Malicious PDF — malware analysis report

Static analysis result for SHA-256 48dc9ee814566ef6…

MALICIOUS

PDF

69.6 KB Created: 2021-09-26 16:11:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2d87398b0777bb893993b65409aed6bb SHA-1: b69170859130ea8f55cfa018f5784ca614b2d7bb SHA-256: 48dc9ee814566ef60b83d5484a7d7a4d1d82533776a711155c7986b201e28f27
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious File

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is designed to host numerous links on disposable domains, likely for phishing or malware distribution, with one such link pointing to a PDF hosted on 'mrpennarak.com'. The presence of many unknown URLs further supports this, suggesting a campaign to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://mrpennarak.com/user_file/file/38985255857.pdf
    • http://hitecds.com/userfiles/file/nakomobakifulutim.pdf
    • http://tuvanthanhlapcongty.biz/upload/ck/files/23867510179.pdf
    • https://institutdesante.org/userfiles/file/jivaza.pdf
    • http://kopdesign.nl/userfiles/file/tovasezujijejavekewanu.pdf
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1614ade5d58148---36950897876.pdf
    • https://tennis94.fr/img/pics/files/vakin.pdf
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614784fda4e6c---5381668522.pdf
    • http://zzps.pl/userfiles/file/47416732656.pdf
    • http://tg-focus.ru/userfiles/files/98332690429.pdf
    • http://e-sportis.com/images/upload/63630221527.pdf
    • https://www.nhabe.com.vn/ckfinder/userfiles/files/86770345930.pdf
    • http://cn-polylysine.com/d/files/9162674071.pdf
    • https://viboot.traigiongthuha.com/ckfinder/userfiles/files/44200316220.pdf
    • https://sma-dfgg.org/site/admin/file/wopabepebe.pdf
    • https://broadcasthub.com/ci/userfiles/files/kaxarogiwojawibufagoxun.pdf
    • http://honmamon-s.com/img_seminar/userfiles/file/6549155594.pdf
    • http://decamiones.com/userfiles/file/27415660543.pdf
    • https://tidymoney.com/ckfinder/userfiles/files/jodalafi.pdf
    • https://mlspoland.co/files/file/tonemixufe.pdf
    • https://sikahaiphong.com/images/news/files/13924217334.pdf
    • http://vector-mebel.ru/uploads/files/fenemubuxurero.pdf
    • http://ulrike-mayer.de/userfiles/files/soxibifupe.pdf
    • http://hanart21.com/files/userfiles/file/67206061437.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=tekken+3+game+download+for+apk
    • 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_off0000af20.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAF20 16792 bytes
font_01_sfnt_off0000c737.bin
1b90ca8242855958510c0f3b5ec336e468a29f9ca3bd2da71705c4a0bd870ffa		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC737 10796 bytes
font_02_sfnt_off0000dff7.bin
22edbd21fc1b0d3ec97ad6e2614701eeb6c1c066d5618de4c4bd32dfc4ea869b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDFF7 15964 bytes

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