Malicious PDF — malware analysis report

Static analysis result for SHA-256 309dd9d8514473f9…

MALICIOUS

PDF

80.8 KB Created: 2021-09-08 17:46:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: a4bebd2fb6887388584bfedd88324820 SHA-1: 24e4e3727bce69bc6f71f9e51263376985d8657d SHA-256: 309dd9d8514473f9b14d4ed3e552b126ce39779d18a6181d6e1bba09116a437a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many of which point to disposable or unknown hosting, characteristic of a link farm used for phishing or malware distribution. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically flags this behavior, suggesting the document's primary purpose is to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://kultmotor.hu/images/files/vutoxos.pdf In PDF document text
    • http://pizzeria-millemiglia.de/app/webroot/img/editor/file/zidejunafitopusa.pdfIn PDF document text
    • http://cerrutistudio.eu/userfiles/files/34170707783.pdfIn PDF document text
    • http://www.thunderesp.com/ckfinder/ckfinder.htmlfiles/62844114123.pdfIn PDF document text
    • http://kimbuunguyen.com/uploads/userfiles/file/77805306754.pdfIn PDF document text
    • http://laarakkers.com/ckfinder/userfiles/files/51741278220.pdfIn PDF document text
    • https://1tlstar.com/storage/uploads/files/wevosogudaxopegasatur.pdfIn PDF document text
    • https://sushixusa.com/userfiles/files/4603328672.pdfIn PDF document text
    • http://art4you.sk/editor_uploads/system/files/fijadozidigevitipezo.pdfIn PDF document text
    • http://museodegliarazzimarsala.com/userfiles/files/gisovelatanovor.pdfIn PDF document text
    • http://tuclubcr.com/campannas/file/91784272160.pdfIn PDF document text
    • http://cayxaotamphan.net/userfiles/image/file/57832165441.pdfIn PDF document text
    • https://dnm.tw/uploads/files/202109041118113273.pdfIn PDF document text
    • http://edwindijk.nl/home/edijk/domains/edwindijk.nl/public_html/uploads/file/54904880323.pdfIn PDF document text
    • http://moretonassets.net/userfiles/rabakasunepudesupa.pdfIn PDF document text
    • https://netlandschool.cl/files/xijowilapigipo.pdfIn PDF document text
    • https://www.grdr.org/paidel/ckfinder/userfiles/files/26997100684.pdfIn PDF document text
    • http://ng-sons.com/userfiles/file/kunixipa.pdfIn PDF document text
    • http://sd-admin.fazendapenaazul.com/ckeditor/uploads/files/16418837618.pdfIn PDF document text
    • https://agermag.ro/mm/file/tipiru.pdfIn PDF document text
    • http://myblindz.com/fck_user_files/file/kefuxos.pdfIn PDF document text
    • http://exhibitionchannel.com/upload/86328292921.pdfIn PDF document text
    • https://transdeliveris.lt/userfiles/file/jefininadetezexofetu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=colitis+pseudomembranosa+por+antibioticos+pdfPDF 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_off0000d78a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD78A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ef9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF9C 17396 bytes
SHA-256: 3730a398d9198feaaef0b24f704f013373b595ff558270b149c50ae511266e35
font_02_sfnt_off00011c60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C60 11052 bytes
SHA-256: d76129847a8ed61b1ca0b774043a87e7cd0d81a1a0945eff838a454f47a78373

Open this report in the interactive analyzer, or submit your own file for analysis.