Malicious PDF — malware analysis report

Static analysis result for SHA-256 8209282fc3f33184…

MALICIOUS

PDF

66.3 KB Created: 2021-04-05 15:03:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fd2555d6982c75f3b3042dbc3ed51cb0 SHA-1: a77c1c8aa0fa15884719babc3da6b55e9ac90505 SHA-256: 8209282fc3f33184f55402c478fd1c68e37f82e39a237415a735df6bf66f2d0e
126 Risk Score

Malware Insights

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

The sample is a PDF file flagged by multiple heuristics as malicious, including a ML classifier and ClamAV detection for phishing and trojan activity. It contains numerous embedded URLs pointing to disposable domains, with one heuristic specifically identifying it as a link farm. The presence of embedded URLs and the nature of the heuristics suggest an attempt to redirect users to malicious content, likely for phishing or scam purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://seumenha.ru/aws?utm_term=deserialize+json+c%2523+example
    • http://kibatol.22web.org/affinity_chromatography_notes.pdf
    • http://damomemisogadex.iblogger.org/jixulufagilufufe.pdf
    • http://zakewabo.scienceontheweb.net/zakidomuzudabimarexazewe.pdf
    • http://zeridojatis.iblogger.org/principle_centered_leadership_book.pdf
    • http://wofaguwere.iblogger.org/callese_y_venda_gratis.pdf
    • http://gitamoravazini.22web.org/domaruxug.pdf
    • http://juborad.mywebcommunity.org/24804541527.pdf
    • http://tapozifokun.mywebcommunity.org/wetuxotonoru.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://suwuriru.onlinewebshop.net/difference_between_am_and_fm_modulation.pdf
    • http://ritumogadoj.onlinewebshop.net/los_juegos_del_hambre_1_pelicula_netflix.pdf
    • http://riberudedanute.epizy.com/lagodobawubekenofibomuzo.pdf
    • http://xotaferuju.myartsonline.com/les_alphas_lecture.pdf
    • http://rixuroruwe.myartsonline.com/acer_laptop_offers.pdf
    • http://kimejuj.rf.gd/avatar_2_full_movie_english.pdf
    • http://zevatilak.epizy.com/57914088696.pdf
    • http://xenavak.rf.gd/adding_positive_and_negative_integers_worksheet.pdf
    • http://wetegazepi.epizy.com/53615561881.pdf
    • http://xasagamuforokek.rf.gd/formula_para_calcular_el_porcentaje_de_masa_muscular.pdf
    • http://xabudavadeguvo.myartsonline.com/bowflex_blaze_exercises.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c5f5.bin
5f223a98e48e17c4891a017694eb79c8d4f91bb5ee0c1226752ca48c358b328e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC5F5 4916 bytes
font_01_sfnt_off0000d6cb.bin
d3ba6a8be27519860756b8abf000ced68759e0b55ed45dacf0661dd7a81346f0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD6CB 10800 bytes

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