Malicious PDF — malware analysis report

Static analysis result for SHA-256 92b10e86b87e5e30…

MALICIOUS

PDF

90.1 KB Created: 2021-03-29 02:13:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 9ad3ef4765346239bd214012dc71ffbf SHA-1: 264d33e9630381408b4c0e899307ecf4684c86ec SHA-256: 92b10e86b87e5e30b09c7cc360bd48576a26543a7ee0122aa87e56dc78c8f6c6
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to potentially malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the heuristic firings point to the document's primary function being to host and distribute links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://jacksth.ru/award?keyword=adecco+group+annual+report+2020+pdf PDF link annotation
    • https://cdn.sqhk.co/tovitaxani/x3hbje0/kegefenopivetuzo.pdfIn PDF document text
    • https://cdn.sqhk.co/bemaxopig/hjBgcie/gartner_s_duct_cyst_treatment.pdfIn PDF document text
    • https://cdn.sqhk.co/muzedikerum/fMigFuE/ben_10_up_to_speed_free_download_hack.pdfIn PDF document text
    • http://gejesixave.scienceontheweb.net/64775098186.pdfIn PDF document text
    • https://cdn.sqhk.co/xamowizaso/skhgc9B/nofupojuwifolinex.pdfIn PDF document text
    • https://cdn.sqhk.co/labokezugumu/S3gc3QQ/avillion_berhad_annual_report_2018.pdfIn PDF document text
    • http://gulavimip.iblogger.org/aristotle_politics.pdfIn PDF document text
    • http://fefiwizam.sportsontheweb.net/human_resource_management_calicut_university.pdfIn PDF document text
    • http://jukojadijomefar.medianewsonline.com/get_in_the_van_henry_rollins_ebay.pdfIn PDF document text
    • http://luxuwum.mypressonline.com/40561355376.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://be9c8297-50e9-4ec8-be22-7cc4068ef96a.filesusr.com/ugd/fc3b0b_aa68a826dd384251b410a88672edf6ef.pdf?index=trueIn PDF document text
    • http://fepigemal.rf.gd/collins_easy_learning_chinese_characters.pdfIn PDF document text
    • https://21e323bd-7fdd-46e9-a6c7-4880e76d7610.filesusr.com/ugd/0a51c1_307d92677ce0440aa14f9e35627f00ec.pdf?index=trueIn PDF document text
    • http://pozogomeguko.epizy.com/numeric_and_geometric_patterns_grade_7.pdfIn PDF document text
    • http://tujefozumuresul.epizy.com/mazebegawejirakusunu.pdfIn PDF document text
    • https://43e3b293-20b6-4b74-9f7d-0eefffb4d2df.filesusr.com/ugd/11595e_4cc9ac5beb414bd4a1db45e9a80ed438.pdf?index=trueIn PDF document text
    • http://takamuwemevofe.epizy.com/camera_apps_for_android_free_apk.pdfIn PDF document text
    • https://e668d0bc-6b9c-4787-ac64-5363b724ef62.filesusr.com/ugd/6ec699_75d8dfa7ca9046259ff1d1290ebacd75.pdf?index=trueIn PDF document text
    • http://gepuxaxevo.rf.gd/23503526312.pdfIn PDF document text
    • https://8d59741e-369e-44be-b01e-8fbcb09d2d01.filesusr.com/ugd/7cefa9_ab6c543e87614e06bf3d7a006ea588f3.pdf?index=trueIn PDF document text
    • https://b0c090b1-cb02-46d8-8a69-3fb9d82636b6.filesusr.com/ugd/4dbf3f_117a667d957b41859d9a190771a55c91.pdf?index=trueIn PDF document text
    • http://rejefuwozumij.rf.gd/brunswick_secondary_college_uniform_policy.pdfIn PDF document text
    • https://86f5e18a-8766-4ae7-b9bf-31430b627380.filesusr.com/ugd/911c12_99b89f0d8b004d359172714b4f8505df.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_off00012084.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12084 5408 bytes
SHA-256: 98513476ea7fb7001fef92db5e55d6f0a7d2f1542d6300ce12841def641ede6d
font_01_sfnt_off000132fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132FE 11888 bytes
SHA-256: 029f98675d344160ffb002d43eb5e3caa1cb0635cdb04bcc9eb8f410ca1703b8