Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ba880430d76af28…

MALICIOUS

PDF

78.3 KB Created: 2021-05-15 07:44:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: a86bd937d8df3a11188073137a9c94d3 SHA-1: c513cbf3e3a25612bd4a74140593217de084fa03 SHA-256: 1ba880430d76af28ee9dedb0b6d29e43ffa70143b63b312e2c30eda547d038e5
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm designed to direct users to potentially harmful websites. The primary malicious URL identified is https://midufefew.ru/strik, which is likely used for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://midufefew.ru/strik?utm_term=fisher+and+paykel+fridge+vegetable+drawer+removal PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4425515/normal_60450d4393ec7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380395/normal_6069ee5b6260f.pdfIn PDF document text
    • http://lnstagramverifiedbadge-form.com/cisco_3750_x_manualh3d84.pdfIn PDF document text
    • http://trylait.pro/vamelewebolerocaokh.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393022/normal_60168c2985ed8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390637/normal_603275bc76c8a.pdfIn PDF document text
    • http://erogan24.website/domalikojuxutolekiwgpzkh.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481662/normal_604e925313a83.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://9cf93ecd-64ee-4ad6-afcc-f350577a7522.filesusr.com/ugd/c4dbd3_627fc304716742c5b5866d15c1d89383.pdf?index=trueIn PDF document text
    • https://9fbeb193-358d-48fe-b9d9-45f8b63f6b3c.filesusr.com/ugd/ab67b9_4be77c678ceb46c299fc5ec855cc679e.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jinabom/94348636070.pdfIn PDF document text
    • https://40e214c1-1950-44e8-a195-e2c6eeb23253.filesusr.com/ugd/a517f4_9429131bb2794dca9d6e0157a0fd5561.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zaxawetawupo/los_cazadores_de_sombras_pelicula_completa_en_espaol_latino.pdfIn PDF document text
    • https://0dc5016f-38c0-4e11-84f4-4717e3ef4ec7.filesusr.com/ugd/4fd84c_112814ede9f6445987745fd3e20b4234.pdf?index=trueIn PDF document text
    • https://5e3b32e6-a537-4a58-a531-ef303a468713.filesusr.com/ugd/120874_91dc1b37887244b7ab487d3281b15ee9.pdf?index=trueIn PDF document text
    • https://368051e9-4199-40ea-b9a2-dc6e6f83cb3b.filesusr.com/ugd/6260fe_f382f3daa6bd4b1bbe0d6f47cad1a1ef.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/lawakux/79078566537.pdfIn PDF document text
    • https://7f993087-45f6-41f4-96e5-9dcaca18fb91.filesusr.com/ugd/9a92dd_120acc6d87434aa08a534ab1cb4d373e.pdf?index=trueIn PDF document text
    • https://10bc5e17-7652-4c7e-9b43-999b3eb3b021.filesusr.com/ugd/5edc69_ef90bb86ee174c67a86f1a9c0ee6ea0f.pdf?index=trueIn PDF document text
    • https://f1cb2ec4-a82d-4768-8a06-5236a2db220e.filesusr.com/ugd/a2e20a_08bb3337409b415497bb982403121768.pdf?index=trueIn PDF document text
    • https://3e021c9a-284a-4c54-9ba1-f6d43d4d2ba5.filesusr.com/ugd/a619af_6c2cf1d991bf41d5aa6aa82624846a57.pdf?index=trueIn PDF document text
    • https://b24182fa-1fee-416c-9f57-41d8a36573e1.filesusr.com/ugd/1cc367_ef0ada64e05c4fb6ada840a6da4b8de7.pdf?index=trueIn PDF document text
    • https://16e729f2-8c5c-4787-b670-14aeba6c5e03.filesusr.com/ugd/ac55e2_3213bff046a043fe85ee3544e01aa883.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wopari/how_to_make_navigation_bar_transparent_android.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_off0000f267.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF267 5868 bytes
SHA-256: dfa94881ff04320c903ad16ee86c3bcd5472afd254c8ee30ec6e5d6016bb2e8d
font_01_sfnt_off0001065b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1065B 10936 bytes
SHA-256: 840cd10174a5af1485d71af2438da2d9aab1de474156f34831a8d6a15700c569