Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8ed039ca64a354e…

MALICIOUS

PDF

80.0 KB Created: 2021-02-12 23:47:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 2a017fe984dcf441c3babf36de8c9c1f SHA-1: 5efc6d8a587779daa98a1cf669d0565c5530170e SHA-256: a8ed039ca64a354ef2428057aaa9c593fd1f4b82c67bc85c43bd57f740800711
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 and an ML classifier, indicating malicious intent. The document contains a large number of embedded URLs pointing to external websites, many of which are hosted on disposable domains or link farms, suggesting a phishing or malware distribution scheme. The presence of these links indicates an attempt to redirect users to malicious sites, likely to download further payloads or harvest credentials.

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://bologen.ru/123?utm_term=fiskars+staysharp+max+reel+mower+bag PDF link annotation
    • http://cadenalia.com/android_studio_tutorial_w3schoolsdbrhh.pdfIn PDF document text
    • https://cdn.sqhk.co/kowaziwaso/jfoUhdB/traffic_golden_gate_bridge_cam.pdfIn PDF document text
    • https://tatisosef.weebly.com/uploads/1/3/5/3/135333589/wananozalif_zexalipiziweg_lofesavujimu.pdfIn PDF document text
    • https://cdn.sqhk.co/tavolimogid/UUgdxlR/ritaxudojaxu.pdfIn PDF document text
    • http://cosmosqrab.online/zoxuduhguf3.pdfIn PDF document text
    • http://digitalmedialit.com/b._ed_form_last_date_rajasthanlgedp.pdfIn PDF document text
    • http://itslm.fun/download_jre_8866m7.pdfIn PDF document text
    • http://lifeshop.pro/nadudulirepibu5xgu0.pdfIn PDF document text
    • https://zenavepofiwu.weebly.com/uploads/1/3/1/6/131607810/pinanen.pdfIn PDF document text
    • http://krokoboko3.xyz/wiregonuxopifibekedumojapywqm6.pdfIn PDF document text
    • http://ita-yog.space/non_aromatic_compoundsuh16s.pdfIn PDF document text
    • http://eu-study.ru/idance_sing_cube_bluetooth_karaoke_machine1tmpf.pdfIn PDF document text
    • https://cdn.sqhk.co/xefilelo/JhhJOgj/vitamin_c_deficiency_treatment.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nadiripu.epizy.com/sakido.pdfIn PDF document text
    • http://sulezunabifop.epizy.com/small_child_hand_template.pdfIn PDF document text
    • http://rivebop.epizy.com/baxivewubenowuji.pdfIn PDF document text
    • http://jowatazurusu.epizy.com/happy_birthday_to_you_sheet.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_off0000f7b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7B8 5652 bytes
SHA-256: 06fb3bcee298c0479808391d750be5063dc504e279f9e0ea627ada86a43ca68b
font_01_sfnt_off00010af6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AF6 11180 bytes
SHA-256: bb469c6895a8ba795bc331cb6ed73b1c951982c1f6fb350c9be3e0ea86e6b909

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