Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f751aadc0c91ed9…

MALICIOUS

PDF

78.6 KB Created: 2021-03-14 19:57:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 908e4552025c61dcd448740cc7567754 SHA-1: 4d30cebc2214dfeef8724195b325dd8359b87a49 SHA-256: 2f751aadc0c91ed918061b572dffe29b9fec4f2a495021a9b558622a18c2a64c
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicative of a link farm or SEO manipulation tactic. ClamAV and ML classifiers flagged the PDF as malicious, specifically as a phishing trojan. While no scripts were extracted, the structure and URL patterns suggest the document is designed to lead users to potentially malicious or deceptive content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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/award?keyword=aptitude+questions+on+percentage+with+solutions+pdf PDF link annotation
    • https://cdn.sqhk.co/rilixuzewiv/Dsvdvje/ben_10_alien_swarm_villains_wiki.pdfIn PDF document text
    • https://cdn.sqhk.co/terodekijur/9Ajshha/xaruzeluxejesem.pdfIn PDF document text
    • https://cdn.sqhk.co/veleviziwew/jaicibe/36978280292.pdfIn PDF document text
    • https://cdn.sqhk.co/fejovuwov/irehhjj/marketing_definition_business_environment.pdfIn PDF document text
    • https://kevapesezivobi.weebly.com/uploads/1/3/4/8/134893959/ruzevipi.pdfIn PDF document text
    • https://cdn.sqhk.co/tubafejog/S8GHvPB/10483629887.pdfIn PDF document text
    • http://durasazi.iblogger.org/got_battle_of_bastards.pdfIn PDF document text
    • https://cdn.sqhk.co/jegamaxegev/hbjgAko/pipusewuvogepalid.pdfIn PDF document text
    • https://fimedezederuru.weebly.com/uploads/1/3/4/8/134884956/e02801a1d68.pdfIn PDF document text
    • https://fukenotaza.weebly.com/uploads/1/3/2/7/132740373/1585563.pdfIn PDF document text
    • https://kajuzenutojaso.weebly.com/uploads/1/3/4/6/134631714/8740214.pdfIn PDF document text
    • https://cdn.sqhk.co/dofofigeniso/WFqibZ7/dungeon_keeper_mobile_review.pdfIn PDF document text
    • https://cdn.sqhk.co/kusewupudin/hed9jet/chicago_weather_tomorrow_snow_inches.pdfIn PDF document text
    • https://cdn.sqhk.co/zeliravepuj/dDhjwhf/chest_simulator_for_cr_mod_apk.pdfIn PDF document text
    • https://nuguzawopaji.weebly.com/uploads/1/3/4/0/134040365/sipep-demanujigunewiz-jowebovapinox.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/fulazelof/50th_laws_of_power_list.pdfIn PDF document text
    • http://minazefawubiso.epizy.com/what_is_the_best_mini_fridge_for_a_dorm.pdfIn PDF document text
    • https://s3.amazonaws.com/ratixifo/riwapibofadupajifeger.pdfIn PDF document text
    • https://s3.amazonaws.com/rudelazifizuvo/blank_massage_gift_certificate_template.pdfIn PDF document text
    • http://wijobofeforot.epizy.com/68076484509.pdfIn PDF document text
    • https://s3.amazonaws.com/kakekojezutok/ts_16949_iatf_16949_difference.pdfIn PDF document text
    • https://s3.amazonaws.com/dixaleko/sense_and_sensibility_movie_cast.pdfIn PDF document text
    • http://josusasufuni.epizy.com/35889969150.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_off0000f189.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF189 5624 bytes
SHA-256: 39ca699fd624313f9e528c5ca1619a53a4a5e57f39024fe70a4291c22c17d38d
font_01_sfnt_off000104b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104B4 12008 bytes
SHA-256: f1a9596eab8a203923c7af07cb1d8117bfc2747848db00b2ed73c7661ad7a770