Malicious PDF — malware analysis report

Static analysis result for SHA-256 fbb85c72e3437bea…

MALICIOUS

PDF

63.7 KB Created: 2021-03-20 03:29:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 289bcd63f129643c36fe4f1297d870ef SHA-1: 1049e1da2ef971ec163f8de926e0a46a84c46dcf SHA-256: fbb85c72e3437beae0a5d91404b741d1d33f2d4944b42678c8740aa849c19a40
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV. It contains numerous embedded URLs, many pointing to disposable hosting, and is identified as a link farm. The presence of external URIs and the overall structure suggest an attempt to redirect users to malicious sites, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF format itself can embed JavaScript, which could be used to facilitate these redirects.

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://nipisod.ru/wix?keyword=rise+of+the+runelords+npc+cards PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4366005/normal_5ff2d8e5a4a19.pdfIn PDF document text
    • https://cdn.sqhk.co/lisakopew/ixgiiaz/38121165328.pdfIn PDF document text
    • https://sorawujij.weebly.com/uploads/1/3/4/6/134671526/83107.pdfIn PDF document text
    • https://faliroralomi.weebly.com/uploads/1/3/0/8/130874474/rixavofit.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380863/normal_60553165af888.pdfIn PDF document text
    • http://pazujiz.mygamesonline.org/p90x3_calendar_classic.pdfIn PDF document text
    • http://sexewemomupepu.22web.org/forty_rules_of_love_movie_trailer.pdfIn PDF document text
    • http://dabukim.mygamesonline.org/star_wars_the_force_awakens_4k_steelbook.pdfIn PDF document text
    • http://gazopulodagifus.iblogger.org/dogirov.pdfIn PDF document text
    • https://cdn.sqhk.co/xovinexesun/jb5ZWib/59397737636.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418365/normal_6034064acdbbd.pdfIn PDF document text
    • http://gejejasofubi.mywebcommunity.org/sotatapipejano.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xirofapinowud.atwebpages.com/tegopopowip.pdfIn PDF document text
    • http://bibezakomi.myartsonline.com/the_maze_runner_summary_chapters_10-20.pdfIn PDF document text
    • http://batapijas.myartsonline.com/breckenridge_map.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_off0000bf2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF2B 5248 bytes
SHA-256: fdac4bf7295a7d1de7e5b878721cef4f0038747ee147f5b9b70de93a73ab6cef
font_01_sfnt_off0000d0ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0FF 9624 bytes
SHA-256: 38c6e7430aebbb4a68158d8ad92638786f0b6e88fe00cd33ac1e4fa4f613f5b3

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