Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5b9ef497b2ecd01…

MALICIOUS

PDF

78.5 KB Created: 2021-04-19 11:27:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: c02d5078b6854c2a33ca7026f95c8967 SHA-1: 22d19118526a1d29939a5e44537cab681b675f28 SHA-256: f5b9ef497b2ecd01111969237b102fa47800d9cdacc724f8fa155f5babcd1cde
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to disposable domains and are likely part of a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically phishing. The document body, though heavily obfuscated, appears to be a lure related to 'LG inverter air con fault codes', aiming to trick users into clicking the 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://jottigo.ru/strik?utm_term=lg+inverter+air+con+fault+codes PDF link annotation
    • https://cdn.sqhk.co/puvubuzu/gsgiI6n/rinenanerivodovitufifup.pdfIn PDF document text
    • http://tamoxagutikesem.22web.org/how_to_install_swann_4k_security_system.pdfIn PDF document text
    • http://xugaguf.mypressonline.com/what_are_the_5_ps_of_planning.pdfIn PDF document text
    • https://cdn.sqhk.co/zimopaji/ifeigos/alchemy_jug_5e_cost.pdfIn PDF document text
    • http://zemimumaloger.iblogger.org/adobe_photoshop_elements_for_pc.pdfIn PDF document text
    • http://vijexibat.mywebcommunity.org/11477880561.pdfIn PDF document text
    • http://zokugorevat.mywebcommunity.org/accounting_cycle_exercises_iii.pdfIn PDF document text
    • http://kuliwegi.sportsontheweb.net/antologia_de_cuentos_honduras.pdfIn PDF document text
    • https://cdn.sqhk.co/kesavaki/gAhcM5X/smith_pharmacy_hours_brigham_city.pdfIn PDF document text
    • http://roselosudeve.sportsontheweb.net/ccna_notes_free_download.pdfIn PDF document text
    • https://cdn.sqhk.co/senagoxosog/giLIheH/xipekuwinizavesuxaxulegox.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://deneboj.rf.gd/pofoken.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/53783dce-9013-4e1e-ae04-18081382f7e7/vatawolusiwubonenodibug.pdfIn PDF document text
    • http://donomazuzewojul.epizy.com/21322917568.pdfIn PDF document text
    • https://c11ab09e-384c-4904-8c79-5ef6f38008df.filesusr.com/ugd/7131a6_6f1f5d15dd564f97ab8f50f567e707e9.pdf?index=trueIn PDF document text
    • http://lafeseg.rf.gd/avast_free_kuyhaa.pdfIn PDF document text
    • https://bdc3fad0-85dd-4e34-85f7-620d54d4ff6f.filesusr.com/ugd/10cedf_9dbcf6578bf746f8b712ddbf350de703.pdf?index=trueIn PDF document text
    • http://newigumumakewi.epizy.com/82222047762.pdfIn PDF document text
    • http://zefawosejek.rf.gd/animatronic_hand.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a71036df-c019-4843-ac7f-8ce0f231a691/vuzadunawupumo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6a139d88-a6a6-443b-9033-05eff468d51d/simile_and_metaphor_worksheets_for_grade_3.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e775e0b0-a13a-471d-84b2-0b766e37e70b/sato_cl4nx_plus_driver.pdfIn PDF document text
    • http://tuxexagixib.rf.gd/mechanical_instrumentation_lab_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e4f37e89-7a03-4ecc-a6e6-c01742b5ab86/20_000_leagues_under_the_sea_pages.pdfIn PDF document text
    • http://rigeladujonij.epizy.com/bajirao_mastani_movie_song_bestwap.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_off0000f55d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF55D 5188 bytes
SHA-256: 918406d5863b2532d2e7c524ec76b373ef38eb6fa9ae2aea1a0e4ebfaa550561
font_01_sfnt_off00010725.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10725 10924 bytes
SHA-256: 8dbd34d354703c2c4cacc9917b17ca74c3807b266d8b63bb3500a1ab1cb073c1