Malicious PDF — malware analysis report

Static analysis result for SHA-256 34e5222507a87992…

MALICIOUS

PDF

67.0 KB Created: 2021-09-29 10:07:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 25f4270da37545de0be9ede55a8daf62 SHA-1: bddab2a6e2d7a60a27dde0becfe3334015351bd3 SHA-256: 34e5222507a87992df80f64d7220805e7c421ceaef78abfed0a9edeba99ab257
146 Risk Score

Malware Insights

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

The PDF is identified as an image-only lure, typical of phishing campaigns, with a high ML score and ClamAV detection confirming maliciousness. It contains numerous embedded URLs pointing to disposable domains, suggesting it's part of a link farm designed to distribute further malicious content or lead to phishing sites. The presence of PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics strongly indicates a malicious intent to redirect users to external, potentially harmful, resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 67 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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=celebrity+house+adopt+me PDF link annotation
    • http://nuraski.pl/wsg/userfiles/lidilipi.pdfIn PDF document text
    • http://longthinhphat.net/uploads/files/xifigawosa.pdfIn PDF document text
    • http://lamorenj.com/userfiles/file/lalewotaleteperakunuki.pdfIn PDF document text
    • http://bulmarconsult.com/files/gewupasisidokepituleto.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/161521f7985932---50368085337.pdfIn PDF document text
    • http://tiramisu-o.com/yamituki-n/uploads/files/91124354218.pdfIn PDF document text
    • http://futuralagoparking.eu/userfiles/files/10866003681.pdfIn PDF document text
    • http://xn----9sbbnbtte4cyg.xn--p1ai/ckfinder/userfiles/files/rajijadelofamifozosu.pdfIn PDF document text
    • http://cw-cut.com/uploads/file/77761354925.pdfIn PDF document text
    • https://vidaleve.ind.br/ckfinder/userfiles/files/semapejewaxokudox.pdfIn PDF document text
    • http://yetisirkaucuk.com/firma/files/liwutidi.pdfIn PDF document text
    • http://architettobotteonpierpaolostudioabacus.it/userfiles/files/8469193715.pdfIn PDF document text
    • http://newabel.com/ckfinder/userfiles/files/bufodefopovalom.pdfIn PDF document text
    • https://redac.ch/upload/lemupor.pdfIn PDF document text
    • http://educasters.co/ckfinder/userfiles/files/45027908188.pdfIn PDF document text
    • http://www.thunderesp.com/ckfinder/ckfinder.htmlfiles/28899482042.pdfIn PDF document text
    • https://braveathlete.net/geektic/files/28591454967.pdfIn PDF document text
    • https://e-fasteners.eu/media/file/58525181135.pdfIn PDF document text
    • http://potentialdesign.cn/userfiles/file/1630587750.pdfIn PDF document text
    • http://okna-kurska.ru/page_edit/_samples/userfiles/files/tuwoduzuzagutidevumuvi.pdfIn PDF document text
    • http://szcftz.com/upload/1342070290.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_off0000aae9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAAE9 13988 bytes
SHA-256: 9c2a9febb5c2006caae660e13d414b345ad5429534c6289949938bf6397d96e9
font_01_sfnt_off0000cdd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDD3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e5ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5EA 10940 bytes
SHA-256: 598a29b6280330550de6bd77d7ecf8d7f78a93e4f76a349856f56b0c60df2248

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