Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c239cbc2c7fcb00…

MALICIOUS

PDF

79.1 KB Created: 2021-05-03 16:11:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: d9c2309108092c5c4396db02cf4d1cd3 SHA-1: b2d0d0a9b7373fbfafaf2f0b788363efe42b4103 SHA-256: 6c239cbc2c7fcb0071013cc0f87022f14a5fca92e7bb98278728912bf3310b0b
126 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://mezovuduw.ru/strik?utm_term=what+literary+devices+are+used+in+the+poem+mother+to+son PDF link annotation
    • http://flipping-car.online/casio_g_shock_battery_replacement_philippinesk8fjc.pdfIn PDF document text
    • http://vinnipoh.fun/honda_eu3000i_generator_spark_plugsjq2l.pdfIn PDF document text
    • http://fragcups.com/pottery_3d_mod_apkjqyrx.pdfIn PDF document text
    • https://wujenorap.weebly.com/uploads/1/3/5/3/135322769/narugajaduson.pdfIn PDF document text
    • https://gerogebu.weebly.com/uploads/1/3/1/6/131637886/wigejoxuzes-zixad.pdfIn PDF document text
    • http://povar2020.site/star_trek_fleet_command_missions_with_jellyfish_parts85fox.pdfIn PDF document text
    • http://carinsusa.info/spectrum_math_workbook_grade_8_free92cvz.pdfIn PDF document text
    • https://lixubirenolona.weebly.com/uploads/1/3/4/6/134669397/luvapuwofewupamak.pdfIn PDF document text
    • http://mobile-media.moscow/xazimidosobolomiziseyqpc8.pdfIn PDF document text
    • http://1xbet-registrat.site/52829575933eir0f.pdfIn PDF document text
    • https://napolapivu.weebly.com/uploads/1/3/5/3/135303388/6444376.pdfIn PDF document text
    • http://newser.site/3d_text_font_free90ysw.pdfIn PDF document text
    • http://rm-swis-mine.com/lenovo_t420_laptop_release_datennic3.pdfIn PDF document text
    • http://podipotekoi.ru/244747486071erke.pdfIn PDF document text
    • https://cdn.sqhk.co/seseniluvus/jqz7clh/zinatazom.pdfIn PDF document text
    • http://buybritishcat.com/how_to_use_parallette_barse8j01.pdfIn PDF document text
    • https://cdn.sqhk.co/tunuzasana/BgcgiOF/sikugexuxifi.pdfIn PDF document text
    • https://cdn.sqhk.co/dosakupu/fU7gjPR/alopecia_androgentica_2018.pdfIn PDF document text
    • http://bcpzonasegur4viabcp.com/gilelufarenejokitorureen08v.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/xazarujokemus/vovajija.pdfIn PDF document text
    • https://s3.amazonaws.com/dejazuvorira/69966825530.pdfIn PDF document text
    • https://s3.amazonaws.com/mafavuzenoliki/how_do_you_steam_vegetables_in_a_black_and_decker_rice_cooker.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_off0000f840.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF840 5488 bytes
SHA-256: 60d110eb63bbb2c285b960f13aa332e41d829959471290f55e7d02b305438c54
font_01_sfnt_off00010ad8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AD8 10508 bytes
SHA-256: 56bfffa33562c413d284c3dd5b9be386eac38e33372600d1240b2f866e274e1c

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