Malicious PDF — malware analysis report

Static analysis result for SHA-256 15f5e6169a521c0a…

MALICIOUS

PDF

88.7 KB Created: 2021-09-12 05:13:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8ec0b1f2a2534d34e6310f5c5bd0d48c SHA-1: 7d35b67aee82783b90a10e96448ddc61c2375a89 SHA-256: 15f5e6169a521c0ac919d17dc885b4883206ef8f40497907c84d8b86e3108a61
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, with a high heuristic indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. Although no scripts were directly extracted, the PDF structure and embedded links are indicative of a malicious lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9940

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://zavalinka.by/var/upload/file/83106055199.pdf
    • http://snsi.jp/image/news_file/wigebukevamoniguk.pdf
    • https://cobrawire.com/userfiles/files/88465621987.pdf
    • https://www.ebenisterie-burette.com/ckfinder/userfiles/files/66171636148.pdf
    • http://portableandcool.com/files/files/vomivitubikilug.pdf
    • https://amt-alarmy.pl/userfiles/file/vizimofawepititaxewewaju.pdf
    • http://grafosaleservice.cz/images/fck_editor/file/11436951999.pdf
    • http://dulichtantai.com/files/uploaded/files/87445633195.pdf
    • http://alteredcompta.com/buddha/ckfinder/userfiles/files/17567801729.pdf
    • https://www.indee-r.fr/wp-content/plugins/super-forms/uploads/php/files/c271f06513a56c73da992e6f8c2fc08c/pugowulen.pdf
    • http://tccsrl.org/userfiles/files/xikagobibotinid.pdf
    • http://carrasvilla.es/uploads/files/nataxifetabefukosi.pdf
    • http://machin.kr/userData/board/file/79157440394.pdf
    • http://murielbellhomes.com/userfiles/files/tirumaki.pdf
    • http://recko.ru/ckfinder/userfiles/files/27809307691.pdf
    • http://hejia-ele.net/upload/85686516954.pdf
    • http://ms2oke.com/contents/files/sodonilamakojenogija.pdf
    • https://autoteam.in/ckfinder/userfiles/files/29052528201.pdf
    • http://toyotarent.tw/FileData/ckfinder/files/20210904_04F18C6A27180538.pdf
    • https://nazrabilisim.com/calisma2/files/uploads/nefagom.pdf
    • http://pepinieres-soupe.com/userfiles/file/624618014.pdf
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ba8d1263a7---85627026046.pdf
    • https://sasalidayanisma.org/uploads/file/92516890353.pdf
    • http://agriturismocorteerbatici.it/userfiles/files/bimavimirijamederixukexuj.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=fury+shot+3d
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d478.bin
e06ebeaa2bb94d9bf14337b0794fec2c9c4a66e30291689b6f6234bfe360c8a5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD478 16232 bytes
font_01_sfnt_off0000ea5c.bin
ecbfb94f06575f481541e563b83bf2b7dd3e9dcf08152f539909fa314a510db7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEA5C 10172 bytes
font_02_sfnt_off00010158.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10158 16792 bytes
font_03_sfnt_off0001196a.bin
cefa4f2eb20e3fdacd64d3822576e9c7e93d3ef84c9772bcaa8225bebac13d3b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1196A 22832 bytes

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