Malicious PDF — malware analysis report

Static analysis result for SHA-256 858936a2abddc13f…

MALICIOUS

PDF

83.3 KB Created: 2021-09-18 12:57:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8f749e5c586957871189ba517e2181f8 SHA-1: 5faaa027098579066330a0e309244f91e89b3d03 SHA-256: 858936a2abddc13f036496bce92f93b5c00386d3638f57cf384c3bd791269ad3
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and URL patterns suggest it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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 http://jamalcar.com/userfiles/file/47533869907.pdf
    • http://shesob.com/file/files/59966287934.pdf
    • http://capmar.eu/userfiles/file/wogure.pdf
    • http://zrdb-drogbud.pl/Upload/file/22964234149.pdf
    • http://taiwangallant.com/uploads/files/202109172354318679.pdf
    • http://oawebserver.com/piceditor/file/29807023614.pdf
    • http://moretonassets.net/userfiles/guzuwekujimukidetejuzoviw.pdf
    • http://muzycznescyzoryki.pl/userfiles/file/somosadazufugexepuwagowa.pdf
    • https://journalofcritique.com/ckdosyalari/upload/files/38025455615.pdf
    • http://career-id.org/ckfinder/userfiles/files/71507552040.pdf
    • http://fuhua.tumujike.com/assets/upload/files/202109032121182403.pdf
    • http://rlmlaw.com/images/edit_images/file/sisibisazofap.pdf
    • https://nstoplana.rs/ckfinder/userfiles/files/pigalelozegeledanivenuza.pdf
    • https://highendteen.com/userfiles/files/rabapakal.pdf
    • https://olamare.com/img/uploaded/file/32562918859.pdf
    • https://goodmix-psc.com/userfiles/files/rajow.pdf
    • http://alanaf.ru/userfiles/files/xubemaxe.pdf
    • http://fishngrill.iorderfoods.com/uploads/files/66449424547.pdf
    • https://inprovitcaribe.com/ckfinder/userfiles/files/87896109878.pdf
    • http://celeb.huh.hu/UserFiles/File/farajivujuvotanofepuvo.pdf
    • https://heart-calligraphy.com/uploads/files/202109120036313466.pdf
    • https://event-connections.net/wp-content/plugins/formcraft/file-upload/server/content/files/16132bcac5975d---45165179335.pdf
    • http://janaturismointegrato.com/uploads/file/62685944180.pdf
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16143cb506bde3---rerakevonudubosi.pdf
    • http://liceoadultos.juniorcollege.cl/userfiles/files/xalakokimuruzowusun.pdf
    • http://robertoantoniz.com/resources/original/file/golamazinubute.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=thor+ragnarok+watch+online+putlocker
    • 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_off0000dfbb.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDFBB 16792 bytes
font_01_sfnt_off0000f7d2.bin
4b04432cd7c29c1924bba214b2e91ba160087f061a195110b16a97e7881989bc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF7D2 10728 bytes
font_02_sfnt_off00011076.bin
dfca38482f53058271f55154e1a7887ff51eb6445c597f6da8ccf08e9b9d6ba6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11076 18108 bytes

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