Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a40d172920ccd12…

MALICIOUS

PDF

81.6 KB Created: 2021-03-13 17:47:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 0edf40ded2e4815ae25795be09e0d2ec SHA-1: d25572e965bbceec173a7eeb264d113afc7009c7 SHA-256: 0a40d172920ccd12d7e2bcc86256361bba0614de041b82f528bb2cb12aa2a0db
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 ClamAV as a phishing trojan. The ML classifier also strongly indicates maliciousness. The document's structure suggests it's designed to act as a link farm, directing users to potentially malicious sites under the guise of search results.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://druttle.ru/strik?utm_term=how+to+reset+casio+g+shock+ga+150 PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4382186/normal_5fde015aab412.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4456143/normal_5fe50ef7121bd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477147/normal_6027094985616.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456686/normal_602ceab5915b7.pdfIn PDF document text
    • http://eeeeeyyy.space/felugozuvapefoj0odqh.pdfIn PDF document text
    • http://resukagewa.22web.org/is_solo_parent_leave_prorated.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367273/normal_60462950e8830.pdfIn PDF document text
    • http://opencabinets.xyz/lozapofevoftk4ij.pdfIn PDF document text
    • http://topitoxituzoju.iblogger.org/katetovewibit.pdfIn PDF document text
    • http://xefijemav.iblogger.org/basecamp_garmin_mac.pdfIn PDF document text
    • http://chambreapp.xyz/formato_para_una_minuta_de_trabajotoddp.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388421/normal_60123ba4da92b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450350/normal_602aaa166e3b6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470014/normal_600728082bad3.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/e8aa1374-f812-497e-8f62-bfc6af18cd1e/chinese_character_to_pinyin_app.pdfIn PDF document text
    • http://sipomivizipe.epizy.com/install_android_app_on_windows_xp.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/98d9bcad-177b-4cc4-a95d-b4d0edd4ef21/98056201421.pdfIn PDF document text
    • http://fonaxipovun.epizy.com/57951616310.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/76c72da0-45eb-4ea1-9d8d-d7e16a0fd123/bitaradogoputabagu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/35b371f1-963c-4f73-af80-825e474bbd67/data_security_engineer_jobs.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/72e4e7cc-a954-4c9c-baeb-b3b0a5198248/gevimesadugosoferepiwuku.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f371.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF371 5148 bytes
SHA-256: 578ce843f1f3ecd01a4b657988bee177138cdeb8ca1d423a4ae1c83fb9a19eec
font_01_sfnt_off0001051d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1051D 10596 bytes
SHA-256: 2f4c576631104d1dafdf8b9604dd1a5e7b1dcb05951e933a0c1049c1c545666c
font_02_sfnt_off00012950.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12950 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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