Malicious PDF — malware analysis report

Static analysis result for SHA-256 9826440d50130535…

MALICIOUS

PDF

70.8 KB Created: 2021-02-19 13:50:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 899980fc5f828c815cc704a5ecd6a0b5 SHA-1: 9556125dacfef2ea6be266a90c70dc08ce0d7076 SHA-256: 9826440d501305355c91f282a3f146ec50f461aba7d4f1cf63c71b87a35ce6d3
126 Risk Score

Malware Insights

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

The PDF contains multiple external URIs, with one specifically identified as a link farm on disposable hosting, indicating a malicious intent to redirect users. The ML classifier and ClamAV detection strongly suggest this PDF is malicious, likely a phishing or trojan delivery mechanism. Although no scripts were explicitly extracted, the presence of numerous obfuscated URLs and the heuristic findings point towards an attack pattern involving redirection to malicious sites.

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://maypoin.ru/123?utm_term=formato+de+arrendamiento+de+casa+sencillo PDF link annotation
    • https://cdn.sqhk.co/jotepomi/l5ihOSL/72409845408.pdfIn PDF document text
    • https://cdn.sqhk.co/wezokobuli/jMnBjjt/navukikujifetowemodow.pdfIn PDF document text
    • http://nujibexadubixup.iblogger.org/20899356348.pdfIn PDF document text
    • http://navewezaninub.iblogger.org/jozelamatuf.pdfIn PDF document text
    • http://kafologegodudo.iblogger.org/utorrent_ing_slow_on_windows_10.pdfIn PDF document text
    • https://cdn.sqhk.co/zativojor/MgjyFjf/kodiak_island_real_estate.pdfIn PDF document text
    • https://cdn.sqhk.co/vazoguzo/gcjagfp/epic_race_3d_hack_apk_download.pdfIn PDF document text
    • http://helplnstagramcontact6088756.com/bovojesexibowelub5kmf.pdfIn PDF document text
    • https://cdn.sqhk.co/janawezexoj/igdIgci/business_insider_logo_png.pdfIn PDF document text
    • https://cdn.sqhk.co/vujagefamig/hgLjbha/do_cats_destroy_stuffed_animals.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wosolebaxuwutux.rf.gd/27687184510.pdfIn PDF document text
    • http://kanisal.epizy.com/android_studio_language_injection_settings.pdfIn PDF document text
    • http://potopaf.epizy.com/68375901791.pdfIn PDF document text
    • http://fobukisa.rf.gd/xotuvujezonolelopixox.pdfIn PDF document text
    • http://pisironebininuw.rf.gd/bixogisapixinatinovuga.pdfIn PDF document text
    • http://jewikotadukusug.rf.gd/27244014231.pdfIn PDF document text
    • http://dokedajonanumi.rf.gd/45763044005.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_off0000d416.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD416 5040 bytes
SHA-256: 53c6a9a054eb2dd69f316de1754584e01619ae2d89d10cf72dd5ebfdbc7865c9
font_01_sfnt_off0000e51f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE51F 12388 bytes
SHA-256: ac92fc3e5d813ea6060749e9a24e1e6ce9d5abb2e3c327d89e3eb4a80383c2c7

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