Malicious PDF — malware analysis report

Static analysis result for SHA-256 2e964b5826949b04…

MALICIOUS

PDF

81.0 KB Created: 2021-04-03 19:10:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 9d251934aa072d745fc5edbf2162492c SHA-1: ef1b33d0cde41327744f96f5c272f7e8927a962b SHA-256: 2e964b5826949b04a487a0307707edcbc23bfb4085afdda2a2854950e1f68b9f
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm designed to redirect users to external sites. The document body, though partially corrupted, suggests a lure related to a 'Lord of the flies study guide'. The presence of numerous external URIs, including those on disposable hosting, strongly indicates a phishing or malware distribution attempt, likely leveraging spearphishing as an initial access vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://vilenefex.ru/strik?utm_term=lord+of+the+flies+study+guide+chapters+1-3 PDF link annotation
    • https://cdn.sqhk.co/galudubujuwa/cgcKQif/wivebudofilu.pdfIn PDF document text
    • http://digitalmicroteter.xyz/89229787522en6x3.pdfIn PDF document text
    • https://cdn.sqhk.co/tomubozes/sd9gdjg/57753963138.pdfIn PDF document text
    • http://xasekijig.mypressonline.com/89868167408.pdfIn PDF document text
    • https://cdn.sqhk.co/wojipezusax/hhYghhf/77671259300.pdfIn PDF document text
    • http://fejugutafilevin.scienceontheweb.net/36004567545.pdfIn PDF document text
    • https://cdn.sqhk.co/fakomuse/1hanIje/tumaledomodaz.pdfIn PDF document text
    • http://epipog.com/83006730179qmwc9.pdfIn PDF document text
    • http://changepass.online/ukulele_strumming_patterns_4_4d4fg6.pdfIn PDF document text
    • http://myluckywin.site/49725350520gjhhj.pdfIn PDF document text
    • http://lafowesezojo.scienceontheweb.net/36123318162.pdfIn PDF document text
    • https://cdn.sqhk.co/nudogada/gzUGAic/black_desert_mobile_hashashin_guide.pdfIn PDF document text
    • https://cdn.sqhk.co/zugivakizo/dBeBpgh/28043129010.pdfIn PDF document text
    • https://cdn.sqhk.co/ximegawaso/aPQhaqt/alphazero_go_paper.pdfIn PDF document text
    • https://cdn.sqhk.co/pevukoza/dSObjay/piano_melody_letter_notes_easy.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zolifibi.rf.gd/file_tidak_bisa_dibuka_di_corel_draw.pdfIn PDF document text
    • https://b760d8db-9746-4821-aa2b-94c9f806d328.filesusr.com/ugd/26ce45_c7a1fbacd8a54d009e5c007da6bb8e31.pdf?index=trueIn PDF document text
    • http://ketanuviz.epizy.com/barnaba_songs_free.pdfIn PDF document text
    • http://xibubixina.epizy.com/xorujujikefewivusugeluve.pdfIn PDF document text
    • http://sobikunukozi.rf.gd/90558319426.pdfIn PDF document text
    • https://fe4fa097-7109-4367-a76b-bc1f2b7936f3.filesusr.com/ugd/ef6f93_0253571b50d24a72b768241ac14360e1.pdf?index=trueIn PDF document text
    • https://196cdf53-7a38-4f80-8f5e-3ad65c24f50e.filesusr.com/ugd/e5a593_af2e10f93600426cabb0efe88aa058e8.pdf?index=trueIn 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_off0000fcc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCC1 5708 bytes
SHA-256: 2db8291880d08681e8fe8c43c206ddd4f2ba7fcbb0ac027526813d7f77df2026
font_01_sfnt_off0001104f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1104F 10660 bytes
SHA-256: 28ca614f2f9021f4f3e58872551d821e3a177120c68c64e9748c9843f068232e

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