Malicious PDF — malware analysis report

Static analysis result for SHA-256 154292b44137ced6…

MALICIOUS

PDF

88.3 KB Created: 2021-02-13 16:21:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: b7ccab5ed134fac2cb7fdff48b0a1eb8 SHA-1: 6865f5beb75355b86f0858cd582dc426e965d5c6 SHA-256: 154292b44137ced65493dea94aa0e00aa54dffa924b1b97f96c6aa5750a168a8
126 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, with heuristics indicating it functions as a link farm on disposable hosting. It contains numerous embedded URLs pointing to potentially malicious or phishing sites. The presence of PDF-specific heuristics and the nature of the URLs suggest an attempt to direct users to external content, likely for malicious purposes such as credential harvesting or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://maypoin.ru/wb?keyword=application%20of%20actinomycetes%20pdf PDF link annotation
    • https://cdn.sqhk.co/susojareb/gihhcih/8_ball_pool_hack_iphone_2019.pdfIn PDF document text
    • https://cdn.sqhk.co/kelufuro/T7BHjd8/44515144423.pdfIn PDF document text
    • http://mainsale.info/33404798967g9dbx.pdfIn PDF document text
    • https://cdn.sqhk.co/gefimiwotux/jbuA9id/xovufogab.pdfIn PDF document text
    • http://vosalax.22web.org/schulferien_baden_wrttemberg_2019.pdfIn PDF document text
    • https://cdn.sqhk.co/gavezexu/QlMibRR/figakedimunolo.pdfIn PDF document text
    • https://cdn.sqhk.co/wixexozesila/iidcIjj/setmore_appointments_appointment_scheduling_app.pdfIn PDF document text
    • http://wiinorama.space/jovenudimurifuxegoginoxozay9h1.pdfIn PDF document text
    • http://lavkavkusa.store/cowpens_weather_reportidng9.pdfIn PDF document text
    • http://labiosdewonda.com/79727829745rfyuf.pdfIn PDF document text
    • http://copyrightmediahelp.com/aasld_practice_guidelines_hepatic_encephalopathys8boe.pdfIn PDF document text
    • https://cdn.sqhk.co/xusopusavo/f1Nliwu/92394785838.pdfIn PDF document text
    • https://cdn.sqhk.co/gabixeme/hfjaahf/16191691659.pdfIn PDF document text
    • http://summer-italy.fun/samsung_email_app_not_working_with_gmail3axxf.pdfIn PDF document text
    • http://abwaab.su/inyeccion_monopunto_y_multipunto_diferenciasy0wah.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gigitepusiligo.epizy.com/90180412347.pdfIn PDF document text
    • https://s3.amazonaws.com/dezajok/bridging_the_gap_powerpoint_template.pdfIn PDF document text
    • https://s3.amazonaws.com/paxivogedewilu/4883799493.pdfIn PDF document text
    • http://xozelabudizi.epizy.com/bundeswehr_fallschirmjger_uniform.pdfIn PDF document text
    • https://s3.amazonaws.com/widetunipet/birthday_invitation_card_vector_free.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000103bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103BC 5296 bytes
SHA-256: 131cc6e3dc883e68ba24bc8c626457fd54c68eaf8fdb7b57ff4b8f57112f156e
font_01_sfnt_off000115c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115C3 12416 bytes
SHA-256: 6293ca1ce3c48112cfbeb67edfbf4789765f71a15d29bb721cc942b650db3ac5
font_02_sfnt_off00013eea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13EEA 16060 bytes
SHA-256: 4ef9506ee11a349461550e6b437e3786686b598308a87786035880d16624999d

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