Malicious PDF — malware analysis report

Static analysis result for SHA-256 099b813eb8082902…

MALICIOUS

PDF

144.1 KB Created: 2021-05-10 00:44:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: c20ec47276ff668ad6136bb3ee53035d SHA-1: 7b95a5c9c71d7bd4c92cf1bc5a1478c51e22ddc6 SHA-256: 099b813eb8082902aea461fa8061490015b255bf72f97f2b8d0551aa6bd50cf8
126 Risk Score

Malware Insights

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

The sample is a PDF file flagged by ClamAV as a phishing trojan. It contains an embedded URL pointing to 'baarspo.ru', which is likely used to redirect the user to a malicious site. The PDF's content, though heavily obfuscated, appears to be a lure related to travel books, suggesting a phishing or credential harvesting attempt.

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://baarspo.ru/strik?utm_term=travel+books+like+lonely+planet PDF link annotation
    • https://cdn.sqhk.co/gojinuma/hiLixJD/rema_tip_top_price_list.pdfIn PDF document text
    • https://cdn.sqhk.co/tisumusef/Dgevhc6/65154022629.pdfIn PDF document text
    • http://fejugutafilevin.scienceontheweb.net/57609206233.pdfIn PDF document text
    • http://tozebejiposutor.iblogger.org/galisunasifowoperuzok.pdfIn PDF document text
    • http://zamowafa.mywebcommunity.org/fopasetod.pdfIn PDF document text
    • http://lewijufe.sportsontheweb.net/vehicle_sale_agreement_format_in_malayalam.pdfIn PDF document text
    • http://kiluzilaw.sportsontheweb.net/36116890319.pdfIn PDF document text
    • http://durugara.iblogger.org/mumudonebanobuvixumiw.pdfIn PDF document text
    • http://nizavevorupuj.mywebcommunity.org/tanajivepir.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://9e6c4f0b-3406-4274-bf8a-5be7f948d240.filesusr.com/ugd/45c6ff_8a36dca7c1fe4200ab0f75e3391b7195.pdf?index=trueIn PDF document text
    • http://kebuzomu.rf.gd/2283118143.pdfIn PDF document text
    • http://vikogen.epizy.com/accounts_ratio_formula.pdfIn PDF document text
    • https://22520ec4-2132-45a5-98b8-54db1b71d3ea.filesusr.com/ugd/b33b96_ec281e4f721a402a979a9fa0afadd176.pdf?index=trueIn PDF document text
    • https://4db61c00-1078-4917-8a1c-a2c1480eb6e0.filesusr.com/ugd/c94206_f2a4d7a383c34a6a80e6389411e76395.pdf?index=trueIn PDF document text
    • http://bopenakonaj.rf.gd/gutuwunofenobuda.pdfIn PDF document text
    • http://zakuvusebaj.epizy.com/16211647483.pdfIn PDF document text
    • http://zezofakarol.myartsonline.com/the_dragonbone_chair_synopsis.pdfIn PDF document text
    • https://1ae094b9-110d-4377-a83c-911b29edd90d.filesusr.com/ugd/d5eada_497126961523472e8fdd5ed670a1c664.pdf?index=trueIn PDF document text
    • http://jutagejefutix.atwebpages.com/cambridge_key_for_schools.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off0000f865.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xF865 85524 bytes
SHA-256: 8ae0980c0669782a4d210c0ffa189a210d89db62c3ad40b19d57312809d578c1
font_01_sfnt_off0001f908.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F908 5128 bytes
SHA-256: 43d4df790d52a45bd0841baff9d9970b9337f457b4ae8366bd9885b3c6f23668
font_02_sfnt_off00020a90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x20A90 11224 bytes
SHA-256: afd07cf43c3dbfb170a415e0a409605b518a8c1937dc5e7ee99ca7f8af0ae1ca

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