Malicious PDF — malware analysis report

Static analysis result for SHA-256 0fb2ce390354d512…

MALICIOUS

PDF

77.4 KB Created: 2021-04-25 00:52:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 88afae367c8bd2833c4ed8238c674c6e SHA-1: dc482b1c8280e6a26bdd01c8ff68ec659dc10549 SHA-256: 0fb2ce390354d512e7b2e232ab3e923b129ccc0fcfc15d48362d6d92594b3557
186 Risk Score

Malware Insights

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

This PDF file functions as a link farm, directing users to numerous external URLs under the guise of search results. The primary lure appears to be 'Washington post crossword puzzles and games', with many linked PDFs containing generic titles. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the PDF structure itself is used to host a large number of potentially malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://pelibifir.ru/strik?utm_term=washington+post+crossword+puzzles+and+games PDF link annotation
    • http://fasekafalig.scienceontheweb.net/1998_polaris_xplorer_400_4x4_owners_manual.pdfIn PDF document text
    • https://cdn.sqhk.co/naludibeg/ghjajeP/adventureland_tickets_cheap.pdfIn PDF document text
    • https://cdn.sqhk.co/jimumakevaji/fwd8zia/mugalogewuwe.pdfIn PDF document text
    • https://cdn.sqhk.co/risubibasero/5icJia8/59744889080.pdfIn PDF document text
    • http://tiwilofojifig.sportsontheweb.net/ge_water_softener_manual.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447271/normal_602af2fd27995.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367687/normal_601fb05bbc03e.pdfIn PDF document text
    • https://cdn.sqhk.co/napumefu/iVkg2eI/fowusopozo.pdfIn PDF document text
    • https://wovupidej.weebly.com/uploads/1/3/4/6/134687137/6382411.pdfIn PDF document text
    • https://cdn.sqhk.co/badiboxa/iiapy5R/balloon_tower_defense_5_free_download.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4499660/normal_6028fbbad9087.pdfIn PDF document text
    • https://kivifakan.weebly.com/uploads/1/3/4/8/134870172/fipeg-garalasax-dodixu-juwalenoleja.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464720/normal_60604df0adcb4.pdfIn PDF document text
    • https://turabevov.weebly.com/uploads/1/3/0/9/130968962/wogoxofiwokaxakit.pdfIn PDF document text
    • https://cdn.sqhk.co/poxudanefisi/jaI3Lhh/osaka_amazing_pass_guidebook.pdfIn PDF document text
    • https://cdn.sqhk.co/mojesoje/gj7icje/pobefij.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zedowep.atwebpages.com/96838823207.pdfIn PDF document text
    • https://e6b56e3c-1b88-4cfb-972d-ab1702b0a06e.filesusr.com/ugd/8c0e65_290aaa947c0c4fbaabad71f4f8c131d6.pdf?index=trueIn PDF document text
    • https://aa700e4b-9450-4a85-8b7e-8c92ffe47626.filesusr.com/ugd/de972d_b3a991e55e5142d19daa56c3e4beaba4.pdf?index=trueIn PDF document text
    • https://7915398d-c9c2-4241-abdb-40cf742e4b8d.filesusr.com/ugd/d4df0f_6504628665544e4f8fd9b5ce3a1a4570.pdf?index=trueIn PDF document text
    • https://d115d978-d96a-40c8-9764-5d959708fc35.filesusr.com/ugd/436160_cdbf72016467429b90eb102afadb0973.pdf?index=trueIn PDF document text
    • https://b1706aec-e9b1-4c6c-9a93-f14ef4a1c402.filesusr.com/ugd/3b47cb_3c6e457b479a482bb7ba511383d467c6.pdf?index=trueIn PDF document text
    • http://fiforeru.atwebpages.com/26244930835.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_off0000ee1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE1F 5644 bytes
SHA-256: b6dd73b0e02e907141d86618c22eb24527424179c7e3c079f774a5de519a5b54
font_01_sfnt_off00010147.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10147 10744 bytes
SHA-256: 82bf89d70500263c68631d73406bdd79903900da14216d06756d360f11c3712d