Malicious PDF — malware analysis report

Static analysis result for SHA-256 6856dbe9bc5af357…

MALICIOUS

PDF

78.4 KB Created: 2021-09-13 22:04:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 88f4d046c406fd595c4d57fb7c838c76 SHA-1: fc08129b2279e27a75fc5153b64143cc55348c28 SHA-256: 6856dbe9bc5af357af994cb6dd6de9ad02c268e30af503ef921352ea9dac67c5
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, with the PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicating a link farm on disposable hosting. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://maryalo.com/userData/board/file/25640349520.pdf In PDF document text
    • http://bandbaajabarat.com/ci/userfiles/files/20067738264.pdfIn PDF document text
    • https://resulgame.com/calisma2/files/uploads/944852095.pdfIn PDF document text
    • https://pearproperties.in/userfiles/file/3463857562.pdfIn PDF document text
    • http://vietnam-intraco.com/webroot/img/files/3973500473.pdfIn PDF document text
    • http://ixtvs.de/_upload_bilder/_filemanager/file/tumoxufonokejel.pdfIn PDF document text
    • http://tongkhomica.com/upload/files/guzut.pdfIn PDF document text
    • http://teifsepahan.com/files/file/xenadixibibonaminogoxi.pdfIn PDF document text
    • http://dichvuhieuchuan.com/upload/files/30744785600.pdfIn PDF document text
    • http://fanghsin.com/uploads/files/202109121954226839.pdfIn PDF document text
    • http://ammk.sk/userfiles/file/84530345289.pdfIn PDF document text
    • http://food-cloud.com/home/food-cloud/www/site/site/data/files/sugubulolekevura.pdfIn PDF document text
    • http://gsxr.hu/userfiles/file/96105341237.pdfIn PDF document text
    • http://ulsantour.com/FileData/ckfinder/files/20210913_9F96DD905DCC849D.pdfIn PDF document text
    • http://photo-ostrov.com/ckfinder/userfiles/files/pepasuxaxizepiz.pdfIn PDF document text
    • http://xn--12cm8caae5d9a0a0a1dxk6dd.com/user_img/files/tusofofuravutijuzepiforad.pdfIn PDF document text
    • http://melodylavernebettencourt.com/media/file/72554427302.pdfIn PDF document text
    • https://gestcargo.com/uploadfiles/file/muvixefino.pdfIn PDF document text
    • http://andreuma.madteam.net/ckfinder/userfiles/files/67393436768.pdfIn PDF document text
    • http://depcip.com/app/views/panel/ckfinder/userfiles/files/52188060189.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ea5a5a55ed---70681256661.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=mini+militia+doodle+army+2+for+pcPDF 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_off0000ce85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE85 17032 bytes
SHA-256: c7f4dc20cbf94c3196e59444f7d5efa0d81ede55c618bbb4446f9cb227cd7ccd
font_01_sfnt_off0000facd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFACD 10840 bytes
SHA-256: 56d1ed361b4bc132fbe7394683e29f40640cd13d15026a990b4490ab0f44e2a9
font_02_sfnt_off000113d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113D6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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