Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6e3283d13cbf9e2…

MALICIOUS

PDF

122.0 KB Created: 2021-02-03 08:22:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 4b8ac071491403cac56ffea51a1647a8 SHA-1: d1486f8b6b5a0d9c1f98abba4a938c69ce78da70 SHA-256: a6e3283d13cbf9e22ea7ab5d93baf9f59e1d2b252703df0ef334a2a393410ff1
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 presence of numerous external URIs, many hosted on disposable domains and utilizing UTM parameters, strongly suggests a phishing or malware distribution campaign. The document body, though heavily obfuscated, contains references to 'wkhtmltopdf' and a URL that aligns with the detected malicious activity.

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://jottigo.ru/123?utm_term=bad+ass+billy+gunn PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4413243/normal_600cbc812487d.pdfIn PDF document text
    • https://cdn.sqhk.co/xavonepez/hhc5EZd/jivup.pdfIn PDF document text
    • http://huseyincanx.com/3914162241s39tl.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4377704/normal_6005e4b2aa494.pdfIn PDF document text
    • http://odemebayisitrafik.com/undertale_megalovania_drum_sheet_music12s80.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374686/normal_5ff40154e8815.pdfIn PDF document text
    • http://brandframeb.com/vikings_football_game_radio_stationqnn5q.pdfIn PDF document text
    • http://brumbum6.xyz/jetizafoxibuxakigufeji7qska.pdfIn PDF document text
    • https://cdn.sqhk.co/kafevinuva/icUBvje/80805356443.pdfIn PDF document text
    • https://cdn.sqhk.co/jajotulix/jijagiq/bored_anyone_wanna_chat.pdfIn PDF document text
    • http://excschool.ru/vocabulary_words_for_high_schooln1ax8.pdfIn PDF document text
    • https://cdn.sqhk.co/pujapipiwat/jaazhgr/fomaxadaje.pdfIn PDF document text
    • https://cdn.sqhk.co/lazujanaziri/h63g2hj/paxagofepidokox.pdfIn PDF document text
    • https://cdn.sqhk.co/nazabimon/hgjficz/ralewotitawi.pdfIn PDF document text
    • https://cdn.sqhk.co/waxipefimafa/1xtd9KV/brutal_street_fight_knockouts.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/besafefaf/wozaxodalifev.pdfIn PDF document text
    • https://s3.amazonaws.com/bokelur/nixopij.pdfIn PDF document text
    • https://s3.amazonaws.com/takebemanijewok/thomas_calculus_solution_book.pdfIn PDF document text
    • https://s3.amazonaws.com/bokofapig/antivirus_program_til_android.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_off00017dfc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17DFC 12140 bytes
SHA-256: 97f8b6dd655150e00be5f64be32767299880cc48e54c3c44e3b096c5d4cf31aa
font_01_sfnt_off0001a51d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A51D 5188 bytes
SHA-256: e8f9390e9ccf02809ea11beb64392e8d9e65ea3f8567df15a68960f9d538522c
font_02_sfnt_off0001b6de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B6DE 10316 bytes
SHA-256: 4fe67cfa41a04b738603351f1df34035f4e27be468c80c16cbb2d9fc3c43b0c6

Open this report in the interactive analyzer, or submit your own file for analysis.