Malicious PDF — malware analysis report

Static analysis result for SHA-256 f46ed35ae71d3694…

MALICIOUS

PDF

86.8 KB Created: 2021-03-27 23:52:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: ff7185a6f419a286d01d22212859f17b SHA-1: b9fa1c52f165e70be6e9ef30e9b10452179816ef SHA-256: f46ed35ae71d3694f26eee2487713f038c6a25ad42e139aa3d68873fb7046683
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable domains, indicating a link farm. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or SEO manipulation. While no scripts were explicitly extracted, the PDF structure and heuristic firings point to the use of embedded JavaScript for link redirection or obfuscation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://baarspo.ru/award?keyword=year+4+maths+arithmetic+test+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4390366/normal_60014cd5d76c9.pdfIn PDF document text
    • https://virataxutepubom.weebly.com/uploads/1/3/0/8/130874282/sotifejitij-gufijo-kakunume-gikibusowelat.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4365586/normal_5fcacac4dcb6c.pdfIn PDF document text
    • https://kavekoda.weebly.com/uploads/1/3/5/3/135326791/2553845.pdfIn PDF document text
    • https://kezamipi.weebly.com/uploads/1/3/0/8/130873984/9219920.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368497/normal_5fd2256b74928.pdfIn PDF document text
    • https://ruzutemeba.weebly.com/uploads/1/3/2/6/132681300/zanepetes_jisuno.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420760/normal_5fdc54b3cfcc4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444875/normal_60282f6fc901a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/lopadivupudexa/systemverilog_virtual_interface_array.pdfIn PDF document text
    • https://6776ac3f-883f-499f-bc52-38dff818ec46.filesusr.com/ugd/969751_47a0664d88114a0cb39ee8ccde8ab4f6.pdf?index=trueIn PDF document text
    • https://cd29ef07-728f-4a0b-b57b-23e770395c36.filesusr.com/ugd/f14cf6_fb3f5b0c86ca4393a0b1a2d1a62f87d9.pdf?index=trueIn PDF document text
    • https://65d0a56f-4074-4e8f-9acc-29e6f8e8f663.filesusr.com/ugd/37655d_cd3daea5ba124f3c9789caf468f89b10.pdf?index=trueIn PDF document text
    • https://ec08fec6-e576-400d-8504-372613838d3c.filesusr.com/ugd/57e0ce_c70384b67bdd4549b231793d624efaeb.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/votawawo/vibigovezugewigagulususa.pdfIn PDF document text
    • https://1c92f6d8-19eb-429c-9239-1cf6be91372f.filesusr.com/ugd/cc1a03_99b2c6f4088f49eaa605d09bffe9d830.pdf?index=trueIn PDF document text
    • http://pajupevezujugut.atwebpages.com/data_analysis_in_spss_with_examples.pdfIn PDF document text
    • https://00407fa8-a9ef-4b78-9bbe-46147fc8acf6.filesusr.com/ugd/5ecadc_971540a486e44d019e522d8ac7cedc55.pdf?index=trueIn PDF document text
    • http://bivojeda.atwebpages.com/44285285378.pdfIn PDF document text
    • https://43a98339-0465-49d0-a416-8cef4780896f.filesusr.com/ugd/89258f_c134779050bd457d929a7032cbcbcd4f.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000100a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100A6 5412 bytes
SHA-256: 9bd246958feeccc6abdf8432bfb08a2944a1760a9f55c5c330c2fd78f2e71eb8
font_01_sfnt_off000112eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112EB 11068 bytes
SHA-256: 69c8e819084a5b1a076365ff25c8fde17042722c379facc55307655f56fa3dbd
font_02_sfnt_off000138d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138D2 16060 bytes
SHA-256: d1a84ba8f0e4a827a048d387db8dd5dae3538f1c7e72415b16af587a9947cdc7