Malicious PDF — malware analysis report

Static analysis result for SHA-256 c380b7d89cabd827…

MALICIOUS

PDF

83.6 KB Created: 2021-09-23 02:12:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 84f059edd0ae556c33986b657f14b15d SHA-1: 246d6b68f2c50ae9584eabd2cf12a53481361a97 SHA-256: c380b7d89cabd827ad28980a6e45aab691c100a95a248860393cd861f821201e
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are part of a link farm hosted on disposable domains, a common tactic for distributing malicious content. The ML classifier strongly indicated maliciousness, and the presence of external URIs suggests an attempt to redirect the user to potentially harmful sites. While no scripts were explicitly extracted, the PDF structure and URL patterns are indicative of a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://laborke.ru/uplcv?utm_term=oxygenos+oneplus+7+pro
    • http://vizcsap.hu/files/file/96034868393.pdf
    • http://guanzhuli.com/userfiles/file/siguvovigexufurutuxululeb.pdf
    • https://publicbridge.pl/userfiles/file/17642776198.pdf
    • https://hoanghaie.com/Images_upload/files/turerubadewonenezo.pdf
    • https://www.marjojaspers.nl/ckfinder/userfiles/files/78476899412.pdf
    • https://kisikana.hr/userfiles/file/tajutalatolinofobiwiwuf.pdf
    • http://xn--djr00fsyfv0o5qgy9u.net/filespath/files/20210919084539.pdf
    • http://ellenia3.eu/userfiles/files/vifatosikitanojibixule.pdf
    • http://accronline.com/userfiles/file/64547084545.pdf
    • http://wo-kop.pl/userfiles/file/gerezewexalekex.pdf
    • http://onlinetradeshow.ir/uploads/files/seruladunaxode.pdf
    • http://hvezda-pardubice.cz/files/file/wanonefivu.pdf
    • http://makassitools.com/userfiles/file///fopibe.pdf
    • http://nhatrangpalacehotel.com/app/webroot/upload/files/rigitabanijagapumitatobug.pdf
    • https://lrsinc.co/userfiles/file/vivujisarifej.pdf
    • http://innotack.com/userfiles/file/38023491605.pdf
    • http://cuacuongiare.vn/upload/files/64550714451.pdf
    • https://budapestpainter.hu/ckfinder/userfiles/files/jezetujo.pdf
    • http://tagsu.com/attachments/fckattachments/file/39193126924.pdf
    • http://skinct.com/upload_file/file/Fl202109222132444056.pdf
    • http://jinyezi.cn/upload/zozineduril.pdf
    • http://trungtamsangloc.vn/uploads/ck_upload/files/rubidelefukitow.pdf
    • http://zekidilektekstil.com/images_upload/files/36433988384.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_off0000e184.bin
c05a77122af0c52627e51dbc214a72a200fe25c3ac7663751865094ae894c8c8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE184 10464 bytes
font_01_sfnt_off0000f985.bin
c2a58342a1ddee77949001e76308806213a35b36969bd4b8a2ecf142c3207c27		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF985 18088 bytes
font_02_sfnt_off00012873.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12873 16792 bytes

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