Malicious PDF — malware analysis report

Static analysis result for SHA-256 87434a1149bc0654…

MALICIOUS

PDF

74.7 KB Created: 2021-04-29 09:40:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: 493082fce418abba0352d4b1348d525a SHA-1: 2e84025290f73696af7185e2d551e672ad04bc9f SHA-256: 87434a1149bc0654ec4a6f0dd1202714c510be4cd7d4c8383b7039a8a00df1f9
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by multiple heuristics as malicious, including a high ML score and ClamAV detection as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable hosting or link farms, designed to redirect users to potentially malicious sites. The document body, though heavily obfuscated, contains metadata related to its creation, but no direct user-facing lure text is discernible.

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://lozipotod.ru/strik?utm_term=what+time+of+year+are+onions+harvested PDF link annotation
    • https://gudaxukusakirip.weebly.com/uploads/1/3/4/0/134096244/400230.pdfIn PDF document text
    • http://pekibexuvipeve.scienceontheweb.net/who_is_the_assumed_speaker_in_annabel_lee.pdfIn PDF document text
    • https://kafekejanabex.weebly.com/uploads/1/3/2/7/132740445/zenajafosun.pdfIn PDF document text
    • http://sejujanovemo.medianewsonline.com/salesforce_interview_questions_and_answers_for_experienced.pdfIn PDF document text
    • http://zorimiba.iblogger.org/soundarya_lahari_slokas_in_tamil.pdfIn PDF document text
    • https://femixazate.weebly.com/uploads/1/3/4/3/134363246/bff2cb0.pdfIn PDF document text
    • https://cdn.sqhk.co/gidagolusi/TzRjejg/83857659925.pdfIn PDF document text
    • https://wiraxupafetob.weebly.com/uploads/1/3/2/6/132696263/7511278.pdfIn PDF document text
    • https://cdn.sqhk.co/zibumimuw/ejeggjc/72610432229.pdfIn PDF document text
    • https://cdn.sqhk.co/feguzuvubut/hcsjhBZ/to_the_moon_netflix_review.pdfIn PDF document text
    • https://cdn.sqhk.co/mudebijutene/hehdGhd/43879101643.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://ferenekukosazu.epizy.com/fisher_grandpa_bear_wood_stove_manual.pdfIn PDF document text
    • http://novepajosebuji.rf.gd/rubojeropurusonefaxup.pdfIn PDF document text
    • http://finuximiwogum.rf.gd/hungry_shark_night_apk_free.pdfIn PDF document text
    • http://sasukagisodubex.onlinewebshop.net/72957576117.pdfIn PDF document text
    • http://bonitadobizaw.epizy.com/adobe_photoshop_software_online.pdfIn PDF document text
    • http://japinoxizidunub.myartsonline.com/vabanajesepaz.pdfIn PDF document text
    • http://tukakuze.epizy.com/21187736731.pdfIn PDF document text
    • http://kudogal.rf.gd/beechcraft_sundowner_180_performance.pdfIn PDF document text
    • http://maretubozewugi.myartsonline.com/dewetupa.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_off0000e780.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE780 5288 bytes
SHA-256: 0fbd9e25e546b08da5f4119e2710170d47c987aa9c5c0dbfb9473c10f29224e0
font_01_sfnt_off0000f968.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF968 10696 bytes
SHA-256: 44b7d8aa061febb9d86339f21d102143e29728a50e6545087903e29093bcc8b3

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