Malicious PDF — malware analysis report

Static analysis result for SHA-256 38fcec152b014c3d…

MALICIOUS

PDF

79.6 KB Created: 2021-09-11 15:04:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e34c808077dbef744f355b4338523cd4 SHA-1: 6858eb95a5a95fa38b7dfbfa9acede29e25b029a SHA-256: 38fcec152b014c3dd4401fdaaa929d12d8529e7a201a160af5706444c44f6340
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for exploiting PDF vulnerabilities or redirecting users to malicious sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a large number of external links, suggesting a phishing or content-farming operation. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 http://businessdevelopmentcenter.pl/uploads/userfiles/files/4443860199.pdf In PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c477688edb---mudikodupabumimupeno.pdfIn PDF document text
    • http://aorganboys.handyfriendship.com/upload/files/fokubikinegapipadidol.pdfIn PDF document text
    • http://scard.vn/app/webroot/uploads/files/45814896847.pdfIn PDF document text
    • https://nmg.lv/img/uploads/files/zefenubobirej.pdfIn PDF document text
    • http://vektorma.ru/uploads/assets/file/jelez.pdfIn PDF document text
    • http://ulsantour.com/FileData/ckfinder/files/20210909_2DD50E6DC67823D4.pdfIn PDF document text
    • https://alistairmills.com/ckfinder/userfiles/files/47855105194.pdfIn PDF document text
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/1369d789501379a0526a0eb7378406ab/vatama.pdfIn PDF document text
    • https://eirai.org/editor/ckfinder/userfiles/files/77415907966.pdfIn PDF document text
    • http://pradakshinam.com/fck_uploads/file/39252193309.pdfIn PDF document text
    • http://longvu.vn/Images_upload/files/xofisozomosijug.pdfIn PDF document text
    • http://como.gattinonimondodivacanze.it/themes/userfiles/files/kolog.pdfIn PDF document text
    • http://tsuiteru66.com/userfiles/file/xozopemudejusamosomiguw.pdfIn PDF document text
    • http://nissanotogovap.vn/uploads/images/files/gubagigax.pdfIn PDF document text
    • https://otoform.com/upload/ckfinder/files/nazeti.pdfIn PDF document text
    • https://ikuseikyokai.jp/ckmedia/files/72846599131.pdfIn PDF document text
    • http://www.jysunshine-hotel.com/up_files/file/37889264763.pdfIn PDF document text
    • http://abwlanham.com/uploads/files/lulizakemotaribokuzad.pdfIn PDF document text
    • http://lica.plovdivweek.com/js/ckfinder/userfiles/files/zamubif.pdfIn PDF document text
    • http://mijn-nederland.nl/userfiles/file/12937925805.pdfIn PDF document text
    • https://branchennachweis.eu/userfiles/file/xewumojelezubutumabije.pdfIn PDF document text
    • http://kocavietnam.com/upload/files/deromoruxilolu.pdfIn PDF document text
    • https://mldom.xyz/web/img/podborky/files/dixutosokamet.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=lt+g12+giant+heart+labeledPDF 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_off0000d053.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD053 10508 bytes
SHA-256: e55f834634824ae3a847d1e008a7bcf458dd995968ed976fdb75e4895b0f7ff8
font_01_sfnt_off0000e7fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7FC 18408 bytes
SHA-256: d189ef08a040ebd389707190a3fc67a199b9c2c4ffa627eabf9b6700846e3bf6
font_02_sfnt_off000117c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117C9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1