Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5eba7cef310beb1…

MALICIOUS

PDF

87.4 KB Created: 2021-04-10 16:45:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: d877610b9731daf872a1356a3048fb7c SHA-1: e266907aab5236edd64c198b9420dc36ca77a89c SHA-256: b5eba7cef310beb1a7abba207414f3a4ee62f83fcec896edd997be75a7e9ec1b
126 Risk Score

Malware Insights

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

The ML classifier and ClamAV detection strongly indicate maliciousness. The PDF contains numerous embedded URLs, with one specifically pointing to 'lozipotod.ru/strik', suggesting a phishing or malware distribution attempt. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this by identifying the PDF as a link farm on disposable hosting, likely to obscure the true malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://lozipotod.ru/strik?utm_term=the+wave+movie+summary PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4416929/normal_5ffc9b7723667.pdfIn PDF document text
    • http://poguferuliwu.iblogger.org/xixubizawumivilesovub.pdfIn PDF document text
    • http://wozilimesiz.mypressonline.com/33073564525.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4405903/normal_6003792296d21.pdfIn PDF document text
    • http://spindlndou.space/resto_noirmoutier_la_marineor98b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452845/normal_5fd358ee14842.pdfIn PDF document text
    • http://steblin.pro/why_isnt_my_netgear_wifi_extender_workingo4ulk.pdfIn PDF document text
    • http://vomidujoma.scienceontheweb.net/menipovoralifa.pdfIn PDF document text
    • http://xajifefule.iblogger.org/20032141616.pdfIn PDF document text
    • http://top-agent.ru/nivazirisojuwawegojususucnnjv.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452865/normal_604d260873359.pdfIn PDF document text
    • http://shop-onlain.fun/9866873014ith0o.pdfIn PDF document text
    • http://immorta-cross1.club/saragosoxexozafojozufajalvzhrg.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bototiluwoge.atwebpages.com/hematology_clinical_cases_uncovered.pdfIn PDF document text
    • http://kozuwuwupoxofi.rf.gd/plugins_not_showing_up_in_wordpress_dashboard.pdfIn PDF document text
    • http://nopizapokife.epizy.com/28758597282.pdfIn PDF document text
    • http://tujevudaxuxos.epizy.com/preqin_alternative_assets.pdfIn PDF document text
    • http://bozalusi.epizy.com/gifiluxusigunupi.pdfIn PDF document text
    • http://punedika.epizy.com/organizational_behavior_18th_edition_pearson.pdfIn PDF document text
    • http://guberiwexoza.rf.gd/84587887827.pdfIn PDF document text
    • http://dakerubigama.epizy.com/xidojuvitugeboto.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001063e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1063E 5096 bytes
SHA-256: c9510e210339903c930845ba5df2293f4ec375b7596ad1cf741680c925c9983c
font_01_sfnt_off00011780.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11780 10308 bytes
SHA-256: 86acb50233625d35031f72f3ee8d0aabba082a356b898b7a2eeaa719c1c3608b
font_02_sfnt_off00013af0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13AF0 16204 bytes
SHA-256: a95eff378c135b1ab40d10b3cd1da1bafbc07f86005f57898d079c90d712ddbd

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