Malicious PDF — malware analysis report

Static analysis result for SHA-256 da852ea48681fb23…

MALICIOUS

PDF

86.3 KB Created: 2021-09-20 00:50:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 7b6d29ffbce813bcc43ab618b6495f5f SHA-1: ac301b15811be0a9772bf345593a74009a7a798a SHA-256: da852ea48681fb23157c1415c4dbc40a0d44d1afbc4b8bb2afce09aa7cf80455
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains numerous embedded URLs pointing to external sites, suggesting a redirection or download mechanism. The PDF structure and embedded links are indicative of a phishing attempt or a lure to a malicious website.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 https://smidgel.ru/uplcv?utm_term=how+to+delete+photos+from+sd+card+on+phone PDF link annotation
    • http://ytovietnam.net/ckfinder/userfiles/files/93555858785.pdfIn PDF document text
    • https://faresaldabbous.com/uploads/files/83015980673.pdfIn PDF document text
    • http://asijskepotraviny.cz/files/file/2516370170.pdfIn PDF document text
    • http://vattuxaydunghl.com/userfiles/file/newixitixijagizedakinow.pdfIn PDF document text
    • http://firsttimehomebuyerstudy.com/images/file/24971171161.pdfIn PDF document text
    • http://baloneacessorios.com/_upload/file///67839818732.pdfIn PDF document text
    • https://livres-arts.com/ckfinder/userfiles/files/11889758870.pdfIn PDF document text
    • http://dsfly.com/uploads/files/17206712863.pdfIn PDF document text
    • http://powerfalcon.net/uppic/files/93236416319.pdfIn PDF document text
    • https://plasy.com/uploads/file/patozo.pdfIn PDF document text
    • http://beastyenergy.com/userfiles/file/duxurisogukiketoxijuko.pdfIn PDF document text
    • http://geombiagioschettino.eu/userfiles/files/posavev.pdfIn PDF document text
    • http://auburn-companies.com/userfiles/files/26218091467.pdfIn PDF document text
    • https://everestart.com/images/stories/file/figobagijuvik.pdfIn PDF document text
    • http://ristoranteibucanieri.it/userfiles/files/nasuluketagexawig.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613125afa9109---96532483023.pdfIn PDF document text
    • https://yumasri.com/assets/ckfinder/userfiles/files/gunisesuluweju.pdfIn PDF document text
    • http://exhibitionchannel.com/upload/65010292027.pdfIn PDF document text
    • http://daegyung.kr/userfiles/file/20210906104805.pdfIn PDF document text
    • http://weingut-suppan.at/files/notasilagaxozefevomu.pdfIn PDF document text
    • http://indigobaby.eu/upload/files/93981727731.pdfIn PDF document text
    • https://eseninternational.com/uploads/files/5001940140.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_off0000eb75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB75 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001038c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1038C 10872 bytes
SHA-256: 6ccd3aa876618ca8b129170cff7d5559aacec1fa0a3cbb6a5afb1044405473b5
font_02_sfnt_off00011c84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C84 18156 bytes
SHA-256: 01fc4c4cb7c57fd1eeb001cf1f49c4940a9cfb07ab4af3b5e1a3000e306b5d56

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