Malicious PDF — malware analysis report

Static analysis result for SHA-256 c49b3fde6970122e…

MALICIOUS

PDF

159.8 KB Created: 2021-04-04 20:57:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: a67d54589cb0f68dcce27ef3e546d012 SHA-1: 35a209882891c2ffdd4edbb1856b0ac31426db0b SHA-256: c49b3fde6970122ed5d84803af934da9872a1a6f015beeea945deae7e01b5e33
126 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, with heuristics indicating it's a link farm on disposable hosting. The embedded URLs, such as https://jottigo.ru/award?keyword=concepto+de+metabolismo+catabolismo+y+anabolismo+pdf, suggest a phishing or malware distribution attempt. Although no scripts were explicitly extracted, the PDF structure and numerous external links point towards an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 5

  • 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 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://jottigo.ru/award?keyword=concepto+de+metabolismo+catabolismo+y+anabolismo+pdf PDF link annotation
    • http://gayerkan.com/vasilisa_the_beautiful_artrbqj4.pdfIn PDF document text
    • http://canonsburglake.org/transitive_and_intransitive_verbs_worksheets_with_answers7ueit.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409997/normal_605820eaa87a4.pdfIn PDF document text
    • http://realwockyc.info/zojizebutemld8d8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459055/normal_605465b531d41.pdfIn PDF document text
    • http://igbusinessabouthelp.com/23673840186sl25r.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448545/normal_605d9a0a6b60b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459479/normal_5fdc036f4a515.pdfIn PDF document text
    • http://submonster.xyz/78579146695s3e51.pdfIn PDF document text
    • http://fitnesspack.net/wijofemoruzutitijml28l.pdfIn PDF document text
    • http://ideaita.fun/helly_hansen_size_guide_womens1qtgp.pdfIn PDF document text
    • http://tokio-2020.fun/wosomop93f81.pdfIn PDF document text
    • http://sanatoriy-izumrudny.ru/bavunokipijemazopigetsu4p.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://rakejobik.epizy.com/xemebarof.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2bd0f830-c8f3-47b5-a94b-bbf8dcece7d7/what_to_eat_shredded_bbq_chicken_with.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3e41df6c-30d8-4de0-841e-b662b6534fbb/doxewuripin.pdfIn PDF document text
    • https://ef2e072a-e8a2-4438-804d-cc750be2e2f6.filesusr.com/ugd/6a22cb_7b679089a5794cda9f4c0530b72836f6.pdf?index=trueIn PDF document text
    • https://3175e58c-9db9-4d87-bcb9-15e03531d93d.filesusr.com/ugd/c93210_1049dd20c7f04b778f67c84dfd673cb4.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/2df5686d-d9b3-483e-ab27-292af1fc6f2d/53655942381.pdfIn PDF document text
    • http://zemagarekerak.epizy.com/bowers_wilkins_px_manual.pdfIn PDF document text
    • https://bcbc83ff-a82b-4234-bf1d-c69e8cae54d5.filesusr.com/ugd/057c82_3adc8f82793241669eb5065d9cd8a19d.pdf?index=trueIn PDF document text
    • https://f6e2a16f-d004-42cd-8f17-0463e090774c.filesusr.com/ugd/c70c35_a5d8f3f99aca4707b1f91bdc8ff243dd.pdf?index=trueIn PDF document text
    • https://af431a04-9ebc-4ea4-a98d-45e4ffbfad14.filesusr.com/ugd/485053_3cd0872a5cb34103b5f5e32ffdf8b48d.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00022c5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x22C5A 5352 bytes
SHA-256: db1bec0a4dbb13e0073fce254eda676617250f82ed65ac22ed29e50ba2c6a555
font_01_sfnt_off00023e80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x23E80 16388 bytes
SHA-256: 2c19c1b98d0a14dd5af926ba25dc8beb40e2804e5a18239f897b01eee6ac4b06

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