Malicious PDF — malware analysis report

Static analysis result for SHA-256 efdb7a0235ba9b85…

MALICIOUS

PDF

91.8 KB Created: 2021-03-17 10:38:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 6a06153cb098745b680b14c39072dac4 SHA-1: 1883fd2c0a1e5f7f289d2272d4e003cacfff622c SHA-256: efdb7a0235ba9b852f084d2d50c3ac16613c68b79d207061dba306422fafeefc
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 0.9999

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://gimoguvi.ru/wix?keyword=protist+lab+worksheet+answers PDF link annotation
    • http://kemytbok.xyz/apa_manual_8th_editionvh2bh.pdfIn PDF document text
    • http://vizojuzoninunoz.scienceontheweb.net/concierto_de_aranjuez_gratis.pdfIn PDF document text
    • https://zolefixu.weebly.com/uploads/1/3/4/4/134432518/4943803.pdfIn PDF document text
    • http://olimpcargo.ru/traffic_and_how_to_avoid_it2fk1w.pdfIn PDF document text
    • https://fisomekoxow.weebly.com/uploads/1/3/5/3/135326807/jamuviwipi.pdfIn PDF document text
    • https://cdn.sqhk.co/puzadowoke/ihoIicd/punch_out_bingo_cards_near_me.pdfIn PDF document text
    • https://cdn.sqhk.co/kabevapixox/gejgjiN/59153330340.pdfIn PDF document text
    • http://silekutum.medianewsonline.com/pdf_bestanden_samenvoegen_adobe_acrobat.pdfIn PDF document text
    • http://persequenteamsohbet.com/xidosunegulowudisepi5t74j.pdfIn PDF document text
    • https://lemusovigezamo.weebly.com/uploads/1/3/1/3/131381045/puwazebasosuv-porobovofomi-sasezeji-xorefanapu.pdfIn PDF document text
    • http://gudokav.sportsontheweb.net/wunatu.pdfIn PDF document text
    • https://gemenudotipetal.weebly.com/uploads/1/3/2/6/132695720/zopatumeba.pdfIn PDF document text
    • https://vosojexurixug.weebly.com/uploads/1/3/1/0/131070535/rulikewibejir_gimeg_tijisedabojos.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://d0a6b1b1-1773-4622-8b5e-0ab5990a7ed3.filesusr.com/ugd/b90ba1_a4942e1d2dab465c991c85ffb15a0242.pdf?index=trueIn PDF document text
    • https://f72e0e13-a873-49c5-9cb5-3c2848b8c5b2.filesusr.com/ugd/f8ba4b_8a0adb0e95da405eb1a66e138f6e9815.pdf?index=trueIn PDF document text
    • https://c809e8a6-5bdf-489d-8d8c-df4e4638a115.filesusr.com/ugd/45a296_c9c53894327e4ad986b6b29c471b8aa8.pdf?index=trueIn PDF document text
    • https://e05653fc-386e-4c8b-889d-738aee72c63e.filesusr.com/ugd/62421a_42a82c5861d94de5837acdaed308abf2.pdf?index=trueIn PDF document text
    • https://2178e3ec-2e0a-46e0-af35-d8a6fdfeb21a.filesusr.com/ugd/c411cf_215aa4e7868a4aae8938f826618a881f.pdf?index=trueIn 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012b01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B01 5072 bytes
SHA-256: f594e8f380b71afefe5daa7ce62ef04b8d378b9c351ee61956ad5c53fcff2496
font_01_sfnt_off00013c4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C4A 11016 bytes
SHA-256: 51f707e416415e2945533875c1d15f58edca14376f4ee59841ad80a3912165d9

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