Malicious PDF — malware analysis report

Static analysis result for SHA-256 adb33cbb0535300d…

MALICIOUS

PDF

142.1 KB Created: 2021-02-27 01:02:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: 161219b907709f8ebfca9727c761a12d SHA-1: 509ee876b58a5ff12042354bd69d9720defb974a SHA-256: adb33cbb0535300d02b6dfebd06b4070ba78db2658dda31c7d9fdc728a7f7931
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, and is flagged by ML classifiers and ClamAV as malicious phishing content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a strategy to distribute links across many low-reputation domains. While no scripts were explicitly extracted, the nature of the PDF and its embedded links strongly suggests it's designed to redirect users to malicious sites for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 5

  • 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.
  • 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://zajinet.ru/wix?keyword=test+of+genius+math+worksheet+answers+c-78 PDF link annotation
    • http://mosebuzixat.mywebcommunity.org/17092999286.pdfIn PDF document text
    • https://cdn.sqhk.co/fejisedetu/Pgc4Ojg/advance_auto_parts_houston.pdfIn PDF document text
    • http://kozidozilujivox.getenjoyment.net/singer_sewing_machine_customer_care_number.pdfIn PDF document text
    • http://rafupofamurawaf.mygamesonline.org/vinubapiwojimosarapuji.pdfIn PDF document text
    • https://cdn.sqhk.co/bebomopakax/jib5jjb/godukivavizusugivebisonid.pdfIn PDF document text
    • https://nutarubanamu.weebly.com/uploads/1/3/4/5/134528768/gafuvom.pdfIn PDF document text
    • https://lobovalosidim.weebly.com/uploads/1/3/1/4/131437181/kilomirixegisaresu.pdfIn PDF document text
    • http://mitutepoka.medianewsonline.com/definicin_de_marxista_de_modo_de_produccin_capitalista.pdfIn PDF document text
    • http://zonerokemub.getenjoyment.net/how_to_get_a_vet_assistant_certificate.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450506/normal_5fee65815b1a3.pdfIn PDF document text
    • http://kurixuj.sportsontheweb.net/ntuser.dat_windows_7.pdfIn PDF document text
    • http://widopomulagu.22web.org/how_many_btus_does_a_22kw_generator_use.pdfIn PDF document text
    • http://wumewil.sportsontheweb.net/35912482739.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xodenumaverap.epizy.com/21426825018.pdfIn PDF document text
    • http://jawikaginixuxuz.rf.gd/3838555222.pdfIn PDF document text
    • 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://scripts.sil.org/OFLIn 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_off0001cf3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CF3A 5672 bytes
SHA-256: 7c93da04d2e64a8f4ed0916ed768ea46301923160a657a1126dfe43be41c5dfd
font_01_sfnt_off0001e27b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E27B 16020 bytes
SHA-256: 48a489b91fbe63b7a700263467ba663dd7d2f441c1af4ec72a4d44a480400397
font_02_sfnt_off00021494.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x21494 16344 bytes
SHA-256: 43c26abaad7a669a27ef13a89ce1ebe72cd6f32188ca694eb889e69fd9f3b786

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