Malicious PDF — malware analysis report

Static analysis result for SHA-256 28a5c0685fac0374…

MALICIOUS

PDF

76.4 KB Created: 2021-04-15 09:09:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: c6214520c55bd2c33d4934da184fa548 SHA-1: 39268201804030d5fcae7c8bfe6b6c8d89fe9cb1 SHA-256: 28a5c0685fac03745382f3601cc8979cd68b80e548eb8422460c7e1858884349
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with one specifically identified as a lure related to a movie search term. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic indicates a high volume of links pointing to disposable hosting, suggesting an attempt to obscure the true malicious destination. ClamAV detection and ML classification strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://leonvi.ru/strik?utm_term=sophie+kinsella+can+you+keep+a+secret+movie PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4371495/normal_601306892c3ee.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494681/normal_600a3e16e4b1c.pdfIn PDF document text
    • http://finansi-7.online/politics_in_states_and_communities_15th_edition_chapter_1mpvfs.pdfIn PDF document text
    • http://smartcoin.design/danunepafemipokoratolulaogru9.pdfIn PDF document text
    • http://dihtyar.online/south_african_house_music_2018_free23g6c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384655/normal_5ff76f1827f35.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4475577/normal_5fee8aaae1ced.pdfIn PDF document text
    • http://cabinetsop.xyz/best_annotation_software_windowsf001d.pdfIn PDF document text
    • http://maddot.space/real_estate_license_exams_for_dummies_audiobookbei2p.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4390371/normal_5fddd97636164.pdfIn PDF document text
    • http://arevakar-travel.com/kapefejiralivajext79ch.pdfIn PDF document text
    • http://ladyso.ru/chuunibyou_light_novel_englishcdj4g.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://masofokikixij.rf.gd/gugamopobogu.pdfIn PDF document text
    • http://valopuloti.rf.gd/sherlock_holmes_novels_sinhala_free.pdfIn PDF document text
    • http://folujas.epizy.com/kufajadisetakoduvaza.pdfIn PDF document text
    • https://d3df31c7-72fe-42b1-a92e-0723e8ed7a16.filesusr.com/ugd/5bf82b_89ad62d3d7134b248d0f06480b481917.pdf?index=trueIn PDF document text
    • https://33da92c3-26de-4f6b-bf12-1693cb6a6e79.filesusr.com/ugd/0307f2_bcdc047ab6f04f5d91f34092ff01a4f6.pdf?index=trueIn PDF document text
    • https://3633ae4e-9acc-45df-885e-1bfa1481cb44.filesusr.com/ugd/e73054_340006d3c1934b9e8aca898ea936648c.pdf?index=trueIn PDF document text
    • http://winulinimax.rf.gd/jetokokuxivowuved.pdfIn PDF document text
    • https://5366dd3f-28a3-4342-b8e5-5bed86455aec.filesusr.com/ugd/a92322_6a5d2d80c37643de845230a2c795a709.pdf?index=trueIn PDF document text
    • http://nedukej.rf.gd/sesavedan.pdfIn PDF document text
    • http://diwomikutaz.epizy.com/zeboberuweres.pdfIn PDF document text
    • https://a54de82d-0003-4787-801b-d7ee719c780a.filesusr.com/ugd/8d57bd_aa8dfc2065c74d228ac833d57f4bb70d.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_off0000eac6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAC6 5500 bytes
SHA-256: dd875eb49953ece996f326055ba9cd362947a16f584bda7ea0356ceb960aad75
font_01_sfnt_off0000fd5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD5C 11272 bytes
SHA-256: 4ef30ad34c542ab5822141aad60cf7a25133a5ea20c3abf9dd969bdc45ffca57

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