Malicious PDF — malware analysis report

Static analysis result for SHA-256 a32d4539f555c5f1…

MALICIOUS

PDF

78.9 KB Created: 2021-09-19 05:55:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 1812aa11be98565071cf3a022438015c SHA-1: 4b282b9844ef0f855698e82f2607949ea3e991c0 SHA-256: a32d4539f555c5f15ae2fe3102d907c6ec5e9f873d5193a941d16920648fcbc5
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, with one heuristic specifically identifying it as a link farm on disposable hosting. The ML classifier strongly indicates maliciousness. While no scripts were directly extracted, the PDF structure and embedded URIs suggest an attempt to redirect users to potentially harmful content or exploit SEO tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

Heuristics 4

  • 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 http://cluboutletmoto.net/campannas/file/miwizifu.pdf In PDF document text
    • https://cs168.tw/upfiles/editor/files/bojogekatuxoxaforupaw.pdfIn PDF document text
    • http://salon-urody-bellis.pl/images/file/82281869693.pdfIn PDF document text
    • http://vipforiraq.com/userfiles/files/tininivimebubo.pdfIn PDF document text
    • http://soundspace.eu/Upload/file/nufenavosuxulinuz.pdfIn PDF document text
    • https://gamedunyasi.com/calisma2/files/uploads/mates.pdfIn PDF document text
    • http://vibrobeton.by/pics/files/tadamut.pdfIn PDF document text
    • http://robertfeinberglaw.com/images/edit_images/file/81460724992.pdfIn PDF document text
    • http://regcureguide.com/files/files/zudunuwobef.pdfIn PDF document text
    • http://standdominica.org/files/files/teguzijukemitipesarebut.pdfIn PDF document text
    • https://adikketiga.com/contents/files/46542528147.pdfIn PDF document text
    • https://alternativecarrepair.nl/userfiles/file/65094088371.pdfIn PDF document text
    • https://pharmnet.cz/ckfiles/files/files/fomebir.pdfIn PDF document text
    • http://supair-lux.hu/ckfinder/userfiles/files/84535001682.pdfIn PDF document text
    • http://smartvoicecom.com/userfiles/lanodulul.pdfIn PDF document text
    • https://rajatotogroup1.com/contents/files/10572196416.pdfIn PDF document text
    • http://jshtextile.com/UserFiles/file///17570384206.pdfIn PDF document text
    • http://119pump.net/d/files/33169960486.pdfIn PDF document text
    • https://indianhairtransplant.com/ckfinder/userfiles/files/notinopedokex.pdfIn PDF document text
    • http://cbcom.eu/ressource/site-image/files/vubel.pdfIn PDF document text
    • https://www.sudoku-cool.com/ckfinder/userfiles/files/28875133591.pdfIn PDF document text
    • http://elitk.ru/_files/zajetodape.pdfIn PDF document text
    • https://el-tall.pl/pics/file/16705390233.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=dragon+ball+xenoverse+1+apkPDF link annotation
    • 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ca07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA07 19624 bytes
SHA-256: bbca0e492122302295554705db2b4fe9f8cb81d1ae334b2a292e94e7fe08566e
font_01_sfnt_off0000fd7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD7B 10688 bytes
SHA-256: 595a0b6549e98d31d2c8e09c4972542014c8af63c76174a7db8fd0168cd4f0ca
font_02_sfnt_off00011602.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11602 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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