Malicious PDF — malware analysis report

Static analysis result for SHA-256 51cee4cb9796e1bb…

MALICIOUS

PDF

72.8 KB Created: 2021-01-13 16:03:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: fcf0d398a720942ab0898c11c1535a31 SHA-1: c23c7898e4655aed72fcee19587e319e866ed6d6 SHA-256: 51cee4cb9796e1bb80478252136797f9814290503fd72cfa836ec2874495d92c
184 Risk Score

Malware Insights

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

The PDF contains embedded links that redirect to known malicious infrastructure, specifically `traffking.ru`. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though heavily obfuscated, contains references to job descriptions and the authoring application, suggesting a lure to entice users to click the malicious link.

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
  • 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://traffking.ru/123?utm_term=city+of+tulsa+job+descriptions In PDF document text
    • https://cdn-cms.f-static.net/uploads/4369514/normal_5f9e0967470cb.pdfIn PDF document text
    • https://wadazujirala.weebly.com/uploads/1/3/4/5/134596454/809758.pdfIn PDF document text
    • https://site-1179282.mozfiles.com/files/1179282/family_dollar_locations_near_me.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4382187/normal_5ff75674cdbb8.pdfIn PDF document text
    • https://rowofijiguni.weebly.com/uploads/1/3/4/4/134479741/malidurusowifip.pdfIn PDF document text
    • https://tanaxigurav.weebly.com/uploads/1/3/4/2/134266775/denesanijibep.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414501/normal_5fd9b5d516484.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4492245/normal_5fe3bf5760662.pdfIn PDF document text
    • https://site-1203694.mozfiles.com/files/1203694/kixed.pdfIn PDF document text
    • https://site-1168357.mozfiles.com/files/1168357/49137563891.pdfIn PDF document text
    • https://dawemewi.weebly.com/uploads/1/3/4/7/134747996/8480857.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464996/normal_5fb2ae9434dcb.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
    • https://s3.amazonaws.com/rokuwapesu/best_site_to_cracked_android_games.pdfIn PDF document text
    • https://s3.amazonaws.com/jinabom/jenkintown_police_reports.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_off0000d13a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD13A 5372 bytes
SHA-256: c57ddc1e0e903d16b1d65512944f5fe545c79ee51a28699e0b8f11488493f2b4
font_01_sfnt_off0000e392.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE392 10812 bytes
SHA-256: 55f2774475d6a7ef1033cdb467d10878824b97f2d43649e7e63ddd2b83a2b77e
font_02_sfnt_off0001086e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1086E 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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