Malicious PDF — malware analysis report

Static analysis result for SHA-256 e655f5cdfdc9ac8e…

MALICIOUS

PDF

82.3 KB Created: 2021-09-19 02:23:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 2718929baa41933ce9b9143ba006de65 SHA-1: f48d8536ee246e0a14ae2b7cb9dd38182f86fb0b SHA-256: e655f5cdfdc9ac8eb7dc4ca11cf581911c398b80d81cdca7631a3a40281bebbb
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous embedded URLs pointing to disposable hosting, characteristic of link farms used to obscure malicious destinations. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic confirms this behavior, indicating a high likelihood of phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://laborke.ru/uplcv?utm_term=how+to+remove+a+snapchat+lens+from+a+photo PDF link annotation
    • https://cristalensi.com/public/File/93469090722.pdfIn PDF document text
    • http://primebrokeragetx.com/ckfinder/userfiles/files/90179745177.pdfIn PDF document text
    • http://xn--12cfu9bc1efac9a9azfdsb7b9d1f0j.net/ckfinder/userfiles/files/24124625504.pdfIn PDF document text
    • http://trevorhannant.com/xexuweloterimawul.pdfIn PDF document text
    • http://circolonauticofavignana.it/userfiles/files/50150501483.pdfIn PDF document text
    • https://atrax.eu/userfiles/file/65992475489.pdfIn PDF document text
    • http://elite-nails.pl/Upload/file/muzisu.pdfIn PDF document text
    • http://bamboomfi.com/htdocs/cljr/data/files/pulijolevigepagotok.pdfIn PDF document text
    • http://dh-cell.net/ckfinder/userfiles/files/1715813618.pdfIn PDF document text
    • https://oklogistic.lv/upload/file/40967330097.pdfIn PDF document text
    • http://naturestuff.nl/siteimages/file/21797656150.pdfIn PDF document text
    • http://computer-rudolstadt.de/upload/file/nedurobisodog.pdfIn PDF document text
    • https://afritransport.com/app/webroot/files/file/77839658034.pdfIn PDF document text
    • http://twtipa.com/upfile/files/2021/09/12/kamepodesasokasuxifa.pdfIn PDF document text
    • http://akcihlar.cz/userfiles/file/12525966044.pdfIn PDF document text
    • http://motocams.cz/ckfinder/userfiles/files/lisejozogegobelo.pdfIn PDF document text
    • https://vidaleve.net/ckfinder/userfiles/files/86490784087.pdfIn PDF document text
    • http://horizonpestservices.com/userfile/84192785510.pdfIn PDF document text
    • http://www.sevenchurchestour.net/seven/wp-content/plugins/formcraft/file-upload/server/content/files/16130325dc7305---joxawok.pdfIn PDF document text
    • http://stavo-bazar.cz/userfiles/file/wolida.pdfIn PDF document text
    • http://xn--80aaaaadfwa5aftjhxrkcrg8iwc.xn--p1ai/pict/file/lomoxawutifetomisuta.pdfIn PDF document text
    • https://cardolf.ro/files/29489456509.pdfIn PDF document text
    • https://assofmt.org/ckfinder/userfiles/files/vopizezubatijon.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_off0000da8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA8F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f2a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2A1 18488 bytes
SHA-256: 08f25b3c057bd63314fbc565f5d42846d306f0ce1a402fede12d5af862861346
font_02_sfnt_off0001227c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1227C 10796 bytes
SHA-256: ca632be4cb8ce08bfc7e547f87e59d037efa5b3465f6c16aadce3e89243721dd

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