Malicious PDF — malware analysis report

Static analysis result for SHA-256 66ec243d9bac7624…

MALICIOUS

PDF

76.1 KB Created: 2021-02-27 16:54:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 2608e63fab73f3e0450f3e83a750299d SHA-1: 1050044be8f013bca9a7ad94292b1dc40030a039 SHA-256: 66ec243d9bac762459ac69f1e2ace2e358a981657ef5d323cffebae94a444068
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The document body, though heavily obfuscated, contains text related to software downloads, reinforcing the phishing lure.

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/strik?utm_term=bittorrent+free+download+for+windows+7+32+bit+softonic PDF link annotation
    • http://lienforkid.com/graphic_design_portfolio_template_indesignq8net.pdfIn PDF document text
    • https://tipuvativojodud.weebly.com/uploads/1/3/4/7/134754547/pegoxamosenavule.pdfIn PDF document text
    • https://cdn.sqhk.co/nerenina/Rii1nxN/vibopunorowojegonume.pdfIn PDF document text
    • http://vapabamulu.22web.org/whatsapp_plus_v7._35_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/tononapiwaso/qk8Ljdn/wallpaper_4k_ultra_hd_game_of_thrones.pdfIn PDF document text
    • https://xikoroto.weebly.com/uploads/1/3/4/3/134338579/pizixudadawoto.pdfIn PDF document text
    • https://pedogore.weebly.com/uploads/1/3/2/8/132815008/pipegosuxo.pdfIn PDF document text
    • https://cdn.sqhk.co/xugufufifo/ijfl75e/translate_english_to_japanese_character_free.pdfIn PDF document text
    • http://habirovradik.ru/menamoteredi0mstm.pdfIn PDF document text
    • http://trenketo.buzz/pac_man_fever_album_downloadev18m.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/zamuriza/47129555640.pdfIn PDF document text
    • http://letozin.rf.gd/alcohol_withdrawal_symptoms_nice_guidelines.pdfIn PDF document text
    • http://bixezuguvibubu.epizy.com/what_is_tree_diagram_example.pdfIn PDF document text
    • https://s3.amazonaws.com/babuxufarizuxur/kabike.pdfIn PDF document text
    • http://sidepojedava.myartsonline.com/gisakuvivi.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_off0000ec6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC6C 5672 bytes
SHA-256: cfeb20571eaa88f65d5e5e2e8468c270900a1adece1c580b1128b33e9d068fbf
font_01_sfnt_off0000ffe7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFE7 10180 bytes
SHA-256: 23ad9aee20161f64288ca655aa3436e7f40b327bfe4847031123fde6afb14f6b

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