Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba16861e626976ac…

MALICIOUS

PDF

80.4 KB Created: 2021-06-07 19:23:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 5a23ef1dfa5f67117617d0adb01a9027 SHA-1: 9967a6b88495811bf8ebd7df927a35be9696646f SHA-256: ba16861e626976ac466974e5b520b773a7bba4086967aafd07f410b336193643
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://allytemp.ru/pbw?utm_term=master+organic+chemistry+study+guides PDF link annotation
    • https://dirogine.weebly.com/uploads/1/3/0/7/130775503/c691ad.pdfIn PDF document text
    • https://lobevebuwavija.weebly.com/uploads/1/3/4/3/134394718/6970347.pdfIn PDF document text
    • https://pozugawejebi.weebly.com/uploads/1/3/4/6/134610366/7cd4f6890.pdfIn PDF document text
    • https://fedubipogumuwu.weebly.com/uploads/1/3/1/3/131379546/e3b29b44a.pdfIn PDF document text
    • https://kimidevi.weebly.com/uploads/1/3/4/0/134018720/pepibono.pdfIn PDF document text
    • https://lukejofavum.weebly.com/uploads/1/3/4/4/134455809/a996d4ba2376b16.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413850/normal_5ff608aba20fc.pdfIn PDF document text
    • https://nimivumunekal.weebly.com/uploads/1/3/3/9/133999229/6728543.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413843/normal_6008ee285499a.pdfIn PDF document text
    • https://zagesugob.weebly.com/uploads/1/3/4/3/134379314/7917273.pdfIn PDF document text
    • https://zojufagilazit.weebly.com/uploads/1/3/0/9/130969654/67a54a.pdfIn PDF document text
    • https://wawawafux.weebly.com/uploads/1/3/4/8/134896626/6379565.pdfIn PDF document text
    • https://gusinunizu.weebly.com/uploads/1/3/4/3/134380178/8564900.pdfIn PDF document text
    • https://xegiduburap.weebly.com/uploads/1/3/5/2/135294675/0993d8d8a9fc70.pdfIn PDF document text
    • https://vebudizegegogog.weebly.com/uploads/1/3/1/3/131398423/2ff8d60d93c.pdfIn PDF document text
    • https://dofufegudi.weebly.com/uploads/1/3/1/3/131381881/xilugegeraseda_vibatamafivu_zebifawobiwole_jadabaximike.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
    • http://giribuv.pbworks.com/w/file/fetch/144541605/artcam_pro_2011_tutorial.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/93cf0a8f-1fba-43d1-b439-db6b44f41004/formato_para_auditoria_5s.pdfIn PDF document text
    • http://jozeluwofe.pbworks.com/w/file/fetch/144418794/47384843693.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f1bff844-4039-4ad7-8d28-864bad4212c9/us_army_special_forces_cqb_training.pdfIn PDF document text
    • http://marutipug.pbworks.com/w/file/fetch/144421368/bleach_brave_souls_hack_android.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e0d756e2-f77a-421f-afb5-f9ea31b3dc4b/power_wise_28115g04_control_board.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_off0000efd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFD1 5312 bytes
SHA-256: e19dc825618f3ab63408cbef80b5547e18aed1989cb3aab7db53a2ca5fe87ec0
font_01_sfnt_off000101af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101AF 10748 bytes
SHA-256: cc060d9506179dd16ddc167a0a2fe67ab7584a00edfe5cb4d567f33dcb5ac14a
font_02_sfnt_off0001263c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1263C 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3