Malicious PDF — malware analysis report

Static analysis result for SHA-256 5330d853ea3e71fb…

MALICIOUS

PDF

81.9 KB Created: 2021-02-16 10:40:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: a44be31decb94c5b01303a646c6b4df9 SHA-1: 78bde9bbc647ad7fcd78568220704de01ca976aa SHA-256: 5330d853ea3e71fb2f0648f1f61ed843a4ed5ac6ee84b292af9a60486901a736
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://druttle.ru/strik?utm_term=who+makes+dayton+furnaces PDF link annotation
    • http://dusosax.66ghz.com/dota_2_auto_chess_assassin_guide.pdfIn PDF document text
    • http://itravelgr.com/maburefotuxopulpagv0.pdfIn PDF document text
    • http://ewwe.space/15193758607rxoby.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414678/normal_6017b8b51a940.pdfIn PDF document text
    • http://kibasemenatax.22web.org/fuel_journal_template_word.pdfIn PDF document text
    • https://cdn.sqhk.co/wogefosa/fJGHxIX/jiziwusaj.pdfIn PDF document text
    • http://sell-toclick.online/91412050026uxo3j.pdfIn PDF document text
    • http://ourfutures.space/types_of_distillatione660a.pdfIn PDF document text
    • https://cdn.sqhk.co/tifapoxur/bcjdA0p/51320890172.pdfIn PDF document text
    • http://tularafujebok.iblogger.org/the_3rd_eye_2_full_movie.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422877/normal_60192cd667f17.pdfIn PDF document text
    • https://cdn.sqhk.co/pategazikiw/3gdPnhi/dollar_tree_near_me_directions.pdfIn PDF document text
    • http://acgmgroup.ru/whatd_i_say_piano_sheet_music40gwq.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wijetifosoxi.epizy.com/63891716019.pdfIn PDF document text
    • https://s3.amazonaws.com/mesotodimus/43631142895.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_off000101e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101E3 5408 bytes
SHA-256: 6b6a4dba06b40856d9b392d6066e8cb769bf6c0aa24434036ea381410e385da8
font_01_sfnt_off00011433.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11433 11312 bytes
SHA-256: c4850fea97fd29731ece62de36977457709866e2d2543ae995de9aea6d665286

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