Malicious PDF — malware analysis report

Static analysis result for SHA-256 5af4a71928667c86…

MALICIOUS

PDF

85.2 KB Created: 2021-03-29 19:21:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: f2ff4df6a3b0c2d1025a1b0f0e1f095b SHA-1: ed19da34621e2780f5819a60d6130553d3894b53 SHA-256: 5af4a71928667c8693c40491c0631e0a947e348b8a20512194bddbe80a6f9bcb
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many hosted on disposable domains, suggesting a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a tactic of directing users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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://xajibur.ru/award?keyword=states+abbreviations+pdf PDF link annotation
    • https://cdn.sqhk.co/zetuzire/hejgRii/31005766334.pdfIn PDF document text
    • https://cdn.sqhk.co/navotezive/fjghitp/sims_3_generations_guide.pdfIn PDF document text
    • https://cdn.sqhk.co/kekagate/OTgdTgg/four_in_row_game_free_download.pdfIn PDF document text
    • https://cdn.sqhk.co/bomemenun/wBhhjbV/how_to_make_bubble_tea_popping_bubbles.pdfIn PDF document text
    • https://cdn.sqhk.co/rozesivotix/jcGVixF/xitebuwepojozuril.pdfIn PDF document text
    • https://cdn.sqhk.co/pugudanirav/bhgBhhe/gusezurodaj.pdfIn PDF document text
    • https://cdn.sqhk.co/kowumutajaw/cjdjfEo/calendar_2020_printable.pdfIn PDF document text
    • https://cdn.sqhk.co/gosuzufus/dw9heij/3503608443.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://61090d85-22e6-4724-b969-52a17785150c.filesusr.com/ugd/952c2e_c2614480af5e4a17a72644ce6cb518cd.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/7ab7eaa3-5ba1-40d1-92e5-695e61b307cc/john_deere_24t_baler_years_made.pdfIn PDF document text
    • https://5071cc05-3fa2-46b1-b944-d2523ca4b51d.filesusr.com/ugd/62e2c1_c8d41166dee74c478809ee8ed28a453e.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c6660564-8a07-4f74-96b7-fe845950e123/32440306075.pdfIn PDF document text
    • https://f7cac2f2-528f-490f-9bef-cb2448a877de.filesusr.com/ugd/529ba0_59f08b6949d04fdd85916a72f13ecdf6.pdf?index=trueIn PDF document text
    • https://e8c82854-2a0b-4c0f-82de-bac600ce06e6.filesusr.com/ugd/d017d5_54998fd632814d0e87f89a1df41dba22.pdf?index=trueIn PDF document text
    • https://5d94d51b-2702-4b64-8df3-eadd022f3edc.filesusr.com/ugd/2ddd39_7d907aa3fba644bd82bbd929cbe58f15.pdf?index=trueIn PDF document text
    • https://caf0f927-206f-4b4e-aa34-0dd3da53679b.filesusr.com/ugd/83d902_bae1e5d8d0db4676aa52d15d689ed8b4.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/b630f00e-6a51-474b-bc23-ac0bc603a99d/55829925394.pdfIn PDF document text
    • https://cc67bef4-e22e-42fd-bf01-3f02b15f800b.filesusr.com/ugd/080020_fa34b62528254fce9b0200350b35d897.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_off00011055.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11055 5308 bytes
SHA-256: 9cd224081ea924725c825c4e63dd5b8d9175fca373068c53225a1a21cdd085f4
font_01_sfnt_off0001226c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1226C 11052 bytes
SHA-256: 5ff9de4a1b33d10734cff6c3d803215a4d5ff13ae28f0dbc6016bc6404902181