Malicious PDF — malware analysis report

Static analysis result for SHA-256 dcdd1c882461a2d7…

MALICIOUS

PDF

68.1 KB Created: 2021-10-01 02:26:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: ee3f9e6cf52689cba86c61de3f7893a9 SHA-1: 4b18f7122ef5af6e14b5436f70b28d31278cd839 SHA-256: dcdd1c882461a2d7a583f5f2dc4c6da1f16f4d4a5e6d508c174273ec1a451526
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm, as indicated by the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the nature of the embedded links and the overall structure point towards an attempt to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/9gcnfe8a0s3c18horg65112su6/55560397076.pdf In PDF document text
    • http://dubilex.com/userfiles/files/19199745084.pdfIn PDF document text
    • http://infinity-c-t.com/userfiles/file/24723418625.pdfIn PDF document text
    • http://sensitiva.fi/UserFiles/File/16813419073.pdfIn PDF document text
    • http://kazuma.ru/ckfinder/userfiles/files/93994843262.pdfIn PDF document text
    • http://gdlejia.com/uploadfile/files/20210921_113343.pdfIn PDF document text
    • http://zhihepvb.com/upload/ckimg/files/202109250459307144.pdfIn PDF document text
    • http://scarpatti.com/files/kefek.pdfIn PDF document text
    • https://anmimar.com/royal/userfiles/file/17015036716.pdfIn PDF document text
    • http://www.slenderclub.cz/ckfinder/userfiles/files/58445236151.pdfIn PDF document text
    • http://tdvvietnam.vn/webroot/img/files/xujugodemuxixirix.pdfIn PDF document text
    • http://kovospm.cz/fotky/file/pezoka.pdfIn PDF document text
    • http://www.binghan.my/userfiles/file/79051385167.pdfIn PDF document text
    • https://actorconseil.com/files/file/pofevizarupus.pdfIn PDF document text
    • http://technimexvn.com/images/ckeditor/files/92599538124.pdfIn PDF document text
    • http://eternoohydro.com/d/files/fojagikuf.pdfIn PDF document text
    • https://easresidence.ro/app/webroot/files/userfiles/files/tobokumegujif.pdfIn PDF document text
    • http://sensitiva.fi/UserFiles/File/pozemajetunavuvu.pdfIn PDF document text
    • https://www.autopsrus.com/ckfinder/userfiles/files/memumigeke.pdfIn PDF document text
    • https://mahanakhon.pacedev.com/ckupload/files/bagawetepuriba.pdfIn PDF document text
    • https://dogathermalhotel.com/resimler/files/nufodiravometizedokagaxo.pdfIn PDF document text
    • http://taispacedesign.com/upload/files/laburojuvujaguzabeveg.pdfIn PDF document text
    • https://tuinvandecruys.be/file/17904004369.pdfIn PDF document text
    • http://trevorhannant.com/81525492323.pdfIn PDF document text
    • http://jualumnitoronto.com/editor/uploadfiles/dolepuvuxag.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=world+war+z+apk+free+downloadPDF 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_off0000af19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF19 10364 bytes
SHA-256: d84fc38892182e849df9b0296784f40353e5b0199bf2bf36c557b064788f5993
font_01_sfnt_off0000c6ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6AC 14492 bytes
SHA-256: 3ceaeb9ec34c13f113b699948f72e383e2bb441cf979be979ff9491f8e68f096
font_02_sfnt_off0000ead4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAD4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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