Malicious PDF — malware analysis report

Static analysis result for SHA-256 02351d43e7b243af…

MALICIOUS

PDF

71.1 KB Created: 2021-09-10 15:09:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 68e2495c24ebf1aa144d6e3e43e6a0c8 SHA-1: d9832c0a7be4cbb40100d318c553c1c7a3706c9a SHA-256: 02351d43e7b243af5d2296f9d192c93ac8c92b75c0f00a650eae72a0fdbb9163
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document flagged by ClamAV as Pdf.Phishing.Trojan. Heuristics indicate it functions as a link farm, embedding numerous URLs on disposable hosting, with one URL specifically mentioning a game download. The ML classifier also strongly indicated maliciousness. While no scripts were extracted, the PDF structure and embedded URLs suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://synerhu.ru/uplcv?utm_term=crash+bandicoot+3+psp+download PDF link annotation
    • https://imihwa.com/uploads/image/20210904/files/20210904023607.pdfIn PDF document text
    • http://blueyee.com/upload/file/100013044227.pdfIn PDF document text
    • https://oferta.lt/i/File/12548240538.pdfIn PDF document text
    • http://uniquehotelsolutions.com/files/others/8124936741.pdfIn PDF document text
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/fae3ba7cbab09178bcd119ff0d6ea382/62411163210.pdfIn PDF document text
    • https://totalsewa.com/userfiles/file/mubovanaz.pdfIn PDF document text
    • https://unitedfightalliance.com/ckfinder/userfiles/files/67189617232.pdfIn PDF document text
    • https://diedacorporation.net/freesiafiles/file/99085395820.pdfIn PDF document text
    • https://projekt-lesen.de/userfiles/file/35173999129.pdfIn PDF document text
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/7986776cfedf76ee2ff0853705f5dffd/53850849816.pdfIn PDF document text
    • http://theeultimatenetworker.com/ckfinder/userfiles/files/torazodokezawevukab.pdfIn PDF document text
    • http://www.psoealora.es/ckfinder/userfiles/files/45530389236.pdfIn PDF document text
    • https://www.mediawerf.nl/bundles/store24backoffice/ckfinder/userfiles/files/25557802176.pdfIn PDF document text
    • http://joeun-it.com/userData/board/file/puxomilivuxujuzotunigik.pdfIn PDF document text
    • http://jiehuist.com/userfiles/files/67068201331.pdfIn PDF document text
    • https://searchlink.org/userfiles/file/xoluzizi.pdfIn PDF document text
    • http://yachtandgulet.com/userfiles/file/40729037660.pdfIn PDF document text
    • http://roycraft.ca/userfiles/file/17867435487.pdfIn PDF document text
    • https://citronel.com/userfiles/files/pitotogavababoziratis.pdfIn PDF document text
    • http://jca-t.com/fck_image/file/xakexova.pdfIn PDF document text
    • http://aydinservis.com/ckfinder/userfiles/files/4495255444.pdfIn PDF document text
    • http://darstin.com/userfiles/files/xifirevad.pdfIn PDF document text
    • https://kme.pl/global/app/webroot/uploads/file/16308045830789.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_off0000b5df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5DF 10908 bytes
SHA-256: 4718230abac7f824485b152fd4dd3eacceba99cb3b28f1eecf4b2ecaffc00b92
font_01_sfnt_off0000ceeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEEB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e6fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6FD 15528 bytes
SHA-256: daaa4f03ef5196819e913c63a1f04fdebf388e4235fda6e3d81e116177c5f3a6

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