Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb0455d85ef40a87…

MALICIOUS

PDF

77.6 KB Created: 2021-03-14 22:57:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 79a09b2d02b83fecbb71d91d2619c07c SHA-1: 7338978daeade31a88cf3f673d4c5ed2349caf97 SHA-256: eb0455d85ef40a8795baa0104a39c84e7bc8fba4ef8204a43ea6709847365d8e
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to disposable domains, indicative of a link farm designed to host malicious content or phishing pages. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links are consistent with techniques used to redirect users to malicious sites.

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://ponafet.ru/wix?keyword=manejadores+de+base+de+datos
    • http://goodxday.xyz/how_to_fix_my_maytag_bravos_dryer4ibhk.pdf
    • https://static.s123-cdn-static.com/uploads/4410217/normal_5ffb207490a54.pdf
    • http://like-store.site/puvuv2q59w.pdf
    • http://delinapod.mypressonline.com/mevadolurotusax.pdf
    • http://dusanaputojinon.mygamesonline.org/lenuzak.pdf
    • http://logefekur.22web.org/9511095417.pdf
    • http://jisutuxoxaza.medianewsonline.com/tawugefo.pdf
    • https://cdn-cms.f-static.net/uploads/4404745/normal_602de6ee18405.pdf
    • https://static.s123-cdn-static.com/uploads/4365656/normal_6001d581aed55.pdf
    • http://good-production18.site/how_long_does_it_take_to_cook_a_turkey_breast_on_a_rotisserieoy0vl.pdf
    • http://leadtop.co/maturafajc97bg.pdf
    • http://dudoxanudito.scienceontheweb.net/81607202464.pdf
    • https://cdn-cms.f-static.net/uploads/4475565/normal_60484cb41d75f.pdf
    • http://xrootunited.com/intercessory_prayers_for_the_churche2au9.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/tumasun/optimization_of_phenol-_chloroform_rna_extraction.pdf
    • https://s3.amazonaws.com/devuxuzejozam/wototuvefolapif.pdf
    • https://s3.amazonaws.com/gedexim/tutorial_autocad_electrical_2018_espaol.pdf
    • http://xagaketukije.rf.gd/limpopo_weather_report.pdf
    • https://s3.amazonaws.com/wezukep/80100848031.pdf
    • http://girofili.myartsonline.com/what_habitat_does_a_white_tiger_live_in.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f311.bin
8a3cb7221813a83995a750e1593867fcef91b73f674723a21bf5d88678f09fce		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF311 5008 bytes
font_01_sfnt_off00010432.bin
41e6ce209eb92318bea2429aca1b4c84edcde18c55f9a4de0d95c74d1247b7c2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10432 11412 bytes

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