Malicious PDF — malware analysis report

Static analysis result for SHA-256 2db0f04b10f48c16…

MALICIOUS

PDF

96.4 KB Created: 2021-04-06 20:56:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1e1297c044b1f5626e24d8c32253a1d3 SHA-1: 1df376a8f760aa1fa8dc1c9ebe1d8a361232345c SHA-256: 2db0f04b10f48c16d9d53fb9ba9e18a2fec2c5af35f1c1d758cbf2ef1116afac
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many pointing to disposable domains, and is flagged as a link farm by heuristics. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and URL patterns suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://nipisod.ru/strik?utm_term=walter+riso+libros+pdf+amores+altamente+peligrosos
    • http://fuxanujibiz.mygamesonline.org/fly_tying_vise_reviews_2020.pdf
    • http://excellent-spb.ru/storming_norming_performing_tuckmanf1cft.pdf
    • https://cdn.sqhk.co/sojuzafu/ilihhhh/52371612560.pdf
    • http://halfraire.xyz/is_casio_fx-115es_a_programmable_calculatorpoyrs.pdf
    • http://trynutra.shop/breviary_in_english9006l.pdf
    • https://samoderusewon.weebly.com/uploads/1/3/1/3/131383586/7464947.pdf
    • https://ximewenidurap.weebly.com/uploads/1/3/4/6/134651426/468d7897f620513.pdf
    • https://cdn.sqhk.co/pikevasoze/cdhagzS/parevarinuzebedolus.pdf
    • https://vesanawe.weebly.com/uploads/1/3/4/6/134602832/f56ab2aac2e98.pdf
    • https://zadopelujon.weebly.com/uploads/1/3/4/8/134884154/jexojalufufag.pdf
    • http://memisada.mygamesonline.org/7750437955.pdf
    • https://nabisafuv.weebly.com/uploads/1/3/1/4/131413222/365499.pdf
    • https://cdn.sqhk.co/jarixizotib/ejjeYnQ/95634231942.pdf
    • https://gujodoludota.weebly.com/uploads/1/3/2/6/132681740/gizaruxejen.pdf
    • https://cdn.sqhk.co/futidiwe/bQjaXI0/87922238518.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://nupuzawov.onlinewebshop.net/divebixirujod.pdf
    • https://uploads.strikinglycdn.com/files/6646a063-e1c3-45ae-9248-22f5fc4b038f/xemufitirebulekadugonit.pdf
    • https://uploads.strikinglycdn.com/files/833bb9da-be58-4c1d-bf68-a24520877052/14_pasos_en_el_proceso_de_investigacion_cientifica.pdf
    • https://uploads.strikinglycdn.com/files/338fcc2b-e3db-4663-85ff-90b5216a0317/48403744283.pdf
    • https://uploads.strikinglycdn.com/files/1df89cf7-8ff8-4f0a-bc9d-846627e5241e/nordictrack_audiostrider_800_review.pdf
    • http://zogoxuf.atwebpages.com/enzima_aldolasa.pdf
    • https://uploads.strikinglycdn.com/files/922e0aed-a089-4ca4-b179-3755b3266275/what_colors_go_with_olive_green_shoes.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001383e.bin
a288b1730310e057f0a2340d25838df7fe27a4d9218478d3a63eb8437ba99628		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1383E 5516 bytes
font_01_sfnt_off00014af0.bin
42639556bf97185b950fee449fd2441f90df4dec4e3b7fcb2a65d2a91c7cac66		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14AF0 12020 bytes

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