Malicious PDF — malware analysis report

Static analysis result for SHA-256 3892712accfdc007…

MALICIOUS

PDF

107.8 KB Created: 2021-04-06 21:31:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: d04d97529120e3016b51f13785cc19d4 SHA-1: 1a95f8219db680a1b7b0ec256ebc1e59497b7446 SHA-256: 3892712accfdc007b7f4a55ed91f41ce771bc1a148ee15f2f72ecc1c40a81bb9
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://maypoin.ru/award?keyword=hanuman+chalisa+telugu+pdf+ms+rama+rao PDF link annotation
    • https://cdn.sqhk.co/vimerokil/z1geBjc/sukizenitorekafokeni.pdfIn PDF document text
    • http://tubujagowip.iblogger.org/39101136042.pdfIn PDF document text
    • https://cdn.sqhk.co/tazuxalana/gjKFYji/2019_ford_expeditions_for_sale_in_iowa.pdfIn PDF document text
    • https://cdn.sqhk.co/kuwusemob/jathiji/tigesavezodavawazezodoju.pdfIn PDF document text
    • http://fijixedi.22web.org/amendment_agreement_format.pdfIn PDF document text
    • https://cdn.sqhk.co/lojosexotak/dwdieZp/89252085652.pdfIn PDF document text
    • https://cdn.sqhk.co/fakodozug/diggihc/weed_leaves_twisting.pdfIn PDF document text
    • https://cdn.sqhk.co/jufebarur/bjd0gfP/xewewonunifibexomuxu.pdfIn PDF document text
    • https://nepagezefo.weebly.com/uploads/1/3/4/4/134472827/xixan.pdfIn PDF document text
    • https://nojinogexosop.weebly.com/uploads/1/3/4/6/134695112/zudakazisegemo.pdfIn PDF document text
    • https://jefolujolu.weebly.com/uploads/1/3/6/0/136096950/tubarenebi.pdfIn PDF document text
    • https://cdn.sqhk.co/mitajaso/jbhfhdm/management_reporter_2012_cu16_system_requirements.pdfIn PDF document text
    • https://cdn.sqhk.co/woxemumi/Kjdheid/29034653615.pdfIn PDF document text
    • https://zebonusifok.weebly.com/uploads/1/3/4/5/134509505/a3612e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • https://uploads.strikinglycdn.com/files/ed1bb46d-2d62-4e5e-b682-bc6db6c17244/niveles_de_lectura_literal_inferencial_y_critica.pdfIn PDF document text
    • https://ac25a69f-a984-4293-9c3d-8c9e0f062535.filesusr.com/ugd/cbf077_5cfc7d15aadb44a380136c22e4f34049.pdf?index=trueIn PDF document text
    • https://78bdfa25-736e-4945-a764-db21511aacb9.filesusr.com/ugd/9bd82e_e46b9dc87b0246d3a8e9a9fc953aa952.pdf?index=trueIn PDF document text
    • https://dfa52777-3edb-460f-9b14-ca5101cd4ecc.filesusr.com/ugd/5360f8_bd99349f577a4b80a42d293f73359732.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/f1ecf492-daf6-4a10-9b74-970fceb1ee26/how_to_find_sum_of_interior_angles_in_polygon.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/818f9512-3f4c-4b42-b329-8d2fc2464398/nevefabegujori.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7adbd950-d844-4032-966c-6ed6fc91f576/no_game_no_life_zero_reddit.pdfIn PDF document text
    • https://c8070bf9-ed42-4c5d-8eb8-ca35ee70f136.filesusr.com/ugd/d38238_e1687f092d47434289e73436bfaf5fb3.pdf?index=trueIn PDF document text
    • https://ab2ac9d4-4772-4872-829d-c19fde0a4f90.filesusr.com/ugd/b919b3_f234d66fb1c6494996d1643776861e83.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ff88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF88 5528 bytes
SHA-256: 4b3bb5c2bba1b372851c6ff27cc00b188dac4d9f08eeb43d03ce8b198e196ed3
font_01_sfnt_off0001122c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1122C 55308 bytes
SHA-256: e60d8b56e733b95e022ace240ff104fbab0f20e037aba64fd103187b7638040a
font_02_sfnt_off00017880.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17880 11088 bytes
SHA-256: b6bb95255217baf4e6e3d232bae9538d1e7d2f1696c1c3709a4ea63911cc88bf