Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a35ac93fd45a496…

MALICIOUS

PDF

98.0 KB Created: 2021-05-17 00:10:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 45265f5a9e77a9d59ae6433fa442a802 SHA-1: d724710795bbc4b6e9ecae3b3de3aa63967da762 SHA-256: 2a35ac93fd45a4961c228b2d851574d12005f2a3c21ab4c591b17dcd27a7c241
126 Risk Score

Malware Insights

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

The PDF document was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to disposable domains and link farms, suggesting a phishing or malware distribution scheme. The presence of external URIs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic strongly support this attack pattern.

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://resalured.ru/strik?utm_term=avon+m50+gas+mask+bag
    • http://triple-doska3.club/50012531875d81sw.pdf
    • http://xukosususif.medianewsonline.com/40767425203.pdf
    • http://cooldomen.space/focusrite_scarlett_2i2_microphone_reviewa3ov4.pdf
    • https://cdn.sqhk.co/petebeki/9hchdhe/20154238361.pdf
    • http://pedaxofanor.mywebcommunity.org/78434428291.pdf
    • http://vufajed.getenjoyment.net/40220805035.pdf
    • http://compte-cmbretagne.best/go_tell_it_on_the_mountain_novel_charactersjsmqe.pdf
    • https://cdn.sqhk.co/budajawisore/pgjXUjg/fujibipewonuratemired.pdf
    • http://lnstagram-helping-centre.com/char_griller_akorn_6520_manualg2zo8.pdf
    • http://vittorguxx.site/bavawikopujividaditodubok3coar.pdf
    • http://sewawena.scienceontheweb.net/71050831599.pdf
    • http://flathead.us/first_alert_smoke__carbon_monoxide_alarm_installation4fyju.pdf
    • http://qrastenmap.online/harga_tv_led_panasonic_viera_42_inch_aquap3w4x.pdf
    • http://in-arenas.com/if_and_unless_grammar_exercises58umt.pdf
    • http://bikomowaxibujoj.medianewsonline.com/kesiso.pdf
    • http://easterthjg.com/who_is_the_strongest_emperor_in_one_pieceqyoip.pdf
    • http://hayatevesigar.online/heat_and_mass_transfer_book_by_yunus_cengel5gri2.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://dasobiviwadodaj.atwebpages.com/how_fast_to_run_5k_in_20_minutes.pdf
    • http://dapizodipe.myartsonline.com/guia_ceneval_acuerdo_286_gratis.pdf
    • http://zaduzos.myartsonline.com/definition_of_business_research.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013252.bin
f24418afde991e348e9fa02a9bcaee3fbd18cde993421a29031e4c00fc50a885		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13252 3048 bytes
font_01_sfnt_off00013d2d.bin
5a00b7ca4fef801ef2b15d041edab0686289b41e1169aa7a46268b279a4fd1f2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13D2D 5396 bytes
font_02_sfnt_off00014f88.bin
a7d3e2dd3fdc6de0ec88a095182786b9678c5878c0e2af77a80b4264268dd7fc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14F88 15408 bytes

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