Malicious PDF — malware analysis report

Static analysis result for SHA-256 17d036f300962367…

MALICIOUS

PDF

72.9 KB Created: 2021-09-14 05:48:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: a42b9cb2c37a8cf2b898519d6166e0b9 SHA-1: 6ecb99673e67853bc3afc0670ef719b3976fbf25 SHA-256: 17d036f3009623675e962d5147518a6d78f31d52e84e07cceb38a0f7176cfdaf
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to numerous external PDF files hosted on various domains. While no scripts were directly extracted, the nature of the link farm suggests an intent to distribute further malicious content or engage in SEO abuse.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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://monthclean.com/uploads/files/202109060834425190.pdf In PDF document text
    • http://gazosilikatnn.ru/uploads/files/18992844165.pdfIn PDF document text
    • https://oldd.adventurenetbg.com/userfiles/file/desaregemegajuponoxoroj.pdfIn PDF document text
    • http://ptichile.cl/userfiles/file/mudug.pdfIn PDF document text
    • http://areaengineeringsrl.eu/userfiles/files/10613117723.pdfIn PDF document text
    • http://dui-antidote.net/images/userfiles/file/pibemelatenuzex.pdfIn PDF document text
    • https://markiza-trade.ru/admin/ckfinder/userfiles/files/lalawosixafevumujoxojepux.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/16131cfe2297a3---zagitakokilipaji.pdfIn PDF document text
    • http://przyrodnik-kujawy.eu/userfiles/file/89993744815.pdfIn PDF document text
    • http://pwmtqatar.net/userfiles/file/65573293013.pdfIn PDF document text
    • https://0922.sproname.com/files/userfiles/files/rogafididukedolowururiwaw.pdfIn PDF document text
    • http://geobigoni.it/userfiles/files/wujifegexiwudimefos.pdfIn PDF document text
    • https://nhahangthanghuong.com/uploads/files/dulunolifipotilibazib.pdfIn PDF document text
    • https://girl0229960192.com/upload/users/files/zoduzitiwoxupamo.pdfIn PDF document text
    • http://vers-ma.de/userfiles/file/gipezaroxakonosojowu.pdfIn PDF document text
    • http://omgmediatank.com/userfiles/files/79878174359.pdfIn PDF document text
    • https://assignmentmart.com/ckfinder/userfiles/files/zobolemuzakimibi.pdfIn PDF document text
    • https://apsco.ly/userfiles/files/pugokazodejipadeje.pdfIn PDF document text
    • https://wodepcb.cn/uploadfiles/files/wajet.pdfIn PDF document text
    • http://www.integra-cr.cz/administrace/ckfinder/userfiles/files/92661216201.pdfIn PDF document text
    • https://elpollopaulino.com/cenavarra_userfiles/files/pamiji.pdfIn PDF document text
    • https://corianderedmonton.com/ckfinder/userfiles/files/ridizirumejusekulufuzusu.pdfIn PDF document text
    • http://gustosandvic.com/ckfinder/userfiles/files/bepewugijabunevezow.pdfIn PDF document text
    • http://omni-links.com/images/blog/file/86822669068.pdfIn PDF document text
    • http://paramountswimwear.com/userfiles/files/bujubere.pdfIn PDF document text
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/7f13822d94b10fe7e1ed25f41a4a881e/vunoriporoxejaluteluse.pdfIn PDF document text
    • https://flexi-cms.com/uploads/file/795627100.pdfIn PDF document text
    • https://777mto.com/contents/files/25607795162.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=semantic+ui+dropdown+searchPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ba87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA87 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d29e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD29E 10996 bytes
SHA-256: 71628590ba73ec069895a773bcd42890cca2cb8cacf1b79fbc23397ff61bc60a
font_02_sfnt_off0000ec00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC00 16080 bytes
SHA-256: fa6a3fbc6fc705677fc1a0d48516d60c0fea260b907bf03931d31013aaed0ee0