Malicious PDF — malware analysis report

Static analysis result for SHA-256 819cbf1439705ef0…

MALICIOUS

PDF

69.6 KB Created: 2021-09-18 17:35:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e0b7a634c64e52f265a013070d8616ca SHA-1: 58af2a874c7c2701fc42b3ec229a8ce74a10e0c3 SHA-256: 819cbf1439705ef0ffdea8d143754706afa481827b235d18a6d2009a7ff11091
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, with many pointing to disposable domains, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and link farm heuristic suggest it's designed to redirect users to malicious websites, potentially for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://uleshuzatabc.hu/files/file/pupukikunaxemexeb.pdf
    • http://terremeraude.com/userfiles/file/xutedolubetesofa.pdf
    • http://mtjjt.com/2013/upload/article/files/2109010756117634683u36m.pdf
    • https://cochleartudaskozpont.hu/files/25875694106.pdf
    • http://tipiland.net/upload/file/negezijo.pdf
    • http://shortguycentral.com/ck_uploads/files/sunefizamevokidiloze.pdf
    • http://seanmore.com/userData/board/file/94774499175.pdf
    • http://www.its-dph.cz/admin/fckeditor/editor/userfiles/file/35823817435.pdf
    • http://methese.com/upload/files/91985138424.pdf
    • https://bohemiamaestro.com/webpagebuilder/ckfinder/userfiles/files/13246638551.pdf
    • https://masini-de-ambalat.ro/images/userfiles/zugoxitipemagetevogekota.pdf
    • https://hotelmitrutarija.com/uploaded/files/71736617677.pdf
    • https://culturasiapamplona.com/guiarte_userfiles/files/samasak.pdf
    • http://crmloccitanecr.com/campannas/file/25976000967.pdf
    • http://nanoservice.cz/upload/file/52405183334.pdf
    • http://jlicentral.com/images/authors/file/73509301174.pdf
    • http://studiopignotti.it/userfiles/files/jevodago.pdf
    • http://otpetye.com/images/shared/file/83340520860.pdf
    • http://cpils.com/userfiles/file/32972437338.pdf
    • https://rzfmuhasebe.com/userfiles/file/40062949855.pdf
    • http://spl-designs.com/ckfinder/userfiles/files/texuzosebe.pdf
    • https://mldom.xyz/web/img/podborky/files/zekarakeziku.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=app+home+chromecast
    • 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_off0000b290.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB290 16792 bytes
font_01_sfnt_off0000caa2.bin
95065a3f1fe97a0e081771a4856d91743bd37a4f9a458c311553a408e6c6efcd		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCAA2 15436 bytes
font_02_sfnt_off0000f1d6.bin
b31e7730168645eb5b637c52cac63cedbfdefcd9f7878f8de471c2c05a3a6664		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF1D6 10376 bytes

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