Malicious PDF — malware analysis report

Static analysis result for SHA-256 5879c90cfa622a19…

MALICIOUS

PDF

68.2 KB Created: 2021-03-10 02:26:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: bd5a1b44498f4e9476797a9ac4d960ce SHA-1: 713665bc44fa788881c4821aee97952b5817d18b SHA-256: 5879c90cfa622a196d1b28e2ef9e74f8019e155fa3ae7a57f0dfe06f43f6053d
186 Risk Score

Malware Insights

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

The sample is a PDF file identified as malicious by ML classifiers and ClamAV. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or SEO manipulation tactic. The presence of numerous external links, including one to 'nipisod.ru', indicates potential distribution of further malicious content or phishing lures.

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
  • 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.
  • 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://nipisod.ru/award?keyword=ashrae+handbook+1993+fundamentals+pdf PDF link annotation
    • https://cdn.sqhk.co/futevanu/jjdjcM8/95719439.pdfIn PDF document text
    • https://cdn.sqhk.co/xusozapovu/K2iejaP/gacha_life_edits_boy_and_girl.pdfIn PDF document text
    • https://cdn.sqhk.co/napumefu/dzAUihH/mcpe_pixelmon_mod_download_android.pdfIn PDF document text
    • https://wegonugu.weebly.com/uploads/1/3/4/0/134040733/kaxuxedixin-tajuzejoz.pdfIn PDF document text
    • https://cdn.sqhk.co/xonafelog/iicat0s/larva_freecell_card_game_download.pdfIn PDF document text
    • https://latapelubatute.weebly.com/uploads/1/3/5/9/135960370/9342672.pdfIn PDF document text
    • https://cdn.sqhk.co/bevoroxur/gf8jexj/open_houses_today_in_mesa_az.pdfIn PDF document text
    • https://cdn.sqhk.co/mikevoponage/Mhdajic/eric_lipton_new_york_times.pdfIn PDF document text
    • https://cdn.sqhk.co/kepebeso/X8yifnw/12674053424.pdfIn PDF document text
    • https://guzesunidami.weebly.com/uploads/1/3/0/8/130873942/dulow.pdfIn PDF document text
    • https://cdn.sqhk.co/sexipemajim/9UhduFN/pocket_minecraft_server_download.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/vexeliku/answers_to_common_interview_questions_uk.pdfIn PDF document text
    • http://zupitatip.atwebpages.com/what_are_the_components_of_mission_statement.pdfIn PDF document text
    • https://ce3a146a-d504-4efb-981c-4593fb85d965.filesusr.com/ugd/5b5da7_fb551c7e70ee415c9f568fc07dee9f6b.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/taguxif/tuginazagawadu.pdfIn PDF document text
    • https://034618a9-9b39-4f41-ad18-95bca1d1c80b.filesusr.com/ugd/48d9a1_6c0dbc99231e4888b80524b19e850ba9.pdf?index=trueIn PDF document text
    • https://95e354e6-8561-4e52-807b-deb85f3b5fdd.filesusr.com/ugd/ca9b0a_27d982eda6a04ff492e18c5bab0e91a5.pdf?index=trueIn PDF document text
    • http://samajusinifako.atwebpages.com/farajozetujodu.pdfIn PDF document text
    • https://1b65b899-5fad-42bd-af9e-a3fb1d6a4c80.filesusr.com/ugd/a2ebd8_0b96450e63d547de9162f85843d62858.pdf?index=trueIn 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_off0000cd3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD3E 5848 bytes
SHA-256: 22ce7dde013f09e7d92a3d939cd86720b1d43e29475970f2bd00b53bb1991cab
font_01_sfnt_off0000e0f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0F3 10136 bytes
SHA-256: a1a1b6efda7105971e60a6c5097394e87c4ffd186b72a38d8560a837c3c881da

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