Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d206a1972a4b549…

MALICIOUS

PDF

83.0 KB Created: 2021-09-16 10:58:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 36540a97d6cc39a54d5683e7e319316b SHA-1: d726353d9c75fd9b4474c15a89f45292497c60ad SHA-256: 5d206a1972a4b549105a597d38736350c0fedac66829361bd1cac7999f21d0dc
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The document contains numerous embedded URLs, many of which point to disposable domains and function as a link farm, a common tactic for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and the nature of the URLs suggest an intent 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 http://tnmetalworks.com/images/files/40137928168.pdf In PDF document text
    • http://vet-arrighicolangelicristilli.eu/userfiles/files/mojekisusilubipamen.pdfIn PDF document text
    • http://everestlodgelukla.com/userfiles/file/1146888267.pdfIn PDF document text
    • http://mjacz.cz/soubory/files/19394266530.pdfIn PDF document text
    • https://pesonabali.dswip.com/ci/userfiles/files/80540417462.pdfIn PDF document text
    • http://szkolaprzybranowo.pl/ckfinder/userfiles/files/kexelowog.pdfIn PDF document text
    • https://attackworkoutprogram.com/app/webroot/files/ckfinder/userfiles/files/zoxonivevilarumafoligav.pdfIn PDF document text
    • http://c2r-auto.com/uploadfiles/file/2021091606571473499.pdfIn PDF document text
    • https://ice-group.pl/userfiles/file/rixaf.pdfIn PDF document text
    • https://zweefvlieg.net/userfiles/file/61195063195.pdfIn PDF document text
    • http://garderoba.sk/images/_file/10823073144.pdfIn PDF document text
    • https://www.educazionesessuale-scuola.ch/ck/ckfinder/userfiles/files/tafikivurixa.pdfIn PDF document text
    • https://www.q-jin.ne.jp/ckfinder/userfiles/files/sipururosodukiwaji.pdfIn PDF document text
    • http://abwferrellpkwy.com/uploads/files/31249205071.pdfIn PDF document text
    • http://fthyhs.com/resource/docContentImg/file/2021-09-08/02a853f731f4eee282c5ed9c03aa4df6.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d781b8dc52---buribusimon.pdfIn PDF document text
    • http://vlajamo.cz/images/file/26952091742.pdfIn PDF document text
    • http://janjoling.com/public/ckfinder/userfiles/files/vawidamojiserugezokopibo.pdfIn PDF document text
    • http://myconnect-thailand.com/image/upload/File/15591363198.pdfIn PDF document text
    • http://szigmetal.hu/editor_up/43206785567.pdfIn PDF document text
    • http://sloplast.com/userfiles/files/86222387128.pdfIn PDF document text
    • https://durgabas.coop.np/ckfinder/userfiles/files/77604287963.pdfIn PDF document text
    • http://shangrilayunnan.com/ckfinder/userfiles/files/71770073762.pdfIn PDF document text
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/507d2ca8db39c69a08628bd61d1db1fe/67870713339.pdfIn PDF document text
    • https://fcr-fomentoconsumoerenda.com/uploads/files/64983890625.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=call+recorder+with+hide+iconPDF 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_off0000e33e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE33E 10416 bytes
SHA-256: c0246f691c81dc57374200cc6e343676f9d10eba5710b7e03b83d661f1eb70b7
font_01_sfnt_off0000face.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFACE 16736 bytes
SHA-256: 61055d00532fb09e2e8264f5aecf2dacc923ba6e5373abb2866922c7f02a2535
font_02_sfnt_off000125e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125E5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1