Malicious PDF — malware analysis report

Static analysis result for SHA-256 7375c9a099d90bf5…

MALICIOUS

PDF

77.0 KB Created: 2021-03-25 05:44:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c4293ff5c4a74545d08fbe170a9905cb SHA-1: a9088af32d25e17c0426d3fa4461624fd660d3ce SHA-256: 7375c9a099d90bf50802788fd0c3f86bf19a3ad487e408932584c0cd3bf6db93
156 Risk Score

Malware Insights

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

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of external links, many of which are likely part of a link farm or redirection scheme. While no scripts were explicitly extracted, the presence of numerous external URLs and the 'PDF_SEO_LINK_FARM' heuristic suggest an attempt to distribute malicious content or phish users. The document body is heavily obfuscated and appears to be a corrupted version of a book title, likely a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://mezovuduw.ru/wix?keyword=managing+business+ethics+straight+talk+about+how+to+do+it+right+6th+edition+pdf
    • https://cdn.sqhk.co/gowamojon/ihig4ji/guitar_hero_rock_the_80s.pdf
    • https://cdn.sqhk.co/pibexezases/Pjghgif/new_uc_turbo_browser_fast_download.pdf
    • https://cdn.sqhk.co/jarixizotib/Vpiex4S/23474055603.pdf
    • https://cdn.sqhk.co/sozaxejiv/MKGEicP/kontraband_store_kylie.pdf
    • http://saburogamo.iblogger.org/wolavujavosipazij.pdf
    • https://vugovarekuluf.weebly.com/uploads/1/3/1/6/131607096/b8f38.pdf
    • https://cdn.sqhk.co/jememobak/jgmx7aD/somufefo.pdf
    • http://mizizufiku.mywebcommunity.org/hp_7525_printer_driver.pdf
    • https://kixivoveluvib.weebly.com/uploads/1/3/0/7/130775150/dejegorizusuboxi.pdf
    • https://labatozun.weebly.com/uploads/1/3/1/6/131607827/tuxegosufifin_xoturubiwirom_wakijodenabon_relibogize.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://kovudefimure.rf.gd/letoviriki.pdf
    • http://movoxafaxusuguf.epizy.com/papedizafixerokireladoz.pdf
    • https://uploads.strikinglycdn.com/files/3b7e6e63-f5ef-461c-b5f4-8d5485694a95/jorivufubidezemusebek.pdf
    • http://dikavara.epizy.com/html_to_python_2._7.pdf
    • http://deroxemonak.epizy.com/dopuxixumuwo.pdf
    • http://sidoxabikuw.rf.gd/72967080719.pdf
    • https://uploads.strikinglycdn.com/files/16782d69-2465-48b0-a127-c03efe587fb1/moboditirov.pdf
    • http://vapewokadovusa.myartsonline.com/margaret_atwood_the_testaments.pdf
    • http://dejogamolefip.rf.gd/dojiradugedizide.pdf
    • http://derajovaku.rf.gd/66029028031.pdf
    • http://vezoxonu.epizy.com/1909297716.pdf
    • http://tasibufoz.rf.gd/background_blur_images.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_off0000ee20.bin
621a585f1a84fe3c8dfd76f624e94137202033fa94b3295ee7c6b73c49c49863		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEE20 5872 bytes
font_01_sfnt_off00010231.bin
1a05f2a4d7a07786d2de43e651ac6ac313611553be9866ba11fd8b2bc2171f6b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10231 10856 bytes

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