Malicious PDF — malware analysis report

Static analysis result for SHA-256 2fbdc318088be15c…

MALICIOUS

PDF

93.8 KB Created: 2021-01-23 23:08:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 02f7750a6062cb6c8fa9e01ac4117bde SHA-1: 74fd08c951a19462060eac97e02db45ef7afcb94 SHA-256: 2fbdc318088be15c634f8e0a7d933919b9a6713ed239dc38928465725f75d4f7
126 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, one of which is associated with a 'Walmart black friday deals' keyword, suggesting a phishing lure. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using numerous disposable domains for hosting, further supporting a malicious intent. ClamAV detection as 'Pdf.Phishing.Trojan' confirms the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://bologen.ru/wb?keyword=walmart%20black%20friday%20deals%2020202 PDF link annotation
    • https://tirepululavapiw.weebly.com/uploads/1/3/4/5/134576363/b20cbf86.pdfIn PDF document text
    • https://site-1168155.mozfiles.com/files/1168155/58457744788.pdfIn PDF document text
    • https://site-1178349.mozfiles.com/files/1178349/naruto_battle_arena_2_mugen.pdfIn PDF document text
    • https://site-1246790.mozfiles.com/files/1246790/rekosezadibof.pdfIn PDF document text
    • https://site-1172047.mozfiles.com/files/1172047/jegolaxuvasixikapom.pdfIn PDF document text
    • https://site-1252632.mozfiles.com/files/1252632/apartment_1303_parents_guide.pdfIn PDF document text
    • https://site-1168430.mozfiles.com/files/1168430/tifoborofi.pdfIn PDF document text
    • https://site-1176298.mozfiles.com/files/1176298/samurai_vs_zombies_defense_2020.pdfIn PDF document text
    • https://site-1175416.mozfiles.com/files/1175416/82531338659.pdfIn PDF document text
    • https://site-1171371.mozfiles.com/files/1171371/naming_hydrocarbons_exercises_with_answers.pdfIn PDF document text
    • https://site-1243564.mozfiles.com/files/1243564/whatsapp_plus_for_android_apk.pdfIn PDF document text
    • https://site-1178096.mozfiles.com/files/1178096/vonudeb.pdfIn PDF document text
    • https://basedupapopulow.weebly.com/uploads/1/3/4/3/134344364/3789302.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/dinisemowoge/case_files_family_medicine_4th.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013109.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13109 5760 bytes
SHA-256: 07fcd4ce1138f790378ac6510dad662a731e88489dbd349c445fe5afb8678c40
font_01_sfnt_off000144a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x144A7 11068 bytes
SHA-256: 697edd8a1a1ddf319e29b495e483ee2ea4272c21003ec4cd6aa01ed5c5b8bc14

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