Malicious PDF — malware analysis report

Static analysis result for SHA-256 a44b0893776270fa…

MALICIOUS

PDF

80.5 KB Created: 2021-09-13 10:01:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 524549b6b29d50b0dc5cd70a9c6ec465 SHA-1: 0fc9116ac1039ae6d16daad35c3942ff359d7f77 SHA-256: a44b0893776270fa36cce0eb8fa3f1356e4885a6e72d1a4a43fe0ceaa50b95a5
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to suspicious domains, and one heuristic identifies it as a link farm. While no scripts were explicitly extracted, the nature of the embedded URLs and the detection signatures suggest an intent to redirect users to malicious sites, likely for phishing or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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 http://autovoda.ru/upload/files/wefutajugakeniki.pdf In PDF document text
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613bbf59b687a---2605386574.pdfIn PDF document text
    • http://fred-robin.com/ckfinder/userfiles/files/87514713435.pdfIn PDF document text
    • http://ssaisarang.com/ckfinder/userfiles/files/fifanovidiwepeduseledul.pdfIn PDF document text
    • https://lotte-ppta.net/beta/assets/file/gigakuzenosorewewavelez.pdfIn PDF document text
    • http://auto-rad.pl/userfiles/file/38672186360.pdfIn PDF document text
    • http://4seasonstours.in/userfiles/file/mezodiwonovok.pdfIn PDF document text
    • https://milsagliksen.org/upload/ckfinder/files/48112164696.pdfIn PDF document text
    • https://moderator.lt/components/com_mijoshop/opencart/image/data/files/mipedofugamexopitusesoki.pdfIn PDF document text
    • http://kantipursecurity.com/userfiles/file/vogimevup.pdfIn PDF document text
    • http://muacuoi.vn/Pictures/files/10799112698.pdfIn PDF document text
    • http://meimagedance.tw/ufiles/files/41259446415.pdfIn PDF document text
    • http://perfect-gallery.com/userfiles/file/xipapibeve.pdfIn PDF document text
    • https://blagoustroystvo24.ru/ckfinder/userfiles/files/genaketaxivugusawile.pdfIn PDF document text
    • http://forma8.kz/ckfinder/userfiles/files/mijarakikenuroz.pdfIn PDF document text
    • http://rnralpha.cz/res/file/46241625957.pdfIn PDF document text
    • https://elitstroycraft.ru/source/file/22342379965.pdfIn PDF document text
    • https://sona3elkhair.com/userfiles/file/6497163678.pdfIn PDF document text
    • http://octapus.vn/images/uploads/files/xiligidu.pdfIn PDF document text
    • https://leonardscopysystems.com/home/leonards/public_html/ckfinder/userfiles/files/78732083961.pdfIn PDF document text
    • http://jcbcharpentebois.com/ressource/site-image/files/vezino.pdfIn PDF document text
    • http://rioairporttransfer.com/ckfinder/userfiles/files/tojokifegow.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=happy+hack+clash+of+clansPDF link annotation
    • 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_off0000d748.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD748 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ef5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF5A 17840 bytes
SHA-256: 7a404c671dc11b03e8667ee37b25f4ee0cdf690f183cb3a26156a7ce9d9b3db4
font_02_sfnt_off00011da8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DA8 10352 bytes
SHA-256: d655a01f1c886cb021e5f87a4130c5d9da4c9ce388c2a06de0f386a3bd0ac40b

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