Malicious PDF — malware analysis report

Static analysis result for SHA-256 5deec65f7c12d54e…

MALICIOUS

PDF

87.3 KB Created: 2021-09-19 07:51:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ad6a48837e032fdec4324bfcf4fb0572 SHA-1: b8a263213a3e1e494f6ec2daf8207ee5746184aa SHA-256: 5deec65f7c12d54e19345e447c4691495e82432ada7d1e8ebdaeb1dd0ab584ad
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various domains, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier strongly flagged this PDF as malicious, and the heuristic analysis identified it as a link farm on disposable hosting. While no scripts were directly extracted, the nature of the embedded URLs suggests an intent to facilitate further malicious activity, such as phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 4

  • 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://coretry.ru/uplcv?utm_term=how+to+access+android+files+from+pc+without+unlocking PDF link annotation
    • http://tcyy88.com/userfiles/file/2021090702525573499.pdfIn PDF document text
    • https://webkapper.nl/ckfinder/userfiles/files/pukotowomosuf.pdfIn PDF document text
    • http://cnzhongkui.com/fckeditor/editor/filemanager/connectors/php/uploads/file/101126009280.pdfIn PDF document text
    • http://timocomputer.cz/files/file/sebeman.pdfIn PDF document text
    • http://vtvxm.vn/userfiles/file/magobujasefupapogadip.pdfIn PDF document text
    • http://deaprogettazioni.it/userfiles/files/xegoximawikawu.pdfIn PDF document text
    • http://lexxyin.net/files/fckeditor/file/32687458258.pdfIn PDF document text
    • https://valerart.com/ckfinder/userfiles/files/veboxolawiwasitalifubapo.pdfIn PDF document text
    • http://zamel2.pl/userfiles/file/48340062936.pdfIn PDF document text
    • http://dagmare.de/userfiles/file/71078827465.pdfIn PDF document text
    • http://monticellotownship.org/userfiles/file/80614263058.pdfIn PDF document text
    • https://fsbulletsandbrass.com/userfiles/files/kebomapu.pdfIn PDF document text
    • http://labotinnghia.com/img/files/kelid.pdfIn PDF document text
    • http://schokoladenfontaene.de/idata/46629942629.pdfIn PDF document text
    • http://cupta.org/userfiles/files/20210919051757.pdfIn PDF document text
    • http://unternehmensberatung-hegenbarth.de/userfiles/file/94418377978.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/1612f8a7b03788---50681946437.pdfIn PDF document text
    • http://samurairamenbar.com/uploads/files/jevazomu.pdfIn PDF document text
    • http://emeraldcovepartners.com/_data/images/file/56055215744.pdfIn PDF document text
    • https://jackinthegymtpe.com/uploads/files/202109060449312262.pdfIn PDF document text
    • http://imoroz.by/upload/file/71481281724.pdfIn PDF document text
    • http://secureyun.cn/uploadfile/file///2021091706571422.pdfIn PDF document text
    • https://sheenabusesandcoaches.com/userfiles/file/gaxadikunegazop.pdfIn PDF document text
    • http://teifsepahan.com/files/file/63626967437.pdfIn PDF document text
    • http://xn--or3bi2da319p.com/upload/fckeditor/file/sefenogazidareno.pdfIn PDF document text
    • 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_off0000ebea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBEA 11336 bytes
SHA-256: caea797c4f2aab0cf4ff59281b5a45adaec227d9c726b86e8a23109bd85b04e7
font_01_sfnt_off00010632.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10632 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011e44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E44 18852 bytes
SHA-256: 0c590864ba70438756269d9f1c81326bff4bbace61bcfbcea45d1117437f9dbd