Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd16c00a2e991984…

MALICIOUS

PDF

80.9 KB Created: 2021-09-23 20:10:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: f9529fff42fe7c0167ebdf296d6ca25a SHA-1: 97608188b50882bd2c2c8d33d66fec1355d54a80 SHA-256: dd16c00a2e991984a6ccfc316e0ce08e99d44d212e8d1d7d24effd974235640c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or malware distribution attempt. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is designed to host a large number of links on disposable domains, likely to redirect users to malicious sites. While no scripts were explicitly extracted, the presence of numerous embedded URLs points to a phishing or redirection attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://cructi.ru/uplcv?utm_term=best+way+to+watch+baseball PDF link annotation
    • http://kerekesvillszer.hu/UserFiles/file/45282888275.pdfIn PDF document text
    • http://wadsoda.com/UserFiles/File/40383661781.pdfIn PDF document text
    • http://ekbdrive.ru/ckfinder/userfiles/files/27426796822.pdfIn PDF document text
    • http://wannawwannie.pl/userfiles/file/rinalibuvizanuvupu.pdfIn PDF document text
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/6b53abfcb251e140b2bb86ef41881a8c/27245672576.pdfIn PDF document text
    • https://linhquan-group.com/upload/ck/files/75095901039.pdfIn PDF document text
    • https://faresaldabbous.com/uploads/files/kodudewunikefufonin.pdfIn PDF document text
    • http://kadh.kr/bobod/upload/file/kivavetepufejeji.pdfIn PDF document text
    • https://cqhuaan.myhost360.cn/upload/files/09-11-13-08-18-67.pdfIn PDF document text
    • http://keralatravelpath.com/uploads/file/9530307576.pdfIn PDF document text
    • http://arqing.es/ckfinder/userfiles/files/kajodewipifolatedolenelim.pdfIn PDF document text
    • http://friulanamarmi.it/images/file/memis.pdfIn PDF document text
    • http://ytovietnam.net/ckfinder/userfiles/files/90628964738.pdfIn PDF document text
    • https://www.sibirprokat.ru/ckfinder/userfiles/files/vanupukefexare.pdfIn PDF document text
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/70e0720faeeef7fb4aa02f19583947ec/vulonozawijiju.pdfIn PDF document text
    • http://edituj.cz/res/file/57857625415.pdfIn PDF document text
    • http://aerotechgroup.ru/img/outer/files/vosukavab.pdfIn PDF document text
    • http://www.iuoelocal870.com/kaizen/ckfinder/userfiles/files/50207698097.pdfIn PDF document text
    • https://alcc.c-zentrix.com/ALCC/mail_attachments/multitenant-ws-01/1/1631311267.pdfIn PDF document text
    • https://ivanda-commerce.hr/userfiles/file/jajovuda.pdfIn PDF document text
    • http://trunghungplastic.com/luutru/files/sidomixukarolodoso.pdfIn PDF document text
    • https://babetravelling.com/ckfinder/userfiles2/files/14477541134.pdfIn PDF document text
    • http://auto-spec.ca/fck/file/digijof.pdfIn PDF document text
    • https://pragatitic.org/ckfinder/userfiles/files/nixibomofepezusolowin.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_off0000d614.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD614 10424 bytes
SHA-256: 47a205d45792895374c2c80af748a32986a8c7c3fae3fa6effce45b1216f1ffa
font_01_sfnt_off0000ee01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE01 18288 bytes
SHA-256: c9d88161623dd4318ad458edecadd2ccc137cf004f7f149b1e44cf1fd8afad11
font_02_sfnt_off00011de5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DE5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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