Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ce4b1acbcd53952…

MALICIOUS

PDF

69.2 KB Created: 2021-10-01 02:28:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 65bc14337ef73e7316f685bcaf37acd8 SHA-1: 49dfa46c9a0a90e17d34a41b2714e715cca63211 SHA-256: 8ce4b1acbcd53952b7805e9cf0baf4f3061def6679c613fe609ba830e5ada351
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to various PDF files hosted on different domains, suggesting a link farm or distribution network. The presence of external URIs and the overall structure indicate an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/1614affb39d8ac---99144530737.pdf
    • https://honkakuji.jp/honkakuji/images/ckfinder/files/jejebof.pdf
    • https://mavachhaiphong.com/upload/files/faxopifafa.pdf
    • http://arcos-eff.it/userfiles/files/pufojuzef.pdf
    • https://vibangthuaphatlai.net/uploads/files/wikivorigivu.pdf
    • https://techson-cctv.com/upload/file/81791565414.pdf
    • http://profitoolinfo.ru/ckfinder/userfiles/files/telifevule.pdf
    • https://prestinieurope.ch/userfiles/files/70651738450.pdf
    • http://dongzzang.com/userfiles/file///63747772090.pdf
    • https://southafricapools.com/contents/files/favegopiketiraxukelusefo.pdf
    • http://henanshuangxin.com/d/files/najapexog.pdf
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/ei7lln7eqqp0bgbblr0g5klug7/46188427444.pdf
    • https://biodent.ro/m4fm_files/m4news/ck-uploads-files/8071157048.pdf
    • http://deborahkay.com/ckfinder/userfiles/files/malodapuk.pdf
    • http://ilovehikari.com/uploads/files/34033277221.pdf
    • http://plncse.hu/php_data/file/vovugupavedo.pdf
    • https://computerzone.pk/file/76757708323.pdf
    • http://strandedtattoo.net/file/63048474070.pdf
    • http://anhuishangbiao.com/upload_fck/file/2021-9-16/20210916221614554342.pdf
    • https://www.bevillelecomte.com/ckfinder/userfiles/files/59900059570.pdf
    • http://cbestdesign.com/ckfinder/images_store/files/sanikinuduzavar.pdf
    • https://bloomland.com/sites/bloomland.com/files/45479094601.pdf
    • http://evevoyance.fr/adh/.-/file/levumidujediregure.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=how+to+restart+iphone+xr+without+power+button+and+frozen+screen
    • 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_off0000b0be.bin
a22484f6e2bf300284d981ec8580338751fce9e411df9660c9c988765b2d28a5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB0BE 14380 bytes
font_01_sfnt_off0000d4d1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD4D1 16792 bytes
font_02_sfnt_off0000ece8.bin
ba3f4e472afcf2fe04a127e92e5f3b008e627416e2bae7df1d04ba1b0a9da4af		 pdf-font-stream PDF embedded font (sfnt) at offset 0xECE8 11148 bytes

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