Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce25cdabcc6770f7…

MALICIOUS

PDF

82.5 KB Created: 2021-09-17 12:55:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: d91ef112cdfdb82ef1e0768c155bfb80 SHA-1: 638ef32a0c9e5470415261afadb9d10986c8d5f7 SHA-256: ce25cdabcc6770f7a880e9c9f6635b6fcbc2fe1b20704ce1f6f353b4ad632c4f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous external URIs, many pointing to disposable hosting, suggesting a link farm or phishing lure. The presence of embedded URLs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic strongly suggest the document is intended to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://ngaa.org.au/application/third_party/ckfinder/userfiles/files/liwuxanokaletiwajo.pdf In PDF document text
    • https://www.weldcor.ca/public/ckfinder/userfiles/files/29856124282.pdfIn PDF document text
    • http://diegogenna.it/userfiles/files/34086176541.pdfIn PDF document text
    • http://kukdae.com/files/fckeditor/file/6156679980.pdfIn PDF document text
    • http://billagelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/fisewuluwa.pdfIn PDF document text
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/78c3db645179356a377b346d7c26bf20/62707494167.pdfIn PDF document text
    • https://fullgame.hu/uploads/files/kikevokadixelekaroza.pdfIn PDF document text
    • http://daejonggyoyc.com/userfiles/file/20210913182838.pdfIn PDF document text
    • https://kluchar.net/klucharnet/images/file/96804876420.pdfIn PDF document text
    • https://dveropolis.ru/upload_picture/66407595652.pdfIn PDF document text
    • https://uzunlarpeynir.com/dursun/upload/files/xuwakukotosatedewivili.pdfIn PDF document text
    • https://copacndg.com/images/uploads/files/saweg.pdfIn PDF document text
    • http://najlepsietorty.sk/uploads/fck/file/87324353717.pdfIn PDF document text
    • http://transcash.com/ci/userfiles/files/8453881353.pdfIn PDF document text
    • http://kooijobs.in/ckfinder/userfiles/files/73322116921.pdfIn PDF document text
    • http://caytrong.vn/Images_upload/files/sukijumov.pdfIn PDF document text
    • https://daotaolaixesontay.com/uploads/file/pavonesetararabaru.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613ca02c00037---53021643042.pdfIn PDF document text
    • http://www.oneworldkarate.com/fckeditorimages/userfiles/file/77355573155.pdfIn PDF document text
    • https://volnynaklad.cz/data/file/bakopukokevepujixe.pdfIn PDF document text
    • https://charlesstreetvideo.com/userfiles/file/telomejajenilalilegupelar.pdfIn PDF document text
    • https://remont-bez-zabot.ru/files/file/2864506108.pdfIn PDF document text
    • https://jmclimatizacionhvac.cl/images/subidas/file/poxovusizenavuw.pdfIn PDF document text
    • https://carsen.sk/editor_uploads/system/files/dapawi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=otp+sms+reader+apkPDF 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_off0000d288.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD288 22376 bytes
SHA-256: 8b8e171eebbc81d8a73e4acad9c43d7184f3c23a7ab4c0b9c155e23f62e45da0
font_01_sfnt_off00010d3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D3E 10308 bytes
SHA-256: 60a5c66f07d0ba8b29f59ccdecbf57003f92b23bdd6f3882c769212690910863
font_02_sfnt_off00012497.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12497 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1