Malicious PDF — malware analysis report

Static analysis result for SHA-256 3db8fb633c87a48c…

MALICIOUS

PDF

82.6 KB Created: 2021-09-09 22:53:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b4747480c914ab6d2a23fb6d07f52202 SHA-1: f9a3e94e76acefd30585f2548e003be983d464d5 SHA-256: 3db8fb633c87a48cdb11f284805c5a39b0d86306cc02b9968d302135eebdc4ae
66 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with a high-confidence heuristic identifying it as a link farm on disposable hosting. While no scripts were extracted, the presence of many external links suggests an attempt to redirect users to potentially malicious websites. The ML classifier also flagged the PDF as malicious, supporting this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

Heuristics 4

  • 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://yunnanyingxiang.com/ckfinder/userfiles/files/tupofonerajokajejuw.pdf In PDF document text
    • https://wittnebel.dk/file/3564576801.pdfIn PDF document text
    • http://rbc-bezorgdiensten.nl/upload/mitojazonosofajod.pdfIn PDF document text
    • https://camphacement.vn/upload/files/61082601564.pdfIn PDF document text
    • http://www.morrisjones.co.uk/EditorImages/file/16444582963.pdfIn PDF document text
    • http://av-jet.ru/userfiles/file/subomefitobebufisaxipe.pdfIn PDF document text
    • https://laatuwhuisweerstralen.nl/upload/file/8419022375.pdfIn PDF document text
    • https://kaxtongroup.com/home5/maxconne/public_html/kaxtongroup/assets/images/newspostimages/files/37932528108.pdfIn PDF document text
    • http://kfnmdg.com/upfolder/e/files/20210903114917.pdfIn PDF document text
    • http://pkynfe.net/userfiles/file/74972316744.pdfIn PDF document text
    • https://umiyawoodworks.com/fckdb/userfiles/file/sosim.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/161334a117df1e---meragipasamox.pdfIn PDF document text
    • http://rotang.net/userfiles/file/4440655595.pdfIn PDF document text
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/f50d0649d5ccc196d21a4c6e45913aab/javafitivusiruvopo.pdfIn PDF document text
    • http://teknis.it/userfiles/files/xevutete.pdfIn PDF document text
    • http://lmleadmanagement.com/userfiles/files/pirizagevizofenodonujava.pdfIn PDF document text
    • http://cloudinfo01.smartevolve.com/images/ckeditor/files/meribusako.pdfIn PDF document text
    • http://abcgsgeds.friendship-match.com/upload/files/11290408872.pdfIn PDF document text
    • http://koreaseals.com/ckfinder/userfiles/files/98634480902.pdfIn PDF document text
    • https://prospr.fr/ckfinder/userfiles/files/26152009260.pdfIn PDF document text
    • http://issaproject.com/app/views/panel/ckfinder/userfiles/files/98351793356.pdfIn PDF document text
    • http://thaicockstar.com/ckfinder/userfiles/files/37408885379.pdfIn PDF document text
    • http://katyababash.com/images/uploads/file/tadujujofarajexalazu.pdfIn PDF document text
    • http://noithatnhapkhaugiasi.com/luutru/files/96673723476.pdfIn PDF document text
    • http://citysoupsbellevue.com/uploads/files/87060313073.pdfIn PDF document text
    • https://abriganature.centralcms.cloud/galeria/files/31504028656.pdfIn PDF document text
    • http://aloisiquadri.it/userfiles/files/38743156188.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=how+to+check+android+battery+healthPDF 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_off0000ddb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDB4 18036 bytes
SHA-256: ebce8d149e5b4c9e108fd50c762c3154b2652c3594d224c761d2e63c56869223
font_01_sfnt_off00010c17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C17 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001242e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1242E 10724 bytes
SHA-256: df492fc0cc6e1c32319225d2bacee7707a65e4358784c1e98802026af67168cc