Malicious PDF — malware analysis report

Static analysis result for SHA-256 c406b3b6b53447d6…

MALICIOUS

PDF

79.2 KB Created: 2021-04-09 12:13:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: c79b4889759120e239e58fa28f353daf SHA-1: 95db3f3997795b412140b3995e9a12445d9dd848 SHA-256: c406b3b6b53447d60f1d72142ba8930365fbc9f206c38762c3336505e6f765cb
126 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

This PDF document was flagged by multiple heuristics, including a machine learning classifier and ClamAV, as malicious. It contains numerous external URIs, with a notable heuristic identifying it as a link farm on disposable hosting, pointing to suspicious domains like 'opticsystem.website'. The document body, though heavily obfuscated, appears to be a lure related to cleaning instructions, aiming to redirect users to potentially harmful sites.

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 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://golowaki.ru/strik?utm_term=how+to+clean+lg+top+load+washer+filter PDF link annotation
    • http://opticsystem.website/69039224558x6pp7.pdfIn PDF document text
    • http://sevastopol.sale/pawazuslzh4t.pdfIn PDF document text
    • http://beamorem.com/schlage_connect_electronic_deadbolt_camelot_satin_nickel_-_be365_cam_619uxe2t.pdfIn PDF document text
    • http://cancandance.org/harry_potter_book_covers_thailand62vpw.pdfIn PDF document text
    • http://esportzmlevent.com/wurotuvisijuxededutagomjuis.pdfIn PDF document text
    • http://lnstagramservicecopyrights.com/battlefield_2142_revive0948m.pdfIn PDF document text
    • https://cdn.sqhk.co/betewulo/6WRHDtJ/mezuxosifosuseb.pdfIn PDF document text
    • https://cdn.sqhk.co/gasariba/Khbwiaz/dibasadogutirakofax.pdfIn PDF document text
    • http://znakomstva69.space/best_jump_starter_with_compressor_ukyylq7.pdfIn PDF document text
    • http://edayafar.xyz/143061650366v6vw.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://5c2df1de-05ea-4e17-9aa3-38adc7ce3153.filesusr.com/ugd/ddd609_41f0d221dbaf46ebaa310b5485aa0b55.pdf?index=trueIn PDF document text
    • https://77483064-5892-4b52-b419-66e751946b77.filesusr.com/ugd/ef7b09_a77055696a9e47dca3662bbf3e856810.pdf?index=trueIn PDF document text
    • https://05282879-aed3-4f16-ac14-d534add4d4bd.filesusr.com/ugd/0f8b7c_4dad5b45ce13497b92e98b268f57ec45.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/f86b0216-48fe-49fa-b2af-03276e10175a/libesudulakasujatexunowu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/08bef5df-a9d7-45df-b67a-8819036cd1ba/xidulerefivazuvi.pdfIn PDF document text
    • https://436c154b-1c2d-4c60-9768-ed3a268ef5e1.filesusr.com/ugd/e8e253_0379468153994e44812927bc2d75c9d3.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/770a4db6-3548-4a9a-8140-7821e83e8b82/tadusinenev.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

Related samples 4

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f456.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF456 5468 bytes
SHA-256: 257bcf1d337b4f2ab116c820756c52d80a8e9e5de4435a151ec015b1e126499b
font_01_sfnt_off000106fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106FD 12488 bytes
SHA-256: 3b0723fc6fbf08bd1ace4a660302191480852e19098a33414e645af51f5256b0

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