Malicious PDF — malware analysis report

Static analysis result for SHA-256 776f131aaa74621c…

MALICIOUS

PDF

90.2 KB Created: 2021-04-01 22:00:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: df8f801b315dfa6da40dfbddf893ba36 SHA-1: b542b193591b0b5f6b376c7fb827c0932d3968e1 SHA-256: 776f131aaa74621cb610c5c7e009178fa433f447aa18a4198cc025b647ca0130
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 0.9985

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://zajinet.ru/wix?keyword=tp+link+range+extender+manual+tl-wa860re PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4425010/normal_5febfb87b7299.pdfIn PDF document text
    • http://xalapuzim.sportsontheweb.net/15824842278.pdfIn PDF document text
    • http://natorg.fun/xotipetamsxqa.pdfIn PDF document text
    • https://cdn.sqhk.co/mumesimasozo/eMifojf/84621127000.pdfIn PDF document text
    • https://cdn.sqhk.co/muvifisi/hjcLOhh/used_helicopter_flight_simulator_controls_for_sale.pdfIn PDF document text
    • http://phulop.store/the_pilgrims_progress_study_guidep2682.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374696/normal_5fcb8dd661e0f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368767/normal_60274aad8d6f7.pdfIn PDF document text
    • https://cdn.sqhk.co/nulegudup/die2Sjh/xomoluwusekiduwudilub.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460228/normal_603cae559efa5.pdfIn PDF document text
    • https://cdn.sqhk.co/vujaderaz/KPWjdjb/all_creatures_great_and_small_book_summary.pdfIn PDF document text
    • http://rijewomel.scienceontheweb.net/where_can_i_watch_stephen_king_movies_for_free.pdfIn PDF document text
    • http://rejemezurufoveg.mywebcommunity.org/tewutepisulubawib.pdfIn PDF document text
    • http://xokebidukefu.getenjoyment.net/callsign_chaos.pdfIn PDF document text
    • http://fontawesome.iohttp://fontawesome.io/license/In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/f9360f05-c2ed-45e5-8f5c-b9359213488f/what_do_you_call_a_woman_who_husband_has_died.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eda267c7-cd08-4744-a462-e0276a059d42/wajew.pdfIn PDF document text
    • https://9907981b-0bc7-4fd3-a434-169f7cdadf42.filesusr.com/ugd/575363_00e2d202762649bd848e0cc9e7678f42.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/3d89c394-62eb-4f1e-811c-197b5826223c/draw_with_jazza_creating_characters.pdfIn PDF document text
    • https://e0f910ba-f4aa-4d6b-87f6-24d78cda99ab.filesusr.com/ugd/cc15ef_e9e26e0998584e629e1d59472ce3e40d.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/96242957-16c5-4592-a3e1-fd48dc052c11/mawugimiliru.pdfIn PDF document text
    • https://141ebdc9-a3c9-4c6d-b8f9-366dbf139dec.filesusr.com/ugd/46bfb0_30c7b566dea44f6eaafa60acf2f65b50.pdf?index=trueIn PDF document text
    • https://d5fd0048-bb8d-45a1-ba21-28d1cb0b7162.filesusr.com/ugd/5e8de6_c903ad5f20c14d31866a3ab9788ec18d.pdf?index=trueIn PDF document text
    • http://pitaken.onlinewebshop.net/91422521599.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010228.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10228 3136 bytes
SHA-256: 06937865d34725fd87f913930162243492e684396ecbb2d25e2c45ffaa11b536
font_01_sfnt_off00010d3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D3C 2096 bytes
SHA-256: a18d5f5a82bda677c15f04bf346db8ab46890a0a79786e3ec1ddedc0806c1b7b
font_02_sfnt_off000116ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116FF 5796 bytes
SHA-256: 2976a8a4c5acbdd29e3500b9b40005cea4d4a199626fb8ea814c8915cc1d6ad4
font_03_sfnt_off00012ac4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AC4 14428 bytes
SHA-256: 4f626daa46ea4a002b92b0c1379a30527b344931a42496a26ef9b337fbfceadb