Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a39ef6367f43623…

MALICIOUS

PDF

145.9 KB Created: 2021-02-06 17:13:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 06c8b9fed59d970d91025f7c64cd3190 SHA-1: ffcbb04eca30403caf814b87df657d604d876259 SHA-256: 2a39ef6367f43623207b39b5296e54fa1a49974454a7d386aba62680fcccff5e
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm or phishing lure. The presence of 'utm_term' in one URL further supports a phishing or malicious redirection scheme.

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://jacksth.ru/aws?utm_term=christian+audio+songs+free++tamil PDF link annotation
    • http://manekobe.22web.org/punctuation_rules_in_english_grammar.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379615/normal_5fdfa3eb461a2.pdfIn PDF document text
    • https://cdn.sqhk.co/vasinabew/aGghlHC/gukaxad.pdfIn PDF document text
    • http://verification-help.business/hachiya_persimmon_zonevosu9.pdfIn PDF document text
    • http://mpvideo.org/property_and_casualty_insurance_study_guide_texas93xh4.pdfIn PDF document text
    • https://cdn.sqhk.co/dalegoti/Wgigchb/42154749204.pdfIn PDF document text
    • http://tublitalia.space/los_picapiedra_xxxdjzoz.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408719/normal_5ffac822edbfa.pdfIn PDF document text
    • http://trastenmyqort.online/sketchy_pharmacologyfzxwx.pdfIn PDF document text
    • https://cdn.sqhk.co/zidexamuwela/gcjbihg/42345875561.pdfIn PDF document text
    • http://gonzo-3d.com/frosty_ice_cream_rural_valley_paif2yp.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380536/normal_5fde64f4cde7d.pdfIn PDF document text
    • https://cdn.sqhk.co/vilitemeru/jcidif1/pac_12_championship_game_2019_time.pdfIn PDF document text
    • https:///\/a10.gaanacdn.com\/images\/albums\/22\/69922\\crop_175x175_69922.jpg,albumtitle:TamilIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zarevarepi.epizy.com/68410667538.pdfIn PDF document text
    • http://bawulega.rf.gd/geographic_information_systems_and_remote_sensing.pdfIn PDF document text
    • http://zukavinu.rf.gd/report_cars_parked_on_double_yellow_lines.pdfIn PDF document text
    • http://punejiva.epizy.com/blush_color_formal_shoes.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_off00020251.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x20251 5228 bytes
SHA-256: 7a35bdf6d2d5b825bb9e0ca23dea27c15f91c90bdc3975291ca652f1c31ec674
font_01_sfnt_off000213e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x213E9 11508 bytes
SHA-256: 84aef928a7d420a92a5d6d9b13ee301f9a1de77568e61de17ad2150b48277fc6

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