Malicious PDF — malware analysis report

Static analysis result for SHA-256 be5e1da50ad3aa9a…

MALICIOUS

PDF

83.7 KB Created: 2021-09-21 23:12:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 1cec66c69a72c1ccf5384e92c5a5155d SHA-1: 0b330982d65ab202a78e5e12dfc79f69aaf9ee67 SHA-256: be5e1da50ad3aa9a171795b992f755c7d6dc03193aa8c21ad29a2d7147e12bbb
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to disposable hosting and are structured as link farms, a common tactic for distributing malware or conducting phishing campaigns. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, suggesting it's not intended for direct user reading but rather to host malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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://huntic.ru/uplcv?utm_term=how+to+minimise+data+usage+on+android PDF link annotation
    • http://hakanhurdacilik.com/userfiles/file/41060575541.pdfIn PDF document text
    • https://dalba.net/other_files/File/nikojelefazexinadosu.pdfIn PDF document text
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/6b0cc732448a73a3119818eb30f8efb4/xixirabajat.pdfIn PDF document text
    • https://dovolena-jiznicechy.cz/uploads/18852752449.pdfIn PDF document text
    • http://ksnjl.com/userfiles/files/63794192942.pdfIn PDF document text
    • http://simpelms.nl/userfiles/files/zamawe.pdfIn PDF document text
    • http://wsp.pl/userfiles/file/55493084021.pdfIn PDF document text
    • http://laboratoriodiprogettazione-ve.it/userfiles/files/kovuboxodororax.pdfIn PDF document text
    • http://micruts.org/userfiles/file/6844934406.pdfIn PDF document text
    • https://avukatwebsitesi.kocgrafik.net/upload/files/85146691141.pdfIn PDF document text
    • https://siahotel.com/userfiles/files/beduwoneralixas.pdfIn PDF document text
    • https://nhahangphongcanh.com/uploads/files/zukixetilojozukekopexuzor.pdfIn PDF document text
    • http://kientam.info/uploads/userfiles/file/segatosamudozux.pdfIn PDF document text
    • http://www.supair-lux.hu/ckfinder/userfiles/files/83572395785.pdfIn PDF document text
    • https://motelandratecuci.ro/userfiles/file/60105800139.pdfIn PDF document text
    • https://dogathermalhotel.com/resimler/files/javazipadofodumavurukime.pdfIn PDF document text
    • https://unibel.pl/pliki/upload/file/78132703635.pdfIn PDF document text
    • http://rtm-plus.com/ckfinder/userfiles/files/52482831696.pdfIn PDF document text
    • https://regenerateacademy.com/file/12924817705.pdfIn PDF document text
    • http://ocean-ex.com/images/blog/file/14031083846.pdfIn PDF document text
    • http://tutaylamhet.com/storage/ckfinder/files/117416801.pdfIn PDF document text
    • http://surtek.biz/image/files/20150320_022809.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d8cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8CF 18068 bytes
SHA-256: a048d95f852f06104ad635770539a3d25ac9f92f57d5aedc26115129fb1c696d
font_01_sfnt_off0001077d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1077D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011f94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F94 10724 bytes
SHA-256: f006949e499986a03e57c5751f5219c85c07c215b3a49b73fb2a76dabf6ab106
font_03_sfnt_off000137f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137F5 1804 bytes
SHA-256: 40ce09ec31e5c9a3fb5e0f5b15172400635f0acd87b1afeadc5119a6a0df2b9c

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