Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ca20e1e126b1844…

MALICIOUS

PDF

71.2 KB Created: 2021-05-30 06:43:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: bb214d376a4309a8e6311518bd2829fb SHA-1: 5eefece33d45d4732982f7330638d2a97b6c4c42 SHA-256: 6ca20e1e126b1844a5092eabf97915480b8cdbc4cddef9f862a7a84df4404e8d
186 Risk Score

Malware Insights

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

The PDF contains numerous external links, many hosted on disposable domains, suggesting a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://maypoin.ru/strik?utm_term=doors+of+stone+pdf PDF link annotation
    • https://juloxiwam.weebly.com/uploads/1/3/5/9/135967800/112159.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4502567/normal_602bf6fda0fdf.pdfIn PDF document text
    • https://lewofadexireg.weebly.com/uploads/1/3/4/8/134868993/2069096.pdfIn PDF document text
    • https://zivejopoji.weebly.com/uploads/1/3/4/2/134266783/e55185d0a93a.pdfIn PDF document text
    • https://loxekezipoga.weebly.com/uploads/1/3/4/6/134678149/sudadorulugaj.pdfIn PDF document text
    • https://mirigemiw.weebly.com/uploads/1/3/4/7/134753474/9965220.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4418764/normal_5fcb1aa7e22df.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379471/normal_6014e7f5cd85f.pdfIn PDF document text
    • https://wuremude.weebly.com/uploads/1/3/2/8/132815206/5b051d19e8db.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482206/normal_600c21f11cbfd.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/3b47de56-0dfb-43f7-9b33-cef3c4eaa431/brother_hl-2170w_configuration_utility.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f43bd434-429b-4aae-a8c0-0887309ade95/netowobifenufumomeg.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d4fda8e7-ab69-4cd5-b174-a6d79df57835/sopa_de_letras_para_imprimir_para_nios_de_tercer_grado.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/604be796-e1f5-4842-9076-36fddc0d9427/33974209192.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8acf1ae6-ee6c-4a0c-9c06-2b01d2d7210f/the_crown_netflix_season_4_trailer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3c236f20-19ae-49e8-a001-8b3e0a984f41/used_mack_e7_engine_for_sale.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e98cb9cc-a012-4c46-9ccd-585ce73c2878/kibizaruzivorusoped.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e6088471-a15d-4de1-be61-94676ba35b0c/what_are_three_examples_of_shared_american_values.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8a37e79f-7217-4bd2-88bf-ae29615ea613/distributed_systems_course.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000da31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA31 4792 bytes
SHA-256: 548c961f5e3517cf82acdf958f70d701fb24155be654dbfb85849ad40d7b5733
font_01_sfnt_off0000ea95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA95 11040 bytes
SHA-256: b9b25ed394a504eac9ff2ea1501b9dd99ff8e360d419df1ee4788d866754f48b