Malicious PDF — malware analysis report

Static analysis result for SHA-256 39a317d49233243f…

MALICIOUS

PDF

79.6 KB Created: 2021-03-01 04:58:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: d0e7aa1178b8bc9b937af048e76eaae8 SHA-1: 7ffb9574a4938ea73515b9321d341d780bd6ce8e SHA-256: 39a317d49233243f8acfb01d76fff0fe7853f9732a1bb1b1ee705557093671c5
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external URLs, many of which are hosted on disposable domains, suggesting a link farm or redirection infrastructure. The document body, though heavily obfuscated, contains metadata related to 'wkhtmltopdf' and a query about 'iatf meaning', indicating a potential lure to external content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://druttle.ru/award?keyword=what+does+iatf+mean PDF link annotation
    • http://rolevuses.iblogger.org/1516727104.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383688/normal_600d80b063665.pdfIn PDF document text
    • https://cdn.sqhk.co/vakolitakap/dzmbhia/color_quest_matching_gameboy.pdfIn PDF document text
    • http://rupukimonedekij.22web.org/invisible_man_2020_movie_review.pdfIn PDF document text
    • http://verifedform.com/basher_sabertooth_manuallqz3o.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4378160/normal_5fe2a1d73a23f.pdfIn PDF document text
    • http://termometr-medikal.site/rirakiriporivaxs3h96.pdfIn PDF document text
    • http://retys.space/uniform_boundedness_conditiont9seu.pdfIn PDF document text
    • https://cdn.sqhk.co/nivabetaz/iepUEja/13959888724.pdfIn PDF document text
    • http://kiwenalod.medianewsonline.com/what_is_sociological_imagination_and_examples.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420604/normal_5feb392502418.pdfIn PDF document text
    • http://rezonansmusic.com/ancient_greece_timeline_lessonpy91w.pdfIn PDF document text
    • http://rajukilodagoje.mygamesonline.org/6821110306.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470040/normal_5fcf9fe4dab5b.pdfIn PDF document text
    • https://cdn.sqhk.co/surodamiz/594rbfs/smithsonian_channel_air_disasters_imdb.pdfIn PDF document text
    • http://vvvvvvvvvvvvvvvvvvvvvb.xyz/lego_grand_piano_price_malaysiacabtb.pdfIn PDF document text
    • https://cdn.sqhk.co/tuxonewebuke/idChfPC/jarixuk.pdfIn PDF document text
    • http://medebupima.sportsontheweb.net/2019_sv650_service_manual.pdfIn PDF document text
    • http://servicesforsupport.com/jefotapugalifadold5sg.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://duxepivol.myartsonline.com/30017066400.pdfIn PDF document text
    • http://xezimid.epizy.com/biwozazoga.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_off0000f929.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF929 5032 bytes
SHA-256: 49880f82dcc58e1e5009425f426e169540b8b69a590977218594590225fbc3af
font_01_sfnt_off00010a35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A35 11280 bytes
SHA-256: ca6e7448fe7ff737a4406946363a46aaccfdb7d176bb2311759986edc480579a

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