Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a382cf30d34628e…

MALICIOUS

PDF

82.5 KB Created: 2021-09-14 13:20:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: cd911110808512adf1959c8b1294438d SHA-1: 90e513a81579eff40a50838b1fe346b5c523e561 SHA-256: 6a382cf30d34628e72c238c75ab5cba333398b56fbeeb24a64ee9edbdc346ec1
134 Risk Score

Malware Insights

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

The sample is a PDF file detected as malicious by ClamAV and an ML classifier. It contains embedded JavaScript and a large number of external links, many of which point to disposable domains and appear to be part of a link farm. The presence of embedded JavaScript suggests an attempt to execute code within the user's browser or PDF reader, likely to download additional malware or redirect to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://pasarangroup1.com/contents/files/55602344507.pdf In PDF document text
    • https://binarbaid.com/public_html/userfiles/file/69240627399.pdfIn PDF document text
    • https://tramtron.vn/uploads/files/files/61634470300.pdfIn PDF document text
    • https://enilubricantvn.hoakhanh.vn/uploads/image/files/96002638907.pdfIn PDF document text
    • https://arabadvertise.com/userfiles/files/refaliwotujuzufi.pdfIn PDF document text
    • https://hometutorsdelhi.com/userfiles/files/40491967577.pdfIn PDF document text
    • https://perfecthospitals.org/ckfinder/userfiles/files/20542810525.pdfIn PDF document text
    • http://all-vehicle.net/js/upload/files/32903007563.pdfIn PDF document text
    • http://dfanchem.com/upload/files/xagikukuduxedu.pdfIn PDF document text
    • http://nsdadventist.org/FCKData/file/49809719902.pdfIn PDF document text
    • https://reha.bg/content/upload/file/zifizapedazepasuxor.pdfIn PDF document text
    • http://mexvp.com/ckfinder/userfiles/files/jerotumivovopotigedatis.pdfIn PDF document text
    • http://hagelkonzept.de/userfiles/file/14591247368.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161358244b5b75---84847678640.pdfIn PDF document text
    • http://singer-island-condos.com/userfiles/files/57716028168.pdfIn PDF document text
    • https://laurallo.com/ckfinder/userfiles/files/bewijimupe.pdfIn PDF document text
    • http://tomekorea.com/userData/board/file/xidejenusefinunuvav.pdfIn PDF document text
    • http://donghozibistore.com/luutru/files/81847856449.pdfIn PDF document text
    • http://emons-verlag.net/testarea/cwsCMSlight/media/files/gekejidogixanotolejole.pdfIn PDF document text
    • https://xn--z4qq44i.tw/upload/actfiles/ponowakijoju.pdfIn PDF document text
    • https://pasarant0g3l-turbo-h1t.com/contents/files/bejebozujiboju.pdfIn PDF document text
    • http://www.galiantsolutions.com/emailimages/file/norupowi.pdfIn PDF document text
    • http://tajesink.com/Uploadfiles/files/91575315226.pdfIn PDF document text
    • http://obraz-tlt.ru/userfiles/file/59521521139.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=watch+50+shades+of+grey+online+free+putlockerPDF 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_off0000da72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA72 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f289.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF289 11452 bytes
SHA-256: e259aafd3e894972e2b4c838c4a4dd91c96e795f174288f4a555c2d235a8d6df
font_02_sfnt_off00010d70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D70 17952 bytes
SHA-256: e67a1024590338ef8e722b2b5f582a5e7e99ab75287aa836833df4f11994f20d