Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1afd92f67581ffb…

MALICIOUS

PDF

76.3 KB Created: 2021-09-22 18:55:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d20526e48043290c6b0da7b922a75c71 SHA-1: deb91e99a534e772740c9d9364888d86a9ea994c SHA-256: c1afd92f67581ffbe7022076b2eba84befa4c5c39da90ee7a81600251f03f4a2
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan threat. It contains numerous embedded URLs pointing to various domains, suggesting it functions as a link farm to distribute malicious content or phish for information. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically identifies this pattern, with many distinct hosts and a high number of links per host, reinforcing the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 5

  • 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.
  • 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://catamma.ru/uplcv?utm_term=invaders+inc+mod+apk
    • http://mariancozma.com/_user/file/99129369526.pdf
    • http://nghiencuuykhoa.com/uploads/userfiles/file/98171403610.pdf
    • http://ontozescentrum.hu/tmp/kerijalutezeb.pdf
    • https://shreenathtechnologies.com/userfiles/file/kawomawodoruzedatudo.pdf
    • http://unicaconsultoriarh.com/images/files/58478441522.pdf
    • http://aa-nusd.jp/xekinenavejukajelaru.pdf
    • http://lawfirm.vn/MINH/user_files/file/gezod.pdf
    • http://lepetitjaunais.com/userfiles/file/25064004966.pdf
    • https://pametnidom.hr/pametne_kuce/userfiles/file/44726714134.pdf
    • https://maurinet.com/userfiles/file/75139968605.pdf
    • http://liavanhaeringen.nl/userfiles/files/64783550914.pdf
    • http://nanobubblevietnam.com/uploads/userfiles/file/98520000214.pdf
    • http://budaikepkeret.hu/uploads/file/jiwesag.pdf
    • https://btsmstlucia.com/atomicsteps/upload/userfiles/file/29768477811.pdf
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613a2366d6d3c---55375072146.pdf
    • http://ugrctrani.it/userfiles/files/70158749438.pdf
    • http://montagnobozzone.it/userfiles/files/97130961362.pdf
    • http://ylpcl.com/ckfinder/userfiles/files/40329743477.pdf
    • http://emrc.ie/upload/imagecontent/file/73101998729.pdf
    • https://derechosenred.org/aym_image/files/67196340606.pdf
    • http://studioiulianella.it/userfiles/files/56161503062.pdf
    • http://eko-uklid.com/files/file/11771822113.pdf
    • http://saigondome.com/uploads/userfiles/file/lalegedijozipezobenakigi.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_off0000c34b.bin
d81cde726208fed22fff2fc6a059e3b692a0228ef11b764673827c7b1f97a58c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC34B 18496 bytes
font_01_sfnt_off0000f388.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF388 16792 bytes
font_02_sfnt_off00010b9f.bin
36a8e1b1671fbdbf9bf74a4a29058b4c0bc5168801a4fab7d8337d8c2d135f04		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10B9F 10640 bytes

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