Malicious PDF — malware analysis report

Static analysis result for SHA-256 e20a3bc4fc2bbe28…

MALICIOUS

PDF

72.2 KB Created: 2021-09-19 18:57:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-27
MD5: d2481650cb51907d8c2e90ea814ef5e3 SHA-1: e17b3939b2afd44cc1fc4b59415132d479da8dc7 SHA-256: e20a3bc4fc2bbe28c7849cba5c7ae09e8340164fd08261a5217def19569ec523
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is designed to host numerous links on disposable domains, a common tactic for phishing or distributing further malware. The embedded URLs point to suspicious domains, reinforcing the phishing or malware distribution vector. No scripts were extracted from this sample, but the overall structure and URL findings strongly suggest a malicious lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://irlanc.ru/uplcv?utm_term=duck+life+adventure+unblocked PDF link annotation
    • http://aaaexpressac.com/userfiles/file/48189247316.pdfIn PDF document text
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/63qfm74dfmhgl6kvt44mtavrn8/babosapemunaxi.pdfIn PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/1b254128c2415a340a319928a8e0ad00/mobutixagabosewexezafesoz.pdfIn PDF document text
    • https://www.db-ynox.fr/ckfinder/userfiles/files/24771813732.pdfIn PDF document text
    • http://feldbach-tourismus.at/files/98921011191.pdfIn PDF document text
    • https://nstoplana.rs/ckfinder/userfiles/files/32657060854.pdfIn PDF document text
    • https://apexsafetyproducts.com/ckfinder/userfiles/files/69037871332.pdfIn PDF document text
    • http://maivietnamesecotati.com/uploads/files/gapabosuw.pdfIn PDF document text
    • http://xn----7sbjvweekof5d.xn--p1ai/files/files/86776687764.pdfIn PDF document text
    • http://orderleesushi.com/uploads/files/nevutuwaxuka.pdfIn PDF document text
    • https://needlugs.com/userfiles/files/wusudetafigovizax.pdfIn PDF document text
    • http://azbuka-d.ru/ckfinder/userfiles/files/nilubuzu.pdfIn PDF document text
    • https://newegys.egyseg.eu/ckfinder/userfiles/files/15301373949.pdfIn PDF document text
    • https://serwisnawigacji.pl/userfiles/file/6755253013.pdfIn PDF document text
    • https://kristaldicarlo.com/userfiles/file/suradidazewovavokusemat.pdfIn PDF document text
    • http://cafegreenwichvillage.com/uploads/files/bofovugobiz.pdfIn PDF document text
    • http://khamranghaiphong.com/upload/files/leladokogimogi.pdfIn PDF document text
    • http://www.aragonemprendedor.com/userfiles/files/12893746797.pdfIn PDF document text
    • https://www.netcorp.hu/data/editorfile/58085128516.pdfIn PDF document text
    • http://elitaliaweb.it/upload/file/13620212821.pdfIn PDF document text
    • https://mtydizayn.com/userfiles/file/83564252414.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://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_off0000b7c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7C7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cfd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFD9 16620 bytes
SHA-256: 477a2df815a4406a16c56f41c074844201aa74890c44b73a9211e5b20d80d0de
font_02_sfnt_off0000fa6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA6A 10700 bytes
SHA-256: db7c8c2ec1593672b3f73c186b2264cf757be294e72224402b465ed79c42d745

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