Malicious PDF — malware analysis report

Static analysis result for SHA-256 3be48f1f833d8440…

MALICIOUS

PDF

83.0 KB Created: 2021-04-15 08:52:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 5193fb48e9961f93a70bd28771dfc9b7 SHA-1: 9824d58c3e085be1870f62097bc1537a15dcb39e SHA-256: 3be48f1f833d84400bf89b5ed92870367de8233a5b205e2ec041110fe4d11122
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://midufefew.ru/strik?utm_term=zojirushi+bread+maker+virtuoso+plus+vs+supreme PDF link annotation
    • https://jixivegeparimes.weebly.com/uploads/1/3/4/7/134749144/sitizasagal.pdfIn PDF document text
    • https://lilufegat.weebly.com/uploads/1/3/5/9/135965666/e25e62dd39f714.pdfIn PDF document text
    • https://wixinuwexe.weebly.com/uploads/1/3/0/7/130739185/riwedageko_najemozivikud_lamopamumiga_giwivujifef.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383916/normal_5ff53f2ab209f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446273/normal_606c96df7ee67.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382414/normal_602ca639754b2.pdfIn PDF document text
    • https://kagoxikefo.weebly.com/uploads/1/3/4/6/134649289/zugogufobo_vepumaze_mujeb.pdfIn PDF document text
    • https://guxedujigizos.weebly.com/uploads/1/3/4/7/134735137/d7747fca.pdfIn PDF document text
    • https://zepinimokibe.weebly.com/uploads/1/3/4/3/134373719/leforesoxika.pdfIn PDF document text
    • https://jokiwaxe.weebly.com/uploads/1/3/2/7/132740814/1c16b.pdfIn PDF document text
    • https://nokajadum.weebly.com/uploads/1/3/4/8/134887388/b3a27.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451027/normal_600b4d2d91b54.pdfIn PDF document text
    • https://femovoba.weebly.com/uploads/1/3/0/7/130775826/8ddb44d5e6133b.pdfIn PDF document text
    • https://vunepixas.weebly.com/uploads/1/3/1/4/131483778/dinojop-zuvonenan.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421342/normal_604f8ffe881fe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462065/normal_602f20560ab83.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409798/normal_5ff5b5266313e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://d4508431-0eee-4913-ac2a-2ec907ed9b18.filesusr.com/ugd/12daa7_4879335a276b40de840d99cf0c0a281a.pdf?index=trueIn PDF document text
    • https://dca540c6-954d-4243-9f09-0921753db957.filesusr.com/ugd/974a4e_89d038e1f8e641cd83ada6c8e45f173e.pdf?index=trueIn PDF document text
    • https://c4a5d104-04f9-44e6-b03f-1f5edac3680f.filesusr.com/ugd/f23921_2f1634e74c784612a0039ad37d393f64.pdf?index=trueIn PDF document text
    • https://59b17237-83b3-47c6-9d40-f547da5b0434.filesusr.com/ugd/827194_e2774f870666478eab278bdaad3e6cdf.pdf?index=trueIn PDF document text
    • https://c07b3cb0-7d4a-4e65-9c62-eb3bd0ce3b6b.filesusr.com/ugd/7560d5_985d81cc7ac34d6396ca00fac070598d.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fe05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE05 5496 bytes
SHA-256: dea99893b4653c2cae6c11c5bcd04f82fc4d9e6b6e32f4547e3236dd385ecec3
font_01_sfnt_off00011086.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11086 1800 bytes
SHA-256: a36eee06fef6ce219692c4ec918276ac99413e4fd1e3666e4031624f9289d620
font_02_sfnt_off00011913.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11913 10364 bytes
SHA-256: 320c02ab1f7ec0a9ca2b69ea1265dbadccc4f31df6d4427f510890e3929d8fb8