Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca05c3732b0180a6…

MALICIOUS

PDF

68.7 KB Created: 2021-09-25 03:45:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 07a1e18cb8331be4715c78668d15ffa7 SHA-1: dc3cffde5edeaa7e57f7ddbbc83dc191dcecc7c4 SHA-256: ca05c3732b0180a622638a4cca00b5f50b3951ecabf35f5fbea502d3799d1345
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF is identified as an image-only document designed as a lure, typical for phishing campaigns. It contains numerous links to potentially disposable hosting, suggesting an attempt to distribute further malicious content or redirect users to phishing sites. The ClamAV detection and ML classifier strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 68 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://theloneranger.tv/clients/loneranger/ckfinder/userfiles/files/pevidukatuzununep.pdf In PDF document text
    • http://www.gpkoaee.ru/ckfinder/userfiles/files/47966289227.pdfIn PDF document text
    • http://telegid.tv/userfiles/file/ludude.pdfIn PDF document text
    • https://almudenafernandez.co/ckfinder/userfiles/Files/sijeduzelujevevowolokor.pdfIn PDF document text
    • https://valerart.com/ckfinder/userfiles/files/69978287864.pdfIn PDF document text
    • http://drzwiukryte.pl/userfiles/file/nutogugikufelunoporezame.pdfIn PDF document text
    • http://tech-sub.com/userfiles/file/negupas.pdfIn PDF document text
    • https://seikai.jp/free_images/files/fegoximejuwesuvemosadoroz.pdfIn PDF document text
    • https://cordovajewelry.com/images/file/tofewagisivuwizupovib.pdfIn PDF document text
    • https://promobryansk.ru/userfiles/files/59403034581.pdfIn PDF document text
    • http://zeguvietnam.com/uploads/ckfinder/files/miwumiv.pdfIn PDF document text
    • https://panelshock.com/userfiles/file/48371831825.pdfIn PDF document text
    • http://zerosquareonline.com/file/renurom.pdfIn PDF document text
    • https://mcdelandes.ca/uploads/file/81897257916.pdfIn PDF document text
    • https://goacetours.com/ckfinder/userfiles/files/86666984638.pdfIn PDF document text
    • https://indiansabroad.uk/userfiles/file/89648434673.pdfIn PDF document text
    • http://eng.sut.ac.th/tce/2016/administrator/ckfinder/userfiles/files/99429392110.pdfIn PDF document text
    • https://agape4u.org/userfiles/file/xexire.pdfIn PDF document text
    • http://progetec.org/userfiles/files/zobimo.pdfIn PDF document text
    • http://xn--bqrr0jw6bmw2g.com/userfiles/file/1632405285.pdfIn PDF document text
    • http://www.lovebliss.tw/UserFiles/files/tepezawubuxokogolake.pdfIn PDF document text
    • http://icltindia.in/userfiles/file/93132065784.pdfIn PDF document text
    • http://azbuka-d.ru/ckfinder/userfiles/files/24674276426.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161387d526a2d4---92196700427.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142506d83157---bosanabet.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=how+to+reset+the+android+phonePDF 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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b16b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB16B 10520 bytes
SHA-256: bdd61a6964a0b1da36162a4ff54941f1e9d7a3930c8e397cf10c017a51d50296
font_01_sfnt_off0000c958.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC958 14240 bytes
SHA-256: ebd08925391a43446f4a99d590f05cf82f5993394d72f79f69246941b82e75f1
font_02_sfnt_off0000ecf1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECF1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1