Malicious PDF — malware analysis report

Static analysis result for SHA-256 323f9494818bf8a9…

MALICIOUS

PDF

75.5 KB Created: 2021-09-11 22:02:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-27
MD5: 2cdec203aef3509c1635bf75c31b92aa SHA-1: 02ce2989814da4814fa53d6dcf414c5526d29462 SHA-256: 323f9494818bf8a99efba422b1b4595fa75de1fcb9ed9a8fcb4895d352e07b89
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which are part of a link farm designed to redirect users to potentially unwanted software downloads. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate attempt to obscure the final destination by using multiple disposable hosts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://coverline.ro/userfiles/file/55106858453.pdf In PDF document text
    • https://spbmworld.com/anaeter_capital/siteadmin/userfiles/files/gefotazafulexajawororu.pdfIn PDF document text
    • http://infinijewelry.com/userfiles/file/23979356249.pdfIn PDF document text
    • http://epoptavky.com/is/images/FCKeditor/File/padufagokuze.pdfIn PDF document text
    • http://antoniolescio.net/userfiles/files/pudajijujodawi.pdfIn PDF document text
    • http://hotelpenza58.ru/ckfinder/userfiles/files/pegotexo.pdfIn PDF document text
    • http://hermanosgolbano.com/admin/fckeditor/editor/filemanager/connectors/phpfile/77109449170.pdfIn PDF document text
    • http://marisqueandopremios.com/campannas/file/67927871912.pdfIn PDF document text
    • http://thaiboxes.com/piceditor/file/5888422771.pdfIn PDF document text
    • http://dienlanhhuubinh.com/upload/files/3415765445.pdfIn PDF document text
    • http://mnogonomerov.ru/uploads/file/37003826762.pdfIn PDF document text
    • http://baharev76.ru/userfiles/file/sutizamunovekem.pdfIn PDF document text
    • http://ourpreferred.com/userfiles/files/67148447299.pdfIn PDF document text
    • http://awarelaxcentrum.cz/user_files/file/xojafaxogara.pdfIn PDF document text
    • https://alubiasdetolosa.com/files/galeria/files/ruvipi.pdfIn PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-9-3/20210903031406841675.pdfIn PDF document text
    • http://www.sintsprev-ms.org.br/ckfinder/userfiles/files/69966239566.pdfIn PDF document text
    • https://servicepapik.ro/files/berosatoxexedu.pdfIn PDF document text
    • http://pantanalmsnews.com.br/ckfinder/userfiles/files/15698110601.pdfIn PDF document text
    • http://hurtowniagrafit.pl/userfiles/file/52254081370.pdfIn PDF document text
    • http://dichvubaove.online/upload/files/bojolopeporexewilevav.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=clash+of+clans+mod+apk+new+versionPDF link annotation
    • 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c433.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC433 11064 bytes
SHA-256: f3961507d605415d6fe31875a645b561240939a4e757d7d6c26d3166fde3f69c
font_01_sfnt_off0000ddd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDD2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f5e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5E4 16776 bytes
SHA-256: 86f55747a779becde1812bc23c855a1adb42e08f37144aeb641e1656774b688b

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