Malicious PDF — malware analysis report

Static analysis result for SHA-256 291538753f74cdc3…

MALICIOUS

PDF

83.1 KB Created: 2021-04-21 17:00:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 32201c9adffdf69d9aaee5a3adaa963d SHA-1: dfa7105dc435554a632ae64870f7224c1bfa8663 SHA-256: 291538753f74cdc3c60c72c96d430db1bf9be89d3bc85657a1b8619136c83db3
176 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The sample is identified as malicious by ClamAV and an ML classifier, and it contains a high-severity heuristic indicating it's an SEO redirector for phishing. The document body, though heavily obfuscated, suggests a lure related to 'Linux system programming tutorial pdf'. The presence of external URIs and a clipboard command lure indicates an attempt to trick the user into executing malicious content or visiting a compromised site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • Clipboard command execution lure high SE_CLIPBOARD_COMMAND_LURE
    Document tells the user to copy or paste clipboard content into Run, PowerShell, cmd, or another shell-like execution context
  • 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://xezojetit.ru/strik?utm_term=linux+system+programming+tutorial+pdf PDF link annotation
    • http://magnitoli-2ekran.site/excel_vba_table_functions14n0m.pdfIn PDF document text
    • http://afracheat6.xyz/kenuniwodufedorofimogijij7o2qj.pdfIn PDF document text
    • https://cdn.sqhk.co/biluvetizom/iilihgh/santorini_travel_guide_map.pdfIn PDF document text
    • https://cdn.sqhk.co/podogule/fkgd55y/business_management_and_administration_career_cluster_description.pdfIn PDF document text
    • https://cdn.sqhk.co/lamijaluxeso/jdwzidv/nuzimawozem.pdfIn PDF document text
    • https://cdn.sqhk.co/riteximeras/joGhgjb/75330629633.pdfIn PDF document text
    • https://cdn.sqhk.co/gabazumad/QNictja/flip_runner_mod_apk_1._1._12.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/637370eb-67e8-4d39-bf9e-544a2b3caefe/is_there_a_kelley_blue_book_for_canada.pdfIn PDF document text
    • https://s3.amazonaws.com/jusagi/12059043104.pdfIn PDF document text
    • https://s3.amazonaws.com/muvemasoxaji/xefupavedusinulujuzimabi.pdfIn PDF document text
    • https://s3.amazonaws.com/mesixadelomomo/dazezuvit.pdfIn PDF document text
    • https://s3.amazonaws.com/jebokizez/why_dryer_not_heating.pdfIn PDF document text
    • https://s3.amazonaws.com/nuvukivaxiren/airedale_academy_6th_form.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b1c37173-4d31-42b4-9728-30e74b9b41d3/rinnai_heaters_direct_vent.pdfIn PDF document text
    • https://s3.amazonaws.com/negonanopix/guia_autometrica_abril_2018.pdfIn PDF document text
    • https://s3.amazonaws.com/gudukupir/bomber_game_apk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ee6de00e-04d1-4c0c-98f3-96348ccac329/ginomofafefivigur.pdfIn PDF document text
    • https://s3.amazonaws.com/vovopafubipu/fezuguxolibivij.pdfIn PDF document text
    • https://s3.amazonaws.com/semuxemakaw/zeteguleko.pdfIn PDF document text
    • https://s3.amazonaws.com/sivanira/tv_guide_gippsland_victoria.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_off00010638.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10638 5472 bytes
SHA-256: 1b73d3dcb1d50acb123ea0f7f5d39194507e3bc20e4a0568240155505403b53d
font_01_sfnt_off000118d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118D0 11420 bytes
SHA-256: ed6dede71c65f74c6984c577d871492ca8a057b34dbc4cb272ba2a38df0e5c90

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