Malicious PDF — malware analysis report

Static analysis result for SHA-256 79fe99c196402188…

MALICIOUS

PDF

77.9 KB Created: 2021-03-24 18:46:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 2ffc48d8e05828dc14bd34aa5d099a4e SHA-1: b3e80e038583d81997a77eec45dc528e9097907b SHA-256: 79fe99c1964021888da0863e7c8f9bcac0c99f04930a0834a27f88c314c24259
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to disposable domains, suggesting a link farm designed to redirect users to malicious content. The document body, though heavily obfuscated, contains references to wkhtmltopdf and a date, indicating it was likely generated programmatically to host these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://mezovuduw.ru/wix?keyword=como+hacer+un+indice+en+word+2010 PDF link annotation
    • http://yandex-dostav.ru/apple_pencil_case_targeth72d1.pdfIn PDF document text
    • http://xuzotudaraderuf.mypressonline.com/47312578669.pdfIn PDF document text
    • http://d2-club.ru/garmin_oregon_650t_how_to_useafvv5.pdfIn PDF document text
    • http://kinoxca.xyz/king_kutter_rotary_tiller_tiness0g0h.pdfIn PDF document text
    • http://idealicaitalia-official.site/what_happens_in_the_end_of_eleanor_and_parku6st5.pdfIn PDF document text
    • http://tigafik.mygamesonline.org/44927946419.pdfIn PDF document text
    • http://reawont.online/cellular_respiration_experiment_with_yeast_and_methylene_blue_lab_report_conclusionjqhwq.pdfIn PDF document text
    • http://dezlice.ru/42731946828ql4dk.pdfIn PDF document text
    • http://nusowutevu.getenjoyment.net/90446411056.pdfIn PDF document text
    • http://service-hire.com/8753651592imn0w.pdfIn PDF document text
    • http://www19216801.site/how_to_clean_a_sewing_machinea73lk.pdfIn PDF document text
    • http://gamowenugeg.sportsontheweb.net/janobesemok.pdfIn PDF document text
    • http://digtalcaliper09.xyz/11885040368wjuoi.pdfIn PDF document text
    • http://kanshoper.site/71966950508gash8.pdfIn PDF document text
    • http://grusha.space/valufupesigijikibamokikid20d8.pdfIn PDF document text
    • http://nopezimugabotik.mygamesonline.org/butozasoxatinuberelovabo.pdfIn 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/2059249b-f076-4f64-8a67-906f277b40b6/whirlpool_thin_twin_water_wont_drain.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/35280cca-6b8f-4f43-8c82-6c6d7b178d87/what_does_lets_chalk_it_up_mean.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3e81700d-4148-4c95-992b-2b8d4d97d3ce/sandisk_secure_access_password_hack.pdfIn PDF document text
    • http://pagiwufuvefukuf.epizy.com/regesifavikokitis.pdfIn PDF document text
    • http://favigagiwu.epizy.com/letter_d_phonics_worksheets.pdfIn PDF document text
    • http://lizedugenok.epizy.com/mafivobotuwoxoganagibavaf.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/72f08070-0e10-4bc4-8301-99d37c7e9298/anti-oedipus_capitalism_and_schizophrenia.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_off0000f22d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF22D 5292 bytes
SHA-256: 793801b1bb4196a4c3ad8b9199056ed00564cb08a734a4f457d53c75de2f5b41
font_01_sfnt_off0001040c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1040C 11192 bytes
SHA-256: 001ea57e91cc5611617688f919e32ce9da13a173957a7aa0d23d6ab1584b2ea1

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