Malicious PDF — malware analysis report

Static analysis result for SHA-256 a276e1bbb440adfa…

MALICIOUS

PDF

158.1 KB Created: 2021-03-03 22:26:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: fd48901994143b2b8f48a4e6bf075982 SHA-1: 73bf0430e18200a9518a3cf71b4917d697e9b2a5 SHA-256: a276e1bbb440adfad0be9d3e3db05fbd9dfcb005e6c03719162034ce556d456a
126 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external URIs and embedded URLs pointing to disposable hosting and link farms, indicating an attempt to redirect users to malicious sites. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, suggesting the PDF is part of a link farm designed for SEO manipulation to distribute malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://baarspo.ru/wix?keyword=temperate+woodland+and+shrubland+biome+soil+type PDF link annotation
    • http://nisaledax.iblogger.org/xuwamizujamixufejolibi.pdfIn PDF document text
    • https://zezupivipikoko.weebly.com/uploads/1/3/4/5/134596705/165873.pdfIn PDF document text
    • https://buzoraxuv.weebly.com/uploads/1/3/4/3/134366179/346805.pdfIn PDF document text
    • https://cdn.sqhk.co/xexisini/dhgbgdV/truck_driver_free_game_download.pdfIn PDF document text
    • https://cdn.sqhk.co/zewumirapeb/igLhcif/gunegenevezaduwivobi.pdfIn PDF document text
    • https://cdn.sqhk.co/sozodumupof/gij7O4Z/nusafasaxuwedagopuge.pdfIn PDF document text
    • https://gimiduti.weebly.com/uploads/1/3/4/7/134711596/96411.pdfIn PDF document text
    • https://cdn.sqhk.co/fuwuwoki/a6hiRjg/dentist_lisa_bentley.pdfIn PDF document text
    • https://cdn.sqhk.co/pufowuvikij/vejfjfu/97329583300.pdfIn PDF document text
    • https://cdn.sqhk.co/nesuxozajek/iM7OjjP/kobijevoxezoxekano.pdfIn PDF document text
    • http://javebamugizal.66ghz.com/56138566031.pdfIn PDF document text
    • http://sosiwawivijomo.scienceontheweb.net/lepelubamid.pdfIn PDF document text
    • https://cdn.sqhk.co/tabakotodi/sejaico/32498979771.pdfIn PDF document text
    • https://fefodenajefive.weebly.com/uploads/1/3/1/4/131437461/d4c57d5f4.pdfIn PDF document text
    • https://cdn.sqhk.co/lajawawinu/BqgScgi/fezedosenalarebupodebuki.pdfIn PDF document text
    • https://cdn.sqhk.co/kufomopinu/gFiehct/dino_escape_dinosaur_game.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://benamow.myartsonline.com/nixon_unit_40_black.pdfIn PDF document text
    • http://fuvojofud.epizy.com/tisajugogevaxuwuzosub.pdfIn PDF document text
    • http://kakogajoxe.epizy.com/netenizobega.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_off000232b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x232B1 5480 bytes
SHA-256: 4932ac42bb37c20949b030d4889ca99dc1e7c5d780bd60ff71a18670ca684af0
font_01_sfnt_off00024532.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x24532 11360 bytes
SHA-256: 7e1ca8218e7eec3ebe76fdac2ae3e04c70f0481edde860058e5ec55d73b2d7a8

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