Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6d6b1a2917c1995…

MALICIOUS

PDF

79.1 KB Created: 2021-09-23 06:32:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 5a497cb09688bb02b0796a1e342b3f58 SHA-1: 8a89af35141f2484ce1390aa581344880431e907 SHA-256: d6d6b1a2917c1995bd57342c5a746ddcfd2f4b92e89ea3b8bda1cfd7db217a7c
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple heuristics indicating it is a link farm designed to redirect users to malicious content, with one URL explicitly containing 'download game' and another pointing to a PDF file. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://catamma.ru/uplcv?utm_term=download+game+megapolis+city+building+simulator+urban+strategy+mod+apk PDF link annotation
    • http://sdes.in/uploads/wepinobenadetud.pdfIn PDF document text
    • http://hawaiisushi.iorderfoods.com/uploads/files/tijekupepap.pdfIn PDF document text
    • http://kortennis.co.kr/B/ck/ckfinder/userfiles/files/nixonefujegarowegenunu.pdfIn PDF document text
    • http://benthanhsgfarm.net/images/uploads/files/ponirukixamivega.pdfIn PDF document text
    • http://www.globalnautique.nl/upload/files/40915062045.pdfIn PDF document text
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/f4eqc9k3s718s5psrs8hkj6b14/gorepanu.pdfIn PDF document text
    • http://nelly-design.ru/upload/files/marepe.pdfIn PDF document text
    • http://jadever.vn/Images_upload/files/78567416484.pdfIn PDF document text
    • http://greenflameenergy.com/userfiles/file/subiwemoroderivalufanemix.pdfIn PDF document text
    • https://digbijoynath.in/uploads/userfiles/files/tibotejopupopudosunoroxi.pdfIn PDF document text
    • http://ckud.handysociality.com/upload/files/15085967185.pdfIn PDF document text
    • http://krr-nfe.com/suratnfe/UserFiles/File/dikutapiselopalo.pdfIn PDF document text
    • http://shrlie.com/upload_fck/file/2021-9-6/20210906125849421820.pdfIn PDF document text
    • https://cbdc.co/uploads/ckfinder/userfiles/files/gubelozadajimur.pdfIn PDF document text
    • http://vo23.ru/upload/file/98996735396.pdfIn PDF document text
    • http://podlahyadvere.sk/editor_uploads/system/files/3761725326.pdfIn PDF document text
    • http://expertsystemgroup.com/file_media/file_image/file/11488997909.pdfIn PDF document text
    • http://www.hkimm.hk/_bin/ckfinder/userfiles/files/911439849.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/161356d1c91556---raradebotisero.pdfIn PDF document text
    • http://proxima-design.cz/files/file/24928009107.pdfIn PDF document text
    • https://epgeptech.hu/ckfinder/userfiles/files/20531257015.pdfIn PDF document text
    • http://poptheme.cn/uploadfile/files/20210911_221303.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_off0000ccdd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCDD 11392 bytes
SHA-256: 7ec2d33f5cac0240a8dd076d18fd5e9ab56c586c386cb344f5e9118c09f06001
font_01_sfnt_off0000e755.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE755 17928 bytes
SHA-256: 602202b47e0d4a3044d3d4fc1a72c8065388c3546a9d3dd8350837aba6a46276
font_02_sfnt_off000115f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115F3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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