Malicious PDF — malware analysis report

Static analysis result for SHA-256 56025304237037ae…

MALICIOUS

PDF

86.6 KB Created: 2021-04-04 13:19:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 4943e02784b2cb4deb938a61e570326d SHA-1: 90e77b6ffab9fbd8a4ed7ad285bc4c968fafa016 SHA-256: 56025304237037aed82a3a776c434068ef9ada333d537aa5679fa4b4849bf58e
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://maypoin.ru/strik?utm_term=teorema+de+moivre+potencias+y+extraccion+de+un+numero+complejo PDF link annotation
    • http://nipojugotav.iblogger.org/wojis.pdfIn PDF document text
    • https://cdn.sqhk.co/kufusivekogo/eibziem/rajodizof.pdfIn PDF document text
    • http://rosutob.getenjoyment.net/literacy_progressions_nsw.pdfIn PDF document text
    • http://wavapivanuf.scienceontheweb.net/zilokimazaxakuxefefetot.pdfIn PDF document text
    • http://ronifibofizet.medianewsonline.com/will_there_be_a_harry_potter_tv_show.pdfIn PDF document text
    • http://kumujobu.iblogger.org/43759413488.pdfIn PDF document text
    • http://kusafomidufe.mywebcommunity.org/10655082311.pdfIn PDF document text
    • http://xawamiwupajev.mygamesonline.org/aaranya_kaandam_script_free_download.pdfIn PDF document text
    • http://gamowenugeg.sportsontheweb.net/how_do_i_connect_my_logitech_bluetooth_mouse_to_my_macbook_air.pdfIn PDF document text
    • https://cdn.sqhk.co/bupewazadufa/fSidiaA/driving_school_2018_download_apk.pdfIn PDF document text
    • http://gejurabek.getenjoyment.net/learn_forex_technical_analysis.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/3d9d765c-3916-408c-a5a4-917590395903/sigma_1009_sts_battery.pdfIn PDF document text
    • http://nufuwulevek.epizy.com/big_green_egg_grid_lifter.pdfIn PDF document text
    • http://sunapasu.epizy.com/milpersman_1306_extension.pdfIn PDF document text
    • http://dokedajonanumi.rf.gd/13876672655.pdfIn PDF document text
    • http://gifibulilak.epizy.com/xetemiwalisanoxopokojod.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d8f5b880-9ff1-4654-a3db-add92eb2fe22/2430545460.pdfIn PDF document text
    • http://zelalosiker.rf.gd/ditumiruzu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bda7553b-65a1-4083-92c4-518bd3a597b6/62418558953.pdfIn PDF document text
    • http://fegidil.rf.gd/41385860623.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fe1a27f0-7f0a-4cb4-b529-e727142ff36c/40250685529.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/752eaa79-deb7-41f9-96a7-36fd676eb2a6/tesig.pdfIn PDF document text
    • http://kopivenegi.epizy.com/66847023493.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB9B 5356 bytes
SHA-256: d0b127a92220b34412d905b50410dcd135be711056e9f140b7d44f4a37f617bb
font_01_sfnt_off0000fdc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDC8 12408 bytes
SHA-256: 499371120c3bc5b8361a658716e405829ff01f09ea4829ef42f7cfbb8650dc01
font_02_sfnt_off000126af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126AF 16148 bytes
SHA-256: 84f14f72235fb3b9cb2c6e906e67060b3123b14d3bfb58cd687b6aa2884134ec
font_03_sfnt_off00013bb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BB8 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2