Malicious PDF — malware analysis report

Static analysis result for SHA-256 ede97c6a4b2b163a…

MALICIOUS

PDF

81.9 KB Created: 2021-09-16 15:29:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 99df2488b742798362f5f58e2859150e SHA-1: abeee9444b0b5209b5295f0825593c5487bc9c4c SHA-256: ede97c6a4b2b163aa12f5d59a279914c3469c21caac088eed0a73a035123e231
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a high number of external URIs, many of which are hosted on disposable domains, indicating a link farm for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or trojan delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://koddous.com/userfiles/file/80340359594.pdf In PDF document text
    • http://ficfart.org/userfiles/file/13750003019.pdfIn PDF document text
    • http://shijijiaming.net/filespath/files/20210915145223.pdfIn PDF document text
    • https://emailing-online.fr/uploads/userfiles/file/kewufesotaveboxeg.pdfIn PDF document text
    • http://vivaldiskibus.com/FileData/ckfinder/files/20210911_115CD5A2E0BDA8D9.pdfIn PDF document text
    • http://dakhoanhanai.com/images/files/wiwumowigelitekobobe.pdfIn PDF document text
    • http://aurastaffing.es/upload/file/wigosob.pdfIn PDF document text
    • http://agriturismolataggiasca.eu/userfiles/files/5594998283.pdfIn PDF document text
    • http://grimastone.ru/files/44281085802.pdfIn PDF document text
    • http://francescasciortino.it/userfiles/files/wekujesejozugopabub.pdfIn PDF document text
    • http://effekt-film.de/files/file/7946957425.pdfIn PDF document text
    • http://ristoranteyuri2.com/userfiles/file/16811487163.pdfIn PDF document text
    • http://aumnat2car.com/ckfinder/core/connector/php/upload/files/mexuwotorumagex.pdfIn PDF document text
    • http://gaia-onlus.org/userfiles/file/49054366381.pdfIn PDF document text
    • https://whitesal.com/data/images/file/3788_20210905150947.pdfIn PDF document text
    • http://elma-itc.ru/!upload/files/257025276.pdfIn PDF document text
    • http://duhochoangthanh.com/upload/files/69095144930.pdfIn PDF document text
    • http://ceraunavoltapizzeria.it/userfiles/files/ravononopogagi.pdfIn PDF document text
    • http://www.siphonicflowmandiri.com/upload/files/vefogubunuwu.pdfIn PDF document text
    • http://garageanything.com/js/upload/files/xumeziwotibotetosogiz.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613d01c540727---lilekufomo.pdfIn PDF document text
    • http://dietetyka-24.pl/images/files/16890796604.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/lisute.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=sony+ericsson+txt+pro+whatsappPDF 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_off0000d7c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7C2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000efd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFD9 10800 bytes
SHA-256: c04020563270ae04523a3295fd2064124140e9abfafd5b8ef483f70e044fdbe0
font_02_sfnt_off000108c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108C5 19284 bytes
SHA-256: a126520e3594d176556b8118a1ff10e4e75a8849840862c7b7509bc4e2a75c3f

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