Malicious PDF — malware analysis report

Static analysis result for SHA-256 db7fe1994ed9d7cf…

MALICIOUS

PDF

71.7 KB Created: 2021-09-21 09:07:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 32fe863449940fb49a1eb45aaacab16f SHA-1: 6a6958db7dd5b8052b9bd248bfcbe1a5669e46f0 SHA-256: db7fe1994ed9d7cfcd0817ac6aace2e4bf45479785d59bcbbb5afda43539810b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many of which point to potentially suspicious domains, suggesting a phishing or malware distribution scheme. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this, indicating the document is designed to host a large number of links on disposable domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://rais.bg/uploads/file/sopazazolupuwigaduwedom.pdf In PDF document text
    • https://iqmuseum.mn/uploads/files/63490651907.pdfIn PDF document text
    • http://davidhammerstein.org/userfiles/file/14664819291.pdfIn PDF document text
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/n27vbvekc5se5g6umiek6s6m80/75530868511.pdfIn PDF document text
    • https://navliecky.net/userfiles/file/46560000711.pdfIn PDF document text
    • http://colorfulmedia.de/fotki/fotki/file/tunifukibigumukureji.pdfIn PDF document text
    • https://cupanghitam.com/contents/files/towevezevofajosuxebe.pdfIn PDF document text
    • http://alpha-th.com/userfiles/file/jinuzimobukawerurideso.pdfIn PDF document text
    • http://orderkai.com/uploads/files/kexetasudalugiro.pdfIn PDF document text
    • http://detaycopymatbaa.com/userfiles/file/57579191378.pdfIn PDF document text
    • https://visualmotion.nl/uploads/file/fagagojakiwak.pdfIn PDF document text
    • http://kledingindex.nl/images/uploads/8341822674.pdfIn PDF document text
    • http://kompassztuki.pl/Image/files/didajafej.pdfIn PDF document text
    • https://triyoga-tv.ru/userfiles/file/kazodemotanasupazekige.pdfIn PDF document text
    • http://keemunblacktea.cn/uploads/file/040132431852.pdfIn PDF document text
    • http://e-sportis.com/images/upload/71586347401.pdfIn PDF document text
    • http://uzks.hr/upload/datoteke/tuwirarigox.pdfIn PDF document text
    • http://ledspectrumthai.com/ckfinder/userfiles/files/67916475742.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614932ba87ee7---wanitamenefuvarijapeje.pdfIn PDF document text
    • http://theorientgarden.iorderfoods.com/uploads/files/27840303622.pdfIn PDF document text
    • http://veiligheidsslot.nl/ckfinder/userfiles/files/31831432189.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=property+of+amino+acidsPDF 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_off0000b73c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB73C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cf53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF53 10848 bytes
SHA-256: 9202ef398540cb399f919f8eacabcc89343ac74db981977416891bea311fa8d0
font_02_sfnt_off0000e862.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE862 16224 bytes
SHA-256: 32a9eefd0a5d9b787cdbb544db27fd7a64a3bb9c975a9711cf42e31a4c10377f

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