Malicious PDF — malware analysis report

Static analysis result for SHA-256 1dc74aa98c21bd0d…

MALICIOUS

PDF

76.9 KB Created: 2021-09-26 22:58:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a50d038a5c104a55ed367ee75ece86a5 SHA-1: ebefa468328529ff1a876ac168122cef72038b06 SHA-256: 1dc74aa98c21bd0db0eeb0a19e785fd5fed33681b245d5b639852e4e34bb57eb
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to a link farm, with the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicating a pattern of hosting multiple PDFs on disposable domains. This suggests the primary purpose is to redirect users to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://whuntex.ru/userfiles/file/84323767242.pdf
    • http://usagimatur.com/files/others/gowokogezuberepi.pdf
    • http://kredoteka.ru/uploads/file/64552570426.pdf
    • http://ipceurope.be/assets/file/46121169289.pdf
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c64d52e4dd---regosojugiruneremagix.pdf
    • http://frankifoto.com/uploads/pages/files/laxasadezawa.pdf
    • https://futurefacesmiami.com/uploads/file/17654464607.pdf
    • http://jiendurancecoaching.com/ckfinder/userfiles/files/dedulodegufavajiva.pdf
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/q6o2or2euh45odg968mahs9bks/fafumifopadivufoxidopesax.pdf
    • https://fong-cai.com/upload/files/19969804082.pdf
    • http://songhakbbq.com/uploads/files/bunufanegazupe.pdf
    • https://blueparadise.pl/userfiles/file/81532786858.pdf
    • http://duda-tech.pl/dudatech/upload/file/zudowuwibibujuli.pdf
    • https://barcelonamedicalcenter.com/files/galeria/files/62900064012.pdf
    • http://rothemtour.com/FileData/ckfinder/files/20210922_85E8A44133D3F91A.pdf
    • http://radiosalsa.fr/php/rs/filesupload/file/73918772816.pdf
    • https://pmapmc.com/userfiles/image/files/6637590032.pdf
    • http://bckbytow.naszbip.pl/img/upload/files/12768427811.pdf
    • http://3asoft.vn/img/files/51368981275.pdf
    • http://effektfilm.de/files/file/kikapidabafo.pdf
    • http://thaihotelsale.com/FileData/ckfinder/files/20210914_1518C2F20F6F9FC0.pdf
    • https://saikekanglun.com/filespath/files/20210920130146.pdf
    • http://laser-piskovani.cz/democms/userfiles/file/gelidabapob.pdf
    • https://360clothing.in/home/www360cl/public_html/uploads/images/files/22820371165.pdf
    • http://giayviettri.com/img-ftec/files/nuzaludego.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=winner+seung+hoon
    • 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_off0000bcef.bin
31851c626d023787e360466054da2cc38e8cc0d8896268a16bf25fe4e2593595		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBCEF 10176 bytes
font_01_sfnt_off0000d3a9.bin
3e945c9ba5b2b7ce03cdc7c22a44f93cc4c1fc156faaac63a1813e0ed2b1506a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD3A9 22800 bytes
font_02_sfnt_off00010dc4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10DC4 16792 bytes

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