Malicious PDF — malware analysis report

Static analysis result for SHA-256 41fb0a771bec99c0…

MALICIOUS

PDF

74.3 KB Created: 2021-03-26 17:42:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: a6fa2d01d52609b5d1bf8871df808573 SHA-1: b112965240c6672caf24c336af481594c7dba002 SHA-256: 41fb0a771bec99c02dba78971b86a2fdbd542aea7aa7c76a3d9f4a656473ed29
126 Risk Score

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. The PDF contains a large number of embedded URIs, many pointing to disposable domains, suggesting a link farm or phishing lure. The presence of external URIs and the ML classification strongly suggest this PDF is designed to redirect users to malicious sites for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://fokemale.ru/wix?keyword=ap+chemistry+stoichiometry+review+worksheet PDF link annotation
    • http://omshop.space/puzzles_and_dragons_apk_modxi8qm.pdfIn PDF document text
    • http://pe50off.info/51718196109tu2hi.pdfIn PDF document text
    • https://cdn.sqhk.co/gekobegij/VTI6XxL/noise_level_meter_software_free_download.pdfIn PDF document text
    • https://cdn.sqhk.co/linidivez/agdicgh/oreo_ice_cream_cake_recipe_uk.pdfIn PDF document text
    • https://cdn.sqhk.co/verexoleki/djiABic/sofegujiwonavopikegi.pdfIn PDF document text
    • http://vobalemujumojak.mywebcommunity.org/the_god_who_is_there_da_carson.pdfIn PDF document text
    • https://cdn.sqhk.co/zokuzadisup/hghhibI/69659199289.pdfIn PDF document text
    • https://cdn.sqhk.co/sujubowip/hjgfD9k/nbc_sports_network_premier_league_commentators.pdfIn PDF document text
    • http://komozazene.getenjoyment.net/eau_guidelines_prostate_cancer_2020.pdfIn PDF document text
    • http://lazebusotidedof.22web.org/jonupijotamawuw.pdfIn PDF document text
    • http://tortomsk.ru/954634893216e4lp.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://dukejujegu.epizy.com/ppsspp_anime_games.pdfIn PDF document text
    • http://fawipiro.rf.gd/virtue_theory.pdfIn PDF document text
    • http://sisakuwoxamale.rf.gd/the_three_body_problem_novel_synopsis.pdfIn PDF document text
    • http://kinapemib.rf.gd/meruxokajewiwagav.pdfIn PDF document text
    • http://vuzonulegi.rf.gd/negimekozoxegi.pdfIn PDF document text
    • http://rabelinowizufe.myartsonline.com/11679613193.pdfIn PDF document text
    • https://s3.amazonaws.com/rogugagatuf/what_is_terminal_settling_velocity_of_a_particle.pdfIn PDF document text
    • https://s3.amazonaws.com/divexikav/ti_nspire_cx_emulator.pdfIn PDF document text
    • http://xofududegotu.epizy.com/58192633492.pdfIn PDF document text
    • http://kediditu.rf.gd/coreldraw_x7_with_keygen_free_utorrent.pdfIn PDF document text
    • http://kepofif.onlinewebshop.net/vufidenazobinoj.pdfIn PDF document text
    • http://parapaxesu.rf.gd/public_finance_act.pdfIn PDF document text
    • https://s3.amazonaws.com/lunojol/gezopiliba.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_off0000e496.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE496 5240 bytes
SHA-256: edce83a194d9a9e4d4f17e8c3ca35fb4fcf45d638ab1e74f2e501cac1907d8ba
font_01_sfnt_off0000f65a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF65A 11252 bytes
SHA-256: 0cf952d11b7d8ee2db960d309ca99d78d3598e01ce750de9d7f152c0cf16d38d

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