Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b442d4c6ff04cd1…

MALICIOUS

PDF

84.9 KB Created: 2021-05-24 13:22:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 32e851c29165d51ab219ecda676a39c1 SHA-1: 733b9320765c44408c4ff416107ff3ab0e885068 SHA-256: 0b442d4c6ff04cd1905a8e237a54fe258da81ef9169734799af9ae733b6fb41f
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users. The embedded URL 'https://leonvi.ru/strik?utm_term=game+offline+hay+2020+pc' indicates a lure related to game downloads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware.

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://leonvi.ru/strik?utm_term=game+offline+hay+2020+pc PDF link annotation
    • https://palegovod.weebly.com/uploads/1/3/1/0/131070329/mepamazanefuze.pdfIn PDF document text
    • https://lafitezin.weebly.com/uploads/1/3/5/3/135323108/9778707.pdfIn PDF document text
    • https://mojoranazo.weebly.com/uploads/1/3/4/4/134403481/weberebazenutamu.pdfIn PDF document text
    • https://motubisirewu.weebly.com/uploads/1/3/4/5/134529252/c5cefe15b2bc51.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469126/normal_6037fc24eb61f.pdfIn PDF document text
    • https://vakogiguwowokel.weebly.com/uploads/1/3/0/7/130775334/9263409.pdfIn PDF document text
    • https://navowilupaxit.weebly.com/uploads/1/3/1/3/131381067/woxoku_wigik_segalu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414357/normal_5fe52f279148e.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/04afb577-571d-40c3-a51b-11b114d3c0d1/4934448515.pdfIn PDF document text
    • https://s3.amazonaws.com/pevuwarobuvowa/xujowefofadip.pdfIn PDF document text
    • https://s3.amazonaws.com/mubemutolewe/texas_drivers_ed_workbook_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/55240a52-67df-41f4-86aa-9a0cacad0cb5/whats_the_best_battery_powered_hedge_trimmer.pdfIn PDF document text
    • https://s3.amazonaws.com/rupatojuko/tadoluwimatis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b65a0be9-a6ec-4a2c-b3b9-ad01c5803b13/xorodelulodevenuda.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/04a10395-162f-4c19-bbcf-fdf4298df02c/80477870714.pdfIn PDF document text
    • https://s3.amazonaws.com/jotogorurekuro/duplicate_marksheet_pune_university.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/44d04589-a4bc-4ef7-b40b-8657b6b11a8c/lukimak.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dbded39b-d19c-4bf8-a78e-69148697ccb0/kinaturokexosetoxulo.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_off0000f8fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8FA 5388 bytes
SHA-256: f8faff95c5684e781de775484b9c241175547c2c7422f444697ccbea99adc5f3
font_01_sfnt_off00010b32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B32 1800 bytes
SHA-256: a36eee06fef6ce219692c4ec918276ac99413e4fd1e3666e4031624f9289d620
font_02_sfnt_off000113bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113BF 22252 bytes
SHA-256: 280c0592a4ab46dcf6aa6fae4ef1a9f4e001f62333841af767358dd766c6bc96