Malicious PDF — malware analysis report

Static analysis result for SHA-256 a622839576fb47f1…

MALICIOUS

PDF

75.2 KB Created: 2021-09-26 22:20:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 363b1971524e0c4e2a3e8082b65a9fd5 SHA-1: 095b9baf23104950205ec1eaa06917c3b07268f4 SHA-256: a622839576fb47f1b095a86b59066898f96d595a2a0a350bf309519061f6b386
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with one heuristic identifying it as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document delivery mechanisms.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 https://balmbeach.hometeamcorp.com/images/usr/sonulus.pdf In PDF document text
    • http://aostavet.it/userfiles/files/22888641138.pdfIn PDF document text
    • http://robertoantoniz.com/resources/original/file/fugodemine.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/161476bb1befcc---3607730844.pdfIn PDF document text
    • http://bpsstudio.hu/uploads/1613309885.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613dd89633b7d---movebibidoned.pdfIn PDF document text
    • https://tuoitre.bacgiang.gov.vn/lib/ckfinder/files/bixol.pdfIn PDF document text
    • http://digitalqwerty.com/ckfinder/userfiles/files/bixitikege.pdfIn PDF document text
    • http://belstroyiz.ru/img/file/53410046033.pdfIn PDF document text
    • http://swotaweb.com/img/upload/file/28796819135.pdfIn PDF document text
    • http://elskenecologie.nl/files/51932019607.pdfIn PDF document text
    • http://buren-kompanie.de/userfiles/files/59658983840.pdfIn PDF document text
    • http://xn--b1akwe.xn--p1ai/userfiles/file/54648471279.pdfIn PDF document text
    • http://interiorconsignments.com/media/file/sevilusizumulivumoriposi.pdfIn PDF document text
    • https://vargyasnekonyveles.hu/kepek/other/file/ginepixezeg.pdfIn PDF document text
    • https://ustunbilgisayar.com/userfiles/files/30605267968.pdfIn PDF document text
    • http://ck-buhgalter.ru/userfiles/file/lozodunebidufapu.pdfIn PDF document text
    • https://pomacanthe-art.fr/imagebeforeafter/files/wazorobumufo.pdfIn PDF document text
    • http://formpart.com/upload/ckfinder/files/wuxumojitozatotikofala.pdfIn PDF document text
    • http://arci-mp.fr/admin/File/59945107446.pdfIn PDF document text
    • https://dehaventransportation.com/home/de/public_html/ckfinder/userfiles/files/wuboropip.pdfIn PDF document text
    • https://ms02bet.net/contents/files/83351279058.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=pokemon+sword+for+android+without+verificationPDF 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_off0000bb0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB0A 11040 bytes
SHA-256: 4e8bf35d5fe8a406cb9e40573cfef59a6fbcba0329900f8f0919352fa646de16
font_01_sfnt_off0000d4ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4AE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ecc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECC0 19448 bytes
SHA-256: 079b4419305b7eb0ad0235bd107043251f30ac12b1c46b1cd89c58f60b8cdb68

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