Malicious PDF — malware analysis report

Static analysis result for SHA-256 af506acbd527428d…

MALICIOUS

PDF

74.8 KB Created: 2021-01-16 17:45:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 42620e0586c5b1e2f08a0ea01cfea0e0 SHA-1: 3adb2542e691ec135cb75f85e8a922103a3491a3 SHA-256: af506acbd527428d4768a833e6d6c6d6c128c1e5ff162f6acead0913e570fa55
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan' and an ML classifier indicating maliciousness. The document body contains text that appears to be a search query, and numerous external URLs are embedded, suggesting a phishing or malware distribution attempt. The presence of external links and the overall structure strongly indicate an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://trafffe.ru/wb?keyword=kick%20movie%20actress%20name PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4482636/normal_6001d879ca33f.pdfIn PDF document text
    • https://site-1172347.mozfiles.com/files/1172347/disney_iphone_app_icons.pdfIn PDF document text
    • https://jufozovujibozom.weebly.com/uploads/1/3/4/3/134360308/5e44d932fe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375355/normal_5f9ff1944654f.pdfIn PDF document text
    • https://cdn.sqhk.co/vuzujugasije/ZGV98rT/xuxen.pdfIn PDF document text
    • https://cdn.sqhk.co/pegipoveridi/he5WP60/52891804479.pdfIn PDF document text
    • https://cdn.sqhk.co/dawajimet/jgP1tjf/nawewoxoligiven.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421350/normal_5faa850a96c46.pdfIn PDF document text
    • https://bejejedagaf.weebly.com/uploads/1/3/4/8/134862385/3228703.pdfIn PDF document text
    • https://site-1168511.mozfiles.com/files/1168511/hollywood_escape_walkthrough_level_7.pdfIn PDF document text
    • https://site-1172915.mozfiles.com/files/1172915/shogun_express_menu_bentonville_ar.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000e7af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7AF 5004 bytes
SHA-256: 91ad87b5d374cb4dca9134388eb30586d5aaa0924ddc124dc8255bd118c4c56b
font_01_sfnt_off0000f8a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8A2 11328 bytes
SHA-256: ee4ddfba610ba8e6d1b9cd1caccd2e7b1e6e4f4695abee6290f4541b36603b89

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