Malicious PDF — malware analysis report

Static analysis result for SHA-256 d670c78099afec4d…

MALICIOUS

PDF

76.3 KB Created: 2021-03-29 14:47:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: f7b35e8bb38d9cb00de4e1fd9c4fd93b SHA-1: 9c47694ae6ade88532b56a7cadecb30845e6f979 SHA-256: d670c78099afec4d73fc38ff7facf7f1d7e015c1ceb5a13e12ef84228e5da7da
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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://nipisod.ru/wix?keyword=google+calendar+school+schedule PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4500429/normal_5fdb6112064b8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4477635/normal_5fccc13feb01b.pdfIn PDF document text
    • http://sokegex.mywebcommunity.org/metro_map_paris_download.pdfIn PDF document text
    • http://lejifip.sportsontheweb.net/konosuba_light_novel_download_epub.pdfIn PDF document text
    • http://bafiselavanebep.mywebcommunity.org/what_are_8_limbs_of_yoga.pdfIn PDF document text
    • https://mubazujozij.weebly.com/uploads/1/3/4/7/134705676/0718a76.pdfIn PDF document text
    • https://sekikeke.weebly.com/uploads/1/3/4/7/134739811/7317016.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459645/normal_5fcb3f21479f9.pdfIn PDF document text
    • http://xubajur.mygamesonline.org/biometry_course.pdfIn PDF document text
    • https://boxijapemisavar.weebly.com/uploads/1/3/0/8/130874030/20d925.pdfIn PDF document text
    • https://nasewinadomev.weebly.com/uploads/1/3/4/5/134521200/57866a3df.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://3d6da986-5be3-4955-9d5c-e891e6c56a45.filesusr.com/ugd/3c671a_0eece767c539467faed3dcafa4cf6f96.pdf?index=trueIn PDF document text
    • https://8cff94d3-ecab-4ea5-ad27-d3e67d02fd32.filesusr.com/ugd/2813e2_778d7baa5db44c368194b1fa15d5b321.pdf?index=trueIn PDF document text
    • http://pisonepegosa.myartsonline.com/391890336.pdfIn PDF document text
    • https://ddf64d59-5240-4154-9987-17dfc28e22c7.filesusr.com/ugd/cec570_8d19645c10ba49658bf2148627f87f5e.pdf?index=trueIn PDF document text
    • http://tojuzogip.myartsonline.com/fobupudofujozokelakozepux.pdfIn PDF document text
    • https://80172413-d145-4b71-b7cf-4a007d76ad29.filesusr.com/ugd/cacfd7_099ca859188e44b1bf450d13358b8539.pdf?index=trueIn PDF document text
    • http://semowomeso.onlinewebshop.net/how_to_disassemble_a_whirlpool_oven.pdfIn PDF document text
    • http://tediguku.atwebpages.com/aldehyde_ketone_and_carboxylic_acid_questions.pdfIn PDF document text
    • https://37976aa0-f55f-47d3-847a-8d185b13ebf6.filesusr.com/ugd/1d6212_4d990db60b0c4d6e9c52f8f186bc9473.pdf?index=trueIn PDF document text
    • https://21036261-01f9-4725-a342-2b8b08d10099.filesusr.com/ugd/d0cbc4_0e145365e3f846b98a4c0c1d9751d10e.pdf?index=trueIn PDF document text
    • https://c1f973cf-d719-4acb-8f9e-cd83ae4fb94d.filesusr.com/ugd/057766_eb44dfe6555a479f91ffe391242db1f9.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_off0000edeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDEB 5232 bytes
SHA-256: c56fa7ac1ebe666e62433ead338fa8549eff900a6f6b3984b05e6d21e1cc13c0
font_01_sfnt_off0000ffb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFB2 10424 bytes
SHA-256: f31cec4c3e63dc929ab80422f134d5ec3295a770d9ea53dc6d1733596566397b