Malicious PDF — malware analysis report

Static analysis result for SHA-256 d59cf98b9923e93d…

MALICIOUS

PDF

71.4 KB Created: 2021-09-30 12:02:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4e2c19141706d941dede906c668407c0 SHA-1: 3086d75f07d3aaa2f2e5f0c27f0b34a3f2a46309 SHA-256: d59cf98b9923e93db19b79c29b5b9e0cc408269c9a1f415d761caa5b2873caa5
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm designed to redirect users to malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests a phishing or malware distribution intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://synerhu.ru/uplcv?utm_term=harley+quinn+birds+of+prey+movie+free
    • https://dm288.com/slicice/file/mazabibo.pdf
    • http://botaierpharm.com/upload/files/tixumimuxivan.pdf
    • http://flyingkirin.com/uploadfiles/file/221901027499.pdf
    • http://tbff-bygg.se/img/files/21272569823.pdf
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/9e6ab16df9fe49122e4c17a63b88d3c6/6053267308.pdf
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/74f76c75d2afc199caa3354590bcbf33/28135265723.pdf
    • http://arqing.es/ckfinder/userfiles/files/lufubuz.pdf
    • https://global-product.org/CKEdit/upload/files/10475558874.pdf
    • http://ceomit.com/fckupload/file/88474528120.pdf
    • https://singhaniabrothersltd.com/ckeditor/ckfinder/userfiles/files/bilanifidoruzotasonefa.pdf
    • http://geopraxis.it/userfiles/files/8480140482.pdf
    • https://wheelmartthailand.com/image/upload/File/11442247832.pdf
    • https://kawanmto.info/contents/files/vuzokali.pdf
    • https://hinodanang.com/uploads/image/files/duzegugafigarixavejiluva.pdf
    • https://immo-macedo.lu/userfiles/files/foritufonini.pdf
    • http://ksnjl.com/userfiles/files/rosalupis.pdf
    • http://zgic.ru/!upload/files/mular.pdf
    • http://playonathletics.com/userfiles/file/dejolunekeravawi.pdf
    • https://drivetripper.com/userfiles2020/files/1450941584.pdf
    • http://krzeptowski.pl/file/lapojozuminavibadikogo.pdf
    • http://livestocktool.com/d/files/92261925345.pdf
    • https://2ruoteexpo.it/ckfinder/userfiles/files/71658057950.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b1a1.bin
c61345dd2727000e152cfddf59085c48fe6e82041beca966dfa028a4d3e8c6d5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB1A1 17384 bytes
font_01_sfnt_off0000de34.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDE34 16792 bytes
font_02_sfnt_off0000f64b.bin
401ec17e3faa71092aec75abe347132d7daccfb7b0ff984e6e8be84969d34c58		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF64B 11120 bytes

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