Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a7337f2ae55b810…

MALICIOUS

PDF

87.5 KB Created: 2021-05-15 21:42:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: b61027c18d2caf1628dc44e8a77ae41f SHA-1: 490cfcddfba1f6b3354b853d19a66c62cc0a12e1 SHA-256: 5a7337f2ae55b810f63a4ebbc50b55aa2bf88c2a31397f5f5ff8910dc767a12b
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or phishing operation. One prominent URL, https://mezovuduw.ru/strik?utm_term=brandon+burlsworth+crash+details, is likely part of the malicious infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://mezovuduw.ru/strik?utm_term=brandon+burlsworth+crash+details PDF link annotation
    • https://nuzunovi.weebly.com/uploads/1/3/5/3/135314570/mefajapinexase.pdfIn PDF document text
    • http://premiumpornclips.com/how_to_clean_an_air_o_swiss_humidifierfzav3.pdfIn PDF document text
    • https://wivixape.weebly.com/uploads/1/3/4/8/134897282/b40c82d195a21b.pdfIn PDF document text
    • http://swast-group.website/viva_bingo_slots_free_casinou3rq2.pdfIn PDF document text
    • https://zipadufemawosep.weebly.com/uploads/1/3/1/3/131398243/1355734.pdfIn PDF document text
    • https://tefuvaxijo.weebly.com/uploads/1/3/0/7/130739162/2631370.pdfIn PDF document text
    • http://mattelipsticks.site/73414071767utsxb.pdfIn PDF document text
    • http://meine-gebuhrenfrei.com/linux_for_beginners_and_command_line_kung_fu_jason_cannonc47bl.pdfIn PDF document text
    • https://xajadigosulibab.weebly.com/uploads/1/3/4/6/134650053/lepubij-xegodeve.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://78e27e65-9996-4239-a63d-7a21722db537.filesusr.com/ugd/03f576_4d713cd1934945578821e8217d0e54f8.pdf?index=trueIn PDF document text
    • https://a001dc82-f31e-4944-9b76-0a8e602b6855.filesusr.com/ugd/e4ee87_5848d4b0a64b47efa1f214f48b1b7563.pdf?index=trueIn PDF document text
    • https://e0fa0743-814d-41de-b6a5-47f787911882.filesusr.com/ugd/89d2ef_2d10da04d7bb4b968559f7d7ff07b580.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xoguwavosuje/nijunegafadap.pdfIn PDF document text
    • https://s3.amazonaws.com/nazekisigiduz/jigerukesuwiduni.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e09a66bc-0fa1-4fab-8ee3-af339bced193/sony_bdp-s1500_connect_to_internet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cff4dfaf-9821-4901-82dd-bb2c33be6f9f/what_is_the_movie_brave_new_world_about.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8946fa60-0838-4927-9f60-04448adad0d0/personal_pronouns_worksheet_grade_6.pdfIn PDF document text
    • https://s3.amazonaws.com/fasomusogapovi/6869112297.pdfIn PDF document text
    • https://ac614e2c-2e00-43e4-a80f-2c6bce9fb64b.filesusr.com/ugd/f103bb_6193f9a702804d8ba68ad2f3e64089c4.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/085faf68-ed77-41af-9139-6673491d6a14/zifupokokavorewevuxa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/39cffcf1-7562-4a49-8b66-9affe24fe5ba/supapawom.pdfIn 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_off00011743.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11743 5308 bytes
SHA-256: 6b6df765337beb4891550f2a0a3fa67a6de520fabdc25dcd80dddd9c746f30c8
font_01_sfnt_off00012956.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12956 11608 bytes
SHA-256: f6ecfb8933a52f4d49bfbd703082472bb527eebd3d838ed212f0be7d47006a7f