Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad21c82f5af97e21…

MALICIOUS

PDF

79.2 KB Created: 2021-04-26 10:42:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 5801b5f7e20bf56c10534d65afae2d40 SHA-1: 5ad6ac6e7e2971981b08a055cf77eba9f4e30fdf SHA-256: ad21c82f5af97e2141912396cc66807647337372c39eaecfde47d5e90272acfa
226 Risk Score

Malware Insights

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

This PDF file is identified as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution attempt. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to potentially harmful content. The document body, though heavily obfuscated, contains references to 'wkhtmltopdf' and a date, hinting at its generation method and creation time. The presence of embedded URLs and the heuristic 'PDF_SEO_LINK_FARM' strongly suggest the primary goal is to drive traffic to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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.
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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://fokemale.ru/strik?utm_term=livros+do+marques+de+sade PDF link annotation
    • http://m-ryanaf.site/para_que_sirve_la_linea_de_montajegyqna.pdfIn PDF document text
    • http://jeruwit.mygamesonline.org/la_biblia_de_estudio_explicada.pdfIn PDF document text
    • http://haustova.com/las_vegas_tourism_numberssin71.pdfIn PDF document text
    • http://rowaxamapitowej.getenjoyment.net/what_are_the_safe_areas_of_new_york_city.pdfIn PDF document text
    • http://japebevavagufip.22web.org/bangalore_days_bgm_song.pdfIn PDF document text
    • http://stonersfranchise.com/how_to_reset_rip_curl_rifles_tide_watchlr95s.pdfIn PDF document text
    • https://cdn.sqhk.co/nejisakatok/jdi250d/woretaxalim.pdfIn PDF document text
    • https://cdn.sqhk.co/nixafusoda/hFhhdDe/nirigajixi.pdfIn macro / runtime command snippet
    • https://cdn.sqhk.co/nejisakaIn macro / runtime command snippet
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://watokugen.epizy.com/95201329651.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2de1d6ea-002d-48d0-8e2b-74f9176a3f47/1999_ford_ranger_manual_transmission_fluid_type.pdfIn PDF document text
    • https://b46c4cda-4951-41c0-816f-bbf02eee4d9b.filesusr.com/ugd/4ff992_51809663331f489d94fa89ed590146c6.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/5cb07d83-c50e-412a-96ea-e3bb611b3870/53430340450.pdfIn PDF document text
    • http://rivapuremamoge.epizy.com/smile_images_wallpaper.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2aa255f4-dd9b-4249-b0bd-72c85cbaa911/33018997128.pdfIn PDF document text
    • http://wojibikifi.myartsonline.com/sylvia_day_books_ranked.pdfIn PDF document text
    • https://5071cc05-3fa2-46b1-b944-d2523ca4b51d.filesusr.com/ugd/62e2c1_22d37fac419b4b48b4d3b2a1649d5b1c.pdf?index=trueIn PDF document text
    • https://0ca3454e-05ac-49fc-8d00-644b1af7be3c.filesusr.com/ugd/8bf3fc_ffc2126dc8554f7aa602b5913eac2e85.pdf?index=trueIn PDF document text
    • https://ec2d952e-5494-46d8-b841-fee222248b17.filesusr.com/ugd/9713d5_33397b9a29e344d680536d9f06069207.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/6089b6f9-b329-48a0-b006-a8c68d4d0b56/manogededozunanivas.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/64f351e9-3da3-4d27-afc1-93298b69b420/wilson_rockwell_hardness_tester_for_sale.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_off0000f557.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF557 5064 bytes
SHA-256: ae36333a8e8902715081283e33473f94e579d8bd20dfa7476a2286a164a7e78b
font_01_sfnt_off0001067a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1067A 13316 bytes
SHA-256: 66baa2c6693b5643305f4d24c03c86486d93cd932be5c850adb93cfdd82c8ae6

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