Malicious PDF — malware analysis report

Static analysis result for SHA-256 9583463797c4451c…

MALICIOUS

PDF

68.6 KB Created: 2021-09-17 09:58:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: cf2da7d63cf4cbceec637d8649941b54 SHA-1: ad2fcffd95f16191c701a1b73f8c8f2150b5f320 SHA-256: 9583463797c4451c1067a22b891a0fd4798c063ddd15ca59b473ff910713d3e9
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external URIs and is described as a link farm on disposable hosting, indicating a likely attempt to redirect users to malicious sites. Although no scripts were explicitly extracted, the PDF structure and heuristic firings suggest it's designed to exploit users through deceptive links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

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://catamma.ru/uplcv?utm_term=sexy+game+mobile PDF link annotation
    • http://wildpflanzen-planung.de/file/sobezutevusobefowo.pdfIn PDF document text
    • http://ryanoomen.nl/uploadimages/files/sevamazebugofexunufe.pdfIn PDF document text
    • http://ouhkpthaa.org/userfiles/8420440359.pdfIn PDF document text
    • http://delve-cr.com/uploads/benefufumofira.pdfIn PDF document text
    • http://getsolarny.com/userfiles/file/75587113773.pdfIn PDF document text
    • https://lederstuhl-shop.de/ckfinder/userfiles/files/30955564140.pdfIn PDF document text
    • https://dienhoanghean.com/upload/ck/files/zoludewigudagufided.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16130077c43dff---tadujekagebarepe.pdfIn PDF document text
    • http://xaydungphongphu.com/uploads/files/79956090882.pdfIn PDF document text
    • http://ramenhajimetustin.com/uploads/files/2242485872.pdfIn PDF document text
    • http://targhevaticane.it/userfiles/files/11011302326.pdfIn PDF document text
    • http://deforma.it/userfiles/files/jakukufexagogeza.pdfIn PDF document text
    • https://petandpuppies.com/userfiles/file/11906050516.pdfIn PDF document text
    • https://novsport.com/content/File/wovozevomuliwu.pdfIn PDF document text
    • https://pacantioquia.org/aym_image/files/nezawinawagurevu.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613d461655016---butesumu.pdfIn PDF document text
    • http://www.salpasafarit.fi/tiedostot/files/miriwadexodelikekibupog.pdfIn PDF document text
    • https://projekt-lesen.de/userfiles/file/71192515562.pdfIn PDF document text
    • http://otevrel.eu/ckfinder/userfiles/files/molevakowozobed.pdfIn PDF document text
    • https://aspaeng.com/files/image/files/71262793115.pdfIn PDF document text
    • http://sys-svinding.dk/userfiles/file/mupalisujafexasuxumow.pdfIn PDF document text
    • http://cuanhuadanang.vn/uploads/image/files/dorulodat.pdfIn PDF document text
    • http://busto-wl.gattinonimondodivacanze.it/themes/userfiles/files/69983226713.pdfIn PDF document text
    • http://cnokorea.com/userfiles/file/81030584706.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_off0000adf7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xADF7 15136 bytes
SHA-256: 8e8a4e141e6298037ac13dca31cd07f2938777b2096c26958ae079344cd7c064
font_01_sfnt_off0000d41d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD41D 10412 bytes
SHA-256: 338e6b2c255e6122090005fc47b7add7671908d4dc38cfaf1337cb745f400ccb
font_02_sfnt_off0000ebc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBC6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1