Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b8c87bbcb0e9d01…

MALICIOUS

PDF

78.2 KB Created: 2021-04-14 09:07:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 1b114eeb648bcd88df0412f2218e1a3e SHA-1: 710f353f9fbe2e8d14410990994b55e5828826cd SHA-256: 4b8c87bbcb0e9d01d66247d31f9e4e22d284a2106e7fa80059acfb974cfa8ee4
186 Risk Score
Tags
free-cdn-ebook-manual-lure

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 0.9998

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://leonvi.ru/strik?utm_term=how+to+vector PDF link annotation
    • http://kalidejomepajo.scienceontheweb.net/femilogajezabezusow.pdfIn PDF document text
    • http://labifovejes.mypressonline.com/bajunavoxoxituvopiko.pdfIn PDF document text
    • http://lexusesadedebaz.22web.org/xaxejojitux.pdfIn PDF document text
    • http://vebuwovivulab.mygamesonline.org/duden_redensarten.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://09af0a6c-c0e6-47ff-90c1-5b173435ccd1.filesusr.com/ugd/b92b66_46779fb099444f308c1481fc76d36bc0.pdf?index=trueIn PDF document text
    • http://kivabidugitu.rf.gd/calculus_derivatives_practice.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/68b65185-9b1b-4b2d-b851-3f7e8b73c3a4/vovesobebuzugivinetor.pdfIn PDF document text
    • http://wetedezowob.rf.gd/free_download_cerita_anak.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/91851be4-6b89-4345-8c67-ab040ff45121/29120230634.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b3fab146-d2e5-4b26-b375-1e5b8ec18a77/55558541626.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a0e81c19-7873-487a-8aa0-f5566a7c7b14/where_is_the_transmission_control_module_located_on_a_2004_dodge_durango.pdfIn PDF document text
    • http://tawenaxogiminax.epizy.com/patizuvekib.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c32826cc-22f6-4d24-af8b-19b459b8a95c/49201736820.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/342bc57f-e273-4a8c-90a3-51ca2fb7f5d0/how_to_start_a_new_project_in_ms_project.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a6d91559-95c0-4fb2-9270-968558faa6dc/56330139212.pdfIn PDF document text
    • https://34ec465e-51aa-4dba-9a8c-c05fcfb5ae84.filesusr.com/ugd/df15ee_03757fbaca8244a996914c927cf851ee.pdf?index=trueIn PDF document text
    • https://c504e2ef-f928-4e80-b5b1-fc05046f432e.filesusr.com/ugd/247f25_ae0d29d8d1d441a2ba13f5e7d5820854.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_off0000ed29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED29 4120 bytes
SHA-256: baadf05c4e6ecbc33c1860ee267a57e777ec1a5025ded14f715343a82a21b451
font_01_sfnt_off0000fb3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB3C 10212 bytes
SHA-256: 1bf5be68b2ab6ab5526d8867111d0a6fc120152d2307816e89ba516154ea8faa
font_02_sfnt_off00011e1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E1B 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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