high confidence score indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://cctraff.ru/123?utm_term=disney+pixar+pop+up+game In PDF document text
    • https://cdn-cms.f-static.net/uploads/4385620/normal_5f910eb97a21c.pdfIn PDF document text
    • https://cdn.sqhk.co/xexisini/ijeQzid/73193294824.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4464525/normal_60019b010e843.pdfIn PDF document text
    • https://cdn.sqhk.co/zuxafopagad/Pgejhge/paypal_business_send_invoices_and_track_sales.pdfIn PDF document text
    • https://cdn.sqhk.co/vipujitebiki/igjfJHc/54102332487.pdfIn PDF document text
    • https://site-1177180.mozfiles.com/files/1177180/spanish_clothing_vocabulary_worksheet.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446930/normal_5febf6763987c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419822/normal_5fa1881d6bcc7.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://resisimokopi.epizy.com/bozukakugivejilazusapeku.pdfIn PDF document text
    • http://guradewididexep.epizy.com/sawogidodoxavepovisufamoz.pdfIn PDF document text
    • http://funuduki.rf.gd/28733398500.pdfIn PDF document text
    • http://voxosejak.rf.gd/64438674104.pdfIn PDF document text
    • http://getozareburi.rf.gd/post_nuptial_agreement_maryland_template.pdfIn PDF document text
    • http://pagosunizuboroz.epizy.com/sources_of_contamination_of_water.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f2c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2C8 5080 bytes
SHA-256: ec1fcd35738390dfe00d31afb25fee48a31f504c73d38166b25782f7f3b05cad
font_01_sfnt_off000103fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103FD 10616 bytes
SHA-256: 3eccf20d2ac45d8432648087b4481c2e65b7a150b7fbbbdd2242b05ba565f961
font_02_sfnt_off00012815.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12815 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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