Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9473ac0005e7e76…

MALICIOUS

PDF

82.3 KB Created: 2021-03-16 19:09:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5d091ac647f6db54e863384c2e9af3f2 SHA-1: de6ef450718203c91b25e9c17b0501043d997f6e SHA-256: f9473ac0005e7e7610ef47492f50e9ab134af175d1b304712424caf536f8480b
126 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to disposable hosting, and is flagged by ML classifiers and ClamAV as malicious phishing content. The document body, though heavily obfuscated, contains text related to streaming apps, likely a lure to direct users to the malicious URL. No scripts were extracted, but the PDF structure itself facilitates the redirection.

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://leonvi.ru/123?utm_term=best+streaming+apps+for+android+box
    • https://cdn-cms.f-static.net/uploads/4454056/normal_604a0f817e488.pdf
    • https://cdn-cms.f-static.net/uploads/4375515/normal_601a47a387add.pdf
    • http://wexebigusokata.iblogger.org/56122249799.pdf
    • http://tefukuk.iblogger.org/diduxakojaxemopegasud.pdf
    • https://cdn-cms.f-static.net/uploads/4415327/normal_603296450aa35.pdf
    • https://static.s123-cdn-static.com/uploads/4489843/normal_600219b4f15de.pdf
    • https://static.s123-cdn-static.com/uploads/4486045/normal_6001c63f8e992.pdf
    • https://static.s123-cdn-static.com/uploads/4421957/normal_5ff9ff46760f4.pdf
    • http://xoroketogejuxe.mywebcommunity.org/sifotapidolekadezew.pdf
    • https://static.s123-cdn-static.com/uploads/4453144/normal_600976969d14a.pdf
    • https://static.s123-cdn-static.com/uploads/4457839/normal_60036263a8c89.pdf
    • https://static.s123-cdn-static.com/uploads/4488604/normal_5ff80545abccf.pdf
    • http://jamosaxomexe.iblogger.org/sisojakalejagivaluxuvefap.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://dajejumu.rf.gd/carlow_county_council_planning_application_form.pdf
    • https://s3.amazonaws.com/gedesisumi/ibps_notification_clerk_2019.pdf
    • https://s3.amazonaws.com/subopukomanaw/bewepijagugowe.pdf
    • http://jetotajasavesi.atwebpages.com/buvenigewedafuxure.pdf
    • http://lidazadopedu.rf.gd/64657538725.pdf
    • https://s3.amazonaws.com/jagux/alliestein_v0._5.pdf
    • http://xubivinonoloru.rf.gd/fleck_5600sxt_48_000_grain_water_softener_reviews.pdf
    • http://xesiduzivodugi.epizy.com/molizorerex.pdf
    • https://s3.amazonaws.com/davubewu/probability_dice_calculator_answers.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010182.bin
2565c848630b6ef5088d47fc50df3fa3ca24baf99a5076dfd2b6b52859562fcc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10182 5588 bytes
font_01_sfnt_off00011470.bin
22be20d9dd9545434cabd206486b7b27f6dd868c0c694c511131a80c56320991		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11470 11040 bytes

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