Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f553797e786c590…

MALICIOUS

PDF

76.7 KB Created: 2021-03-14 08:07:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 43bd40305bf705f8064b828a79d7b2ed SHA-1: 1f0d397970916ce59cb39570380ec76beb2c03fb SHA-256: 5f553797e786c59066ad2b3d0a69423e777f7672dfe224cb5d445588581d1ce8
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to disposable domains and are structured as a link farm. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the presence of multiple unknown reputation URLs strongly suggest a phishing or malicious redirection attempt. The ML classifier and ClamAV detection further confirm the malicious nature of the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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/strik?utm_term=missing+411+books+used PDF link annotation
    • http://taforojujutusig.mygamesonline.org/reliance_606_water_heater_element_part_number.pdfIn PDF document text
    • http://tulomodev.getenjoyment.net/teaching_music_through_performance_in_band.pdfIn PDF document text
    • http://pewekelexu.mygamesonline.org/mapa_brujas_belgica.pdfIn PDF document text
    • http://puvinizozibejir.mygamesonline.org/toxalametilodunubuw.pdfIn PDF document text
    • https://baxemazone.weebly.com/uploads/1/3/0/7/130739829/8116616.pdfIn PDF document text
    • https://lupilonugugi.weebly.com/uploads/1/3/1/6/131637558/derad.pdfIn PDF document text
    • http://pibarulajido.getenjoyment.net/dipibojefolurevu.pdfIn PDF document text
    • http://ladujose.sportsontheweb.net/lobisidasefozexubi.pdfIn PDF document text
    • https://joverukaded.weebly.com/uploads/1/3/4/4/134433057/folawilomugi.pdfIn PDF document text
    • https://cdn.sqhk.co/fonizijodi/Aihy9jh/hd_camera_for_laptop_price.pdfIn PDF document text
    • https://cdn.sqhk.co/pugusomimoro/iidFhee/ant_colony_optimization_numerical_example.pdfIn PDF document text
    • https://tijagure.weebly.com/uploads/1/3/1/3/131398232/9998818.pdfIn PDF document text
    • https://komanogorolelew.weebly.com/uploads/1/3/1/3/131380356/8708625.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tuxefunuzire.atwebpages.com/63858575419.pdfIn PDF document text
    • http://loxosuzejix.epizy.com/how_to_fall_in_love_with_life_cecelia_ahern.pdfIn PDF document text
    • http://pimifemegizak.epizy.com/58414858271.pdfIn PDF document text
    • http://namutogenasokab.epizy.com/xuravavuvaraze.pdfIn PDF document text
    • http://pisironebininuw.rf.gd/bojefosat.pdfIn PDF document text
    • http://rigirulame.epizy.com/diary_of_a_wimpy_kid_4_full_movie_online_free.pdfIn PDF document text
    • http://gemebewi.rf.gd/donok.pdfIn PDF document text
    • http://fabibobitobabo.epizy.com/isabel_allende_la_ciudad_de_las_bestias_trilogia.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_off0000ef98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF98 5004 bytes
SHA-256: 48b2e8e7edd2f2c3ff19d63f697ba90e26d7eaed137b7293f5b380583338dbb3
font_01_sfnt_off000100cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100CD 10888 bytes
SHA-256: 764de420b9715830515d866e3fbb9ab641a0bfe25f5ab2e75c4935e7fcf7c1c6

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