Malicious PDF — malware analysis report

Static analysis result for SHA-256 659d770729c4d1d2…

MALICIOUS

PDF

68.0 KB Created: 2021-09-27 18:58:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1e5312ef1acd99ff18cabe85815b21b5 SHA-1: f4c8f09de6fab26d9cfe861f9f737e7f1babfd64 SHA-256: 659d770729c4d1d21b240b67e2f4bc70853f861da5a60526d8b1885c2f34a38d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to numerous disposable domains, with one prominent URL being https://smidgel.ru/uplcv. The document body is heavily obfuscated, preventing a clear understanding of its direct intent beyond the link farm behavior.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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://smidgel.ru/uplcv?utm_term=easy+way+to+play+bb+on+guitar
    • http://dobre-jaja.com/Upload/file/mizatatajalezevur.pdf
    • http://ccswcd.com/userfiles/file/gixumewaranotavarajavudu.pdf
    • http://eyela.kr/uploadfile/fckeditor/file/xexixenomuluwazavirido.pdf
    • http://boothbayharborshipyard.com/userfiles/file/40268527761.pdf
    • http://studio-orlandini.com/userfiles/files/96653813433.pdf
    • http://locthanhroyal.com/upload/files/74350135806.pdf
    • https://kisikana.hr/UserFiles/files/5174703189.pdf
    • http://tc-muehlacker.de/data/tcmuehlacker/userfiles/file/ruwikitunas.pdf
    • https://longhoang.vn/upload/files/69781915860.pdf
    • http://hometextiles-consultant.com/ckfinder/userfiles/files/50697245491.pdf
    • http://grotech.in/userfiles/file/visogeramoxatem.pdf
    • http://thrifty-uy.com/files/others/baroxemesiniwagewenim.pdf
    • https://alternativecarrepair.com/userfiles/file/jipumadaxuvurovirekidudum.pdf
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/4cf225eed4408d5bede8b02270ec727b/39689959694.pdf
    • http://onlineauadms.com/ci/userfiles/files/fubugujosev.pdf
    • https://tonymusic.se/UserFiles/files/gorelak.pdf
    • http://synerfreight.com/syner_upload/images/files/mupavanivilabifanelewag.pdf
    • http://fotografoenricogiampieri.it/userfiles/files/15529001574.pdf
    • http://gyn-ordi.at/myPix/file/63637335662.pdf
    • https://fortworthdental.net/cmsCart/upload/file/51469333562.pdf
    • http://newbiesites.com/userfiles/file/vipepulemum.pdf
    • http://ecole-belair.com/ecole/file/55362502407.pdf
    • http://rockpapersun.com/upload_mce_image/file/83486102650.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_off0000ad19.bin
f9427b226d0e6e7b2c5b3c350499d581298dcf3b34d66280a8cdf87000ce894f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAD19 10716 bytes
font_01_sfnt_off0000c5a9.bin
a3b9beee59152dc3cbf4cbe04729bc99c099fe540a4f4312abd783cf8b6980e9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC5A9 14816 bytes
font_02_sfnt_off0000eab2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEAB2 16792 bytes

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