Malicious PDF — malware analysis report

Static analysis result for SHA-256 4260663c7f4250a3…

MALICIOUS

PDF

68.7 KB Created: 2021-09-29 00:33:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 639713278e90e1f46dec73f2bf9cd393 SHA-1: e33e2af3f79ce5066244bae1ecc6dbafb880754c SHA-256: 4260663c7f4250a35f1e426335aefd535b9c8c0ed00cbdd64d523b71c41b5bf9
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing lure. It contains an image-only design with a click-outward action, typical for directing users to malicious websites. The document body is heavily obfuscated, but the presence of numerous external URIs, including one pointing to 'medvor.ru', suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 68 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://medvor.ru/uplcv?utm_term=fb+lite+game+download
    • http://ldkxzzs.com/images/userfiles/file/40994392084.pdf
    • http://jj-metals.com/userfiles/file/2021092718150873499.pdf
    • https://chingchia.com/uploads/files/202109221818383190.pdf
    • https://valeaflorilor.ro/img/uploads/file/malipekoxos.pdf
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c5c1042068---59435465013.pdf
    • http://amsaneeraus.fi/userfiles/files/kejapiluvusadozezowut.pdf
    • http://kosmonautika.ee/ckfinder/userfiles/files/32096045894.pdf
    • https://combrooncom.com/contents/files/jidezimoladusinipufafa.pdf
    • http://discus-rus.ru/upl/file/ruxijido.pdf
    • http://arnoldbolingbroke.com/ckfinder/userfiles/files/kabalotatirexa.pdf
    • http://booklandbooks.com/userfiles/file/rumosadutudojisugavuvob.pdf
    • https://s-serviss.lv/userfiles/file/rijupezitet.pdf
    • http://vanprodukt.cz/UserFiles/File/20565729971.pdf
    • http://doremimarlikinsaat.com/userfiles/file/motizonuweg.pdf
    • http://progettarecasa.com/userfiles/files/biwudugeriregade.pdf
    • http://rallyteamwalraven.nl/file/51182411766.pdf
    • https://www.southdownscellars.co.uk/ckfinder/userfiles/files/64811510861.pdf
    • http://cistenivytahu.cz/upload/file/taxiwarew.pdf
    • https://baatco.com/ckfinder/userfiles/files/24605906841.pdf
    • http://tainanrup.longi.tw/uploadfiles/files/20210926_153038_4582.pdf
    • http://reklama-v-sochi.com/ckfinder/userfiles/files/30805433157.pdf
    • https://inprovitcolombia.com/ckfinder/userfiles/files/mepage.pdf
    • http://crm333.com/documentos/file/62827787608.pdf
    • https://avphunter.ro/ckfinder/userfiles/files/baxakaziboxubijefofevo.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_off0000b17d.bin
133dd5a045d82bdde8317a2fd66e50397cd421837919091793bae79ccb850a7c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB17D 14448 bytes
font_01_sfnt_off0000d55a.bin
0646cb7720e950d3520c49b4299188e1199ec1eff506e8302fb5582e9b3a66a6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD55A 10524 bytes
font_02_sfnt_off0000ed1e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xED1E 16792 bytes

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