Malicious PDF — malware analysis report

Static analysis result for SHA-256 e870f485335eb969…

MALICIOUS

PDF

72.0 KB Created: 2021-05-06 17:02:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 4fc310534c60006488aefc20cc2b1023 SHA-1: 18f30526d9423cd0dcd45636f113145ab97b7fb8 SHA-256: e870f485335eb969f5efa0c895086853a7e19e9393e95afa056feb2f98059c77
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. It contains a large number of external links, many pointing to domains like 'xezojetit.ru' and 'cdn.sqhk.co', suggesting a link farm or redirection mechanism. The embedded document body, though heavily obfuscated, contains text related to lyrics and application names, which could be part of a social engineering lure.

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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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=lyrics+fear+i+don%2527t+care+about+you PDF link annotation
    • https://cdn.sqhk.co/xejarirep/ajd1TLS/pink_glitter_ombre_coffin_nails.pdfIn PDF document text
    • https://cdn.sqhk.co/rasidepad/I9UeLib/16297578626.pdfIn PDF document text
    • https://cdn.sqhk.co/muzorefu/Zahdiaj/lawujomesuzitajasese.pdfIn PDF document text
    • http://prizinsta.site/how_to_take_call_forwarding_off_nec_phone280cd.pdfIn PDF document text
    • https://cdn.sqhk.co/kikutajaz/5sbgdqK/908335589.pdfIn PDF document text
    • https://cdn.sqhk.co/dimusokobab/HgejChb/adventureland_water_park_cabana_rental.pdfIn PDF document text
    • https://cdn.sqhk.co/fubafonu/jcD7hic/weather_tomorrow_atlanta_ga.pdfIn PDF document text
    • https://cdn.sqhk.co/peporewav/mwjd5ie/history_of_phe_in_dark_ages.pdfIn PDF document text
    • https://cdn.sqhk.co/xunijejozi/ihP2jbR/51004546575.pdfIn PDF document text
    • http://medicinfo.online/birmingham_city_council_housing_application_form5t82r.pdfIn PDF document text
    • https://cdn.sqhk.co/wobuwozavenu/sicyjeV/programa_playmemories_home_sony_windows.pdfIn PDF document text
    • https://cdn.sqhk.co/tuwebobit/ghXGX2D/soxupifatifasukigelolur.pdfIn PDF document text
    • https://lozusometuzasop.weebly.com/uploads/1/3/4/7/134741376/489369.pdfIn PDF document text
    • https://cdn.sqhk.co/ranetixeba/pzQSNhd/47579425613.pdfIn PDF document text
    • https://cdn.sqhk.co/vufebevefo/iakubib/square_painting_on_wall.pdfIn PDF document text
    • https://fogebutozedelig.weebly.com/uploads/1/3/0/7/130776223/1902904.pdfIn PDF document text
    • https://cdn.sqhk.co/lukuvekeliki/zHhgDoP/casper_linen_sheets_review.pdfIn PDF document text
    • https://lekusimije.weebly.com/uploads/1/3/1/3/131383821/vebevosorap.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000dd26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD26 5200 bytes
SHA-256: 18811230bb3d4fea166253ba30d2654008f4d06198c499e1562d2e32f256ab45
font_01_sfnt_off0000eef6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEF6 10476 bytes
SHA-256: f6f86c09ccd619d733d316c41ac78b0985cffd190b843b6c94635c7e1bfe594b

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