Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d16271ca1eb62eb…

MALICIOUS

PDF

80.2 KB Created: 2021-05-11 18:54:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 4635b61c639b8fb241258ea8b17bf192 SHA-1: 557bbd01a3e17e30b04c76efc99289cadb497cd5 SHA-256: 4d16271ca1eb62ebbd2740c4a55f60052106e0534e206754a051ca8fb11b509b
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 0.9998

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://bologen.ru/strik?utm_term=apple+airport+time+capsule+printer+setup PDF link annotation
    • https://femovoba.weebly.com/uploads/1/3/0/7/130775826/suwogixazulum.pdfIn PDF document text
    • https://soxodoma.weebly.com/uploads/1/3/4/6/134695887/famofuse-papubavowijaxem-bagakuge-wepakevib.pdfIn PDF document text
    • http://parazepurafeza.medianewsonline.com/kujinurumivumibuv.pdfIn PDF document text
    • http://pozuvixa.getenjoyment.net/virology_carter_center.pdfIn PDF document text
    • http://vuvulusigi.scienceontheweb.net/warerodixoneg.pdfIn PDF document text
    • https://levevozupub.weebly.com/uploads/1/3/1/4/131407214/2059383.pdfIn PDF document text
    • https://durabikat.weebly.com/uploads/1/3/4/5/134512276/soninukonepubije.pdfIn PDF document text
    • https://tamaxanafe.weebly.com/uploads/1/3/1/8/131856242/afafcc4046cf.pdfIn PDF document text
    • https://kitozegukelod.weebly.com/uploads/1/3/6/0/136056839/4011182.pdfIn PDF document text
    • http://tetupamino.mywebcommunity.org/gonemesidelemaruwedefejaf.pdfIn PDF document text
    • https://pigulanofalo.weebly.com/uploads/1/3/1/4/131406379/106bea307e8f2a3.pdfIn PDF document text
    • https://dubiroki.weebly.com/uploads/1/3/1/4/131483307/689995.pdfIn PDF document text
    • https://kagunalikabogow.weebly.com/uploads/1/3/5/3/135350350/6267582.pdfIn PDF document text
    • http://letinebab.mywebcommunity.org/5_star_hotel_brochure_design.pdfIn PDF document text
    • https://pofimutazotoxo.weebly.com/uploads/1/3/4/0/134000188/260437.pdfIn PDF document text
    • https://xariwavunulopex.weebly.com/uploads/1/3/1/4/131406448/45e2b03732463f.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://6974b9b2-fc2a-4e9b-9495-84ff65489eb7.filesusr.com/ugd/395280_db4098ade524466d9c49cfbfa3dd82b2.pdf?index=trueIn PDF document text
    • https://aa700e4b-9450-4a85-8b7e-8c92ffe47626.filesusr.com/ugd/de972d_3cc4bc8fd3ff466bb424c82a70d3405a.pdf?index=trueIn PDF document text
    • https://506dbbd1-d4b3-44b1-a4c9-6b5d0cab6a23.filesusr.com/ugd/c75f60_4e4d9d76168f4c2dbdd2eee9a9a88607.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_off0000ef96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF96 4952 bytes
SHA-256: 15b1a4ca3a2ca0c28ced1813c38c34017c6ab802ee4c9744a4c76a2b950c5818
font_01_sfnt_off0001004c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1004C 10928 bytes
SHA-256: cb987fdd263e9c2163cfaa5092517b40a96cd79d0ca3cd2aca0656c60957e308
font_02_sfnt_off000125ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125AE 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3