Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4c8807ce1d25fec…

MALICIOUS

PDF

130.6 KB Created: 2021-03-31 06:19:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: c104c19c5b1e1ae431b7a4ea704c8a14 SHA-1: df3692982c9ee17e4d00b4084d36301c41d2f2b9 SHA-256: a4c8807ce1d25fecb229c154aeb7a3204642fd553a1e10d333fe48d2ce0cc080
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan-like behavior. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the PDF structure strongly suggest an attempt to exploit users through deceptive links, likely as part of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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=richard+ii+shakespeare+text PDF link annotation
    • https://bopilopuneliniw.weebly.com/uploads/1/3/5/3/135304065/a0fb7761d6db6.pdfIn PDF document text
    • https://kagejiwuj.weebly.com/uploads/1/3/4/0/134095923/vutevamuru.pdfIn PDF document text
    • http://kovuzaxaf.medianewsonline.com/wopav.pdfIn PDF document text
    • https://kozitasulama.weebly.com/uploads/1/3/4/6/134647404/derexol.pdfIn PDF document text
    • https://kazefapakoj.weebly.com/uploads/1/3/4/6/134644741/1735560.pdfIn PDF document text
    • http://wowezixuxaxu.22web.org/bach_busoni_chaconne_piano.pdfIn PDF document text
    • http://tetoxukipim.getenjoyment.net/medical_experience_certificate_format.pdfIn PDF document text
    • https://levibaxa.weebly.com/uploads/1/3/1/4/131408620/saduvof.pdfIn PDF document text
    • https://jifalutisapore.weebly.com/uploads/1/3/4/7/134772579/4794642.pdfIn PDF document text
    • https://fusesekomufe.weebly.com/uploads/1/3/1/6/131606177/6642475.pdfIn PDF document text
    • http://xisumagogali.getenjoyment.net/january_2020_printable_calendar.pdfIn PDF document text
    • http://silekutum.medianewsonline.com/kananelunovijori.pdfIn PDF document text
    • http://luloxijemise.medianewsonline.com/54016428814.pdfIn PDF document text
    • http://tufodudem.mypressonline.com/boy_scouts_popcorn_order_form_2019.pdfIn PDF document text
    • https://nokajavu.weebly.com/uploads/1/3/0/9/130969653/592163.pdfIn PDF document text
    • http://sukutoxuwurif.mywebcommunity.org/dufotekizanonarim.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://ad858f6a-7bbb-416d-9365-e04d7986ed9b.filesusr.com/ugd/3c9ac1_439c28cfb72c441b9dbb556ab2596e87.pdf?index=trueIn PDF document text
    • https://28a90398-13b1-4b58-b54c-ed045a6bddf2.filesusr.com/ugd/7e9e1f_5b1d12be107b4c5cbb4b77541b0e1777.pdf?index=trueIn PDF document text
    • https://d80868e2-5d34-4dda-9345-0396294a35aa.filesusr.com/ugd/f9fac6_fb10c00b2f2b4739813fa70740150161.pdf?index=trueIn PDF document text
    • https://39c1d623-eccb-4af0-a86a-15328a2d61f9.filesusr.com/ugd/3cb6cb_de90f5bbc411406cbfc874a8d0aa8d54.pdf?index=trueIn PDF document text
    • http://jomopizemiz.onlinewebshop.net/silk_ribbon_embroidery_stitches.pdfIn PDF document text
    • https://d8d078ea-10ec-4787-8e21-ef6e32b87a24.filesusr.com/ugd/8f6098_35f62ababdec4a7b9d3ea3d153f9616a.pdf?index=trueIn PDF document text
    • http://livirava.atwebpages.com/behringer_xenyx_x1204usb_driver_windows_10.pdfIn PDF document text
    • http://puzagivo.epizy.com/les_miserables_musical_songs_bring_him_home.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_off0001c39c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C39C 5268 bytes
SHA-256: 5f5bb42924a344beea82fcf6e206c7524f63bfc47c3e7b519c9ba6bbfb61100d
font_01_sfnt_off0001d586.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D586 11528 bytes
SHA-256: 143d432323b7cd7f846b9fc3e25bcaf9dd57dea778ace262266b2f3282aca9f7