Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b05c5d7944d195b…

MALICIOUS

PDF

78.1 KB Created: 2021-03-20 18:57:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: b14bd5c8a66bb84a9592ff65ed287528 SHA-1: 1edad8c9d382e85165545a2df97cc466bf1dfbca SHA-256: 2b05c5d7944d195b7e1eff58793708597e89bcfff02ccf89bed5162a79899c52
126 Risk Score

Malware Insights

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

The PDF document is identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable hosting, suggesting a link farm designed to redirect users. The document body, though heavily obfuscated, contains text related to 'Cours sur la cirrhose du foie. pdf', indicating a lure to disguise the malicious intent of redirecting to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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/award?keyword=cours+sur+la+cirrhose+du+foie.+pdf PDF link annotation
    • https://cdn.sqhk.co/gorigaserata/Epgehi1/lucky_block_mod_for_minecraft_pe_1._16.pdfIn PDF document text
    • https://cdn.sqhk.co/xadowififux/ejhkge5/brochure_design_cdr_file_free.pdfIn PDF document text
    • https://cdn.sqhk.co/lilomovetum/dEBhahd/smithsonian_channel_new_shows.pdfIn PDF document text
    • http://xuvivok.22web.org/7338418775.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4447658/normal_5fe2e7c836eaf.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4402244/normal_6004bc8e51147.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410217/normal_5fd1002467b67.pdfIn PDF document text
    • https://cdn.sqhk.co/filodomazora/icjbjiM/31255624717.pdfIn PDF document text
    • https://cdn.sqhk.co/wuvevevef/aJ1CkIA/fallout_shelter_wiki_weapons.pdfIn PDF document text
    • http://lnstagramcopyrighthelps.com/sharp_xe-a102_till_manualevgtz.pdfIn PDF document text
    • https://cdn.sqhk.co/regisanozoxo/ghjdjhC/format_of_writing_a_technical_report.pdfIn PDF document text
    • http://ludugomawetus.22web.org/wukifevatiwite.pdfIn PDF document text
    • https://cdn.sqhk.co/wogokodu/ibiciiw/murder_hornets_washington_state_university.pdfIn PDF document text
    • https://cdn.sqhk.co/zoribakim/3hdYggD/cbse_result_2018_class_10_marksheet.pdfIn PDF document text
    • https://cdn.sqhk.co/vavetiset/ogfjahd/purezepudako.pdfIn PDF document text
    • http://paganel.world/fubexidulubitugete3tm.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4460449/normal_5fcc7f1069311.pdfIn PDF document text
    • http://dezlice.ru/526587751395jvqh.pdfIn PDF document text
    • https://cdn.sqhk.co/vawadawuleja/bPGggha/76641815272.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/wifiduxezo/neuraxial_guidelines_anticoagulation.pdfIn PDF document text
    • http://paxajuleki.rf.gd/gewazibibekofogeteka.pdfIn PDF document text
    • https://s3.amazonaws.com/sosupejuxofedo/kenezatizupozit.pdfIn PDF document text
    • https://s3.amazonaws.com/sojuravewi/best_private_android_browser_2019.pdfIn PDF document text
    • https://s3.amazonaws.com/mojivikapeti/kisupow.pdfIn PDF document text
    • http://gasezeru.epizy.com/saipa_logbook_guide_2019.pdfIn PDF document text
    • https://s3.amazonaws.com/jeworurowam/black_angus_dinner_menu.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_off0000effa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFFA 5180 bytes
SHA-256: 66e5595ad6d8371e1afb28b8ba3a9f27b643c92bf438b0bd4cb5040dbcf00296
font_01_sfnt_off00010190.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10190 12692 bytes
SHA-256: 26d69f68d8a887976034af43d8e9ff9e219126f2edecacd7d4e4aae4906a2031

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