Malicious PDF — malware analysis report

Static analysis result for SHA-256 34bea98873f0e886…

MALICIOUS

PDF

88.3 KB Created: 2021-02-27 21:09:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 77a1059fce0a5005ff37b2aca33b8dc1 SHA-1: 243e8b8fb47273cea26d7c0b7efb64f9590fa252 SHA-256: 34bea98873f0e886ce3b377df5a756b97933d6c59be2eb12f20c641212199df7
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains and link farms, indicating a phishing or malware distribution attempt. ClamAV and ML classifiers flagged this file as malicious, specifically as a phishing trojan. The presence of external URIs and the link farm heuristic strongly suggest an attempt to redirect users to malicious sites.

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://jacksth.ru/123?utm_term=2006+bmw+e90+330i+engine PDF link annotation
    • https://cdn.sqhk.co/gejikofoxaf/IhEushd/zigakupuzexorexuxerob.pdfIn PDF document text
    • https://cdn.sqhk.co/gapebeve/hHuhcGf/nuzusorazuzesobaposipo.pdfIn PDF document text
    • https://cdn.sqhk.co/metexemoraga/SgiBg4j/simuxujuterolosenodewiga.pdfIn PDF document text
    • https://cdn.sqhk.co/rojarimeg/giGDijI/3765472211.pdfIn PDF document text
    • http://zawomuxe.iblogger.org/group_website_template.pdfIn PDF document text
    • https://cdn.sqhk.co/wadelovelo/cgiNggU/90586054625.pdfIn PDF document text
    • https://cdn.sqhk.co/majumoros/jiyjbic/bisedevaturugonawanepifik.pdfIn PDF document text
    • https://cdn.sqhk.co/namemedoxake/cWQxuhe/60024313888.pdfIn PDF document text
    • http://falenubodopo.22web.org/hair_salons_open_today_near_me.pdfIn PDF document text
    • https://cdn.sqhk.co/vedisaso/G2iiTjb/wwe_battlegrounds_switch_update.pdfIn PDF document text
    • https://cdn.sqhk.co/miviluwulux/IjiRKhe/weather_station_for_storm_chasers.pdfIn PDF document text
    • https://cdn.sqhk.co/sofopiro/4ibxPii/the_war_for_the_west_free_apk.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • http://difezazimo.rf.gd/zejuruwiduvixanizuper.pdfIn PDF document text
    • http://xizokokov.epizy.com/love_yourself_answer_iphone_wallpaper.pdfIn PDF document text
    • http://tumapaluk.rf.gd/rational_functions_examples_with_answers_real_life.pdfIn PDF document text
    • http://wetowotupime.rf.gd/winrar_latest_version_for_windows_7.pdfIn PDF document text
    • http://jafimelivif.rf.gd/manual_breast_pump_brands_philippines.pdfIn PDF document text
    • http://pudekixepubaz.epizy.com/19566891356.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f754.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF754 5376 bytes
SHA-256: 161cfea1cbc2ed5894382050d850c2e0f2afb45266b2714bd5f5f4e3fae02dd4
font_01_sfnt_off000109a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109A2 11308 bytes
SHA-256: 297b3fc1c2b12b5f07f5703ceb3eca8d9a72fd0ff805b49959085d618d257f80
font_02_sfnt_off00012f78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F78 16092 bytes
SHA-256: 9af6fc3bf9d751f70540aea0fa47faa159a3604992cda23d2adcda3ffc5346b2
font_03_sfnt_off0001447b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1447B 3872 bytes
SHA-256: 26006488cb6f93938a631daa5df4d6e75c43b19baec152d88ecacf7f921b90ce

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