Malicious PDF — malware analysis report

Static analysis result for SHA-256 31075b6c0265768a…

MALICIOUS

PDF

69.0 KB Created: 2021-10-01 13:56:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: abdee64b16b2324f27d8f75943aeec7c SHA-1: fda99d82d0562a4dd225295d6ebdced3102ba3ce SHA-256: 31075b6c0265768a9146527825f9455572402364625a200ff80ef9e6abf54801
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and numerous external URIs pointing to disposable hosting, indicative of a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 https://oniceh.ru/uplcv?utm_term=yandamuri+veerendranath+books+pdf PDF link annotation
    • https://gres-k.cat/userfiles/file/27277431376.pdfIn PDF document text
    • https://holcom-wd.com/webroot/img/files/86947346089.pdfIn PDF document text
    • http://aucoindeshalles.fr/menu/file/58841445461.pdfIn PDF document text
    • http://jhdjt.com/images/upload/File/48743707847.pdfIn PDF document text
    • http://jandenzobv.com/image_uploads/file/xogezofezorusidirod.pdfIn PDF document text
    • http://korsorlampang.net/user_img/files/10140895573.pdfIn PDF document text
    • https://basundharamart.com/userfiles/file/62956798985.pdfIn PDF document text
    • https://ptogel1.com/contents/files/56131915950.pdfIn PDF document text
    • http://hengtongblower.com/d/files/72916871562.pdfIn PDF document text
    • http://police8coop.com/UserFiles/file/99853601122.pdfIn PDF document text
    • http://konberdbio.com/upload/files/97526948865.pdfIn PDF document text
    • http://www.elstar.ru/uploads/files/469741189.pdfIn PDF document text
    • http://akekaluck.com/ckfinder/userfiles/files/24678535562.pdfIn PDF document text
    • http://kleinschadenexpert.de/userfiles/file/52349688233.pdfIn PDF document text
    • https://lawtutors.co.uk/js/ckfinder/userfiles/files/sivumipomajorujiwa.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614b927a467a5---38092123860.pdfIn PDF document text
    • http://kd-council.com/upfile/files/30808791063.pdfIn PDF document text
    • https://irepairplus.nl/app/webroot/files/userfiles/files/pebilu.pdfIn PDF document text
    • http://yokosohk.com/files/fckfiles/file/jewigejitiwu.pdfIn PDF document text
    • http://dolinakrzeptowa.pl/public/upload/ckfinder/userfiles/files/80715605881.pdfIn PDF document text
    • http://rilta.net/userfiles/files/12592936371.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/161489f5592d26---51067118809.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_off0000ad98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAD98 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c5af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5AF 11100 bytes
SHA-256: a2b0a92833e13bd0fe86dbdf30d15ece0a0828efbae94da6b7a84c13313887d5
font_02_sfnt_off0000df1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF1C 15688 bytes
SHA-256: accdfff50c80375e8776ed7ed8cdf8f88612fd13c517a403aa0a616a554f24b0

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