Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb3b97ea8613ce4b…

MALICIOUS

PDF

79.0 KB Created: 2021-02-25 05:44:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 5650a28455ba0dbd2e44a86fe0842893 SHA-1: da9c5dabdc26ebe644f53eff9e193902c39e37fb SHA-256: cb3b97ea8613ce4bf6f624a8ecbb0f1b9af3f5d4ac3b0207686a8fa303831d4c
134 Risk Score

Malware Insights

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

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 and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://druttle.ru/strik?utm_term=50+shades+of+grey+freed+google+drive PDF link annotation
    • http://rejemezurufoveg.mywebcommunity.org/saduko.pdfIn PDF document text
    • https://cdn.sqhk.co/zosiwikiw/MgVjfL9/car_manufacturer_tycoon_mod_apk_2._4._3.pdfIn PDF document text
    • http://newipufisatag.scienceontheweb.net/kingdom_hearts_1.5_after_agrabah.pdfIn PDF document text
    • http://retamos.mygamesonline.org/why_did_the_bear_attack_in_the_revenant.pdfIn PDF document text
    • https://cdn.sqhk.co/dukapudubi/YoEFnnX/tekosuzejesiwulirozi.pdfIn PDF document text
    • http://kutatit.getenjoyment.net/gravity_falls_journal_3_pages.pdfIn PDF document text
    • http://jaralet.getenjoyment.net/bijumoresoxulijutu.pdfIn PDF document text
    • http://kozidozilujivox.getenjoyment.net/3921188512.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
    • http://fupuvafibip.rf.gd/27836961276.pdfIn PDF document text
    • http://dasabenanej.epizy.com/lds_hymn_medley_piano_sheet_music.pdfIn PDF document text
    • http://perexuwofogefo.onlinewebshop.net/xerox_workcentre_3325_driver_windows_10.pdfIn PDF document text
    • http://jojugabijogi.rf.gd/mimibej.pdfIn PDF document text
    • http://xojixitutatafu.epizy.com/piecewise_linear_functions_worksheet_answers.pdfIn PDF document text
    • http://rogofideb.onlinewebshop.net/baxetunavogegaxoga.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eba0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBA0 5104 bytes
SHA-256: dc8209e3faac50196a996d28796953a9204eaa5fdeaf030f033be876e23b164f
font_01_sfnt_off0000fd13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD13 10508 bytes
SHA-256: 00526757c5ff7fce8e5d68299c1644c5408846fa813b59aa716baf8989ebb923
font_02_sfnt_off000120a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120A9 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176