Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c8118c0b03ecafc…

MALICIOUS

PDF

76.0 KB Created: 2021-05-06 09:01:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 7945d97ffef816700bb0680cb91f96cb SHA-1: 6b09b4b8ddb2d3d96c192d4f228dc0b239b42c26 SHA-256: 9c8118c0b03ecafcc854b4ec73dccf433e2d7734d8567906ae34c731c6bc9c1c
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 hosting services and are designed to redirect users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate attempt to create a link farm on disposable hosting, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://nipisod.ru/strik?utm_term=how+to+tie+slip+knot+for+jewelry PDF link annotation
    • http://rewetuxavix.mypressonline.com/xupadepibulemogixage.pdfIn PDF document text
    • https://cdn.sqhk.co/sizozizaj/aK1jhjg/woodworking_classes_chicago.pdfIn PDF document text
    • http://kigaruzolalo.mypressonline.com/werixerasatasijola.pdfIn PDF document text
    • https://cdn.sqhk.co/remudejifi/ivasheE/the_chosen_app_for_windows_10.pdfIn PDF document text
    • https://cdn.sqhk.co/gonolesuzam/PDYbNie/39447266012.pdfIn PDF document text
    • https://cdn.sqhk.co/wejafivelij/RoafgeU/logasadilasaxan.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481540/normal_5fe829aab73b9.pdfIn PDF document text
    • https://cdn.sqhk.co/sijaxovada/hghhijc/79822841283.pdfIn PDF document text
    • http://vowujebotoza.mywebcommunity.org/57152492427.pdfIn PDF document text
    • https://cdn.sqhk.co/modajili/Oiid4ua/62196696627.pdfIn PDF document text
    • https://cdn.sqhk.co/rexukewanej/kEjdiaP/tijunupejugeziz.pdfIn PDF document text
    • https://cdn.sqhk.co/kevekelobivo/fkifia7/61027352989.pdfIn PDF document text
    • https://cdn.sqhk.co/kuwusemob/jathiji/tigesavezodavawazezodoju.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417809/normal_5fd943dd6f30f.pdfIn PDF document text
    • https://cdn.sqhk.co/zukasedu/cghTAgj/99227975350.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tavamikilav.myartsonline.com/can_you_air_fry_potatoes_without_oil.pdfIn PDF document text
    • http://nizofikunatafu.atwebpages.com/bedutuxowuwef.pdfIn PDF document text
    • https://s3.amazonaws.com/desenaz/12368080948.pdfIn PDF document text
    • https://s3.amazonaws.com/bokofapig/friendship_quotes_in_telugu.pdfIn PDF document text
    • https://s3.amazonaws.com/vedexajawo/betting_predictions_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/jixerubowi/tax_declaration_form_template.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_off0000e80f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE80F 4980 bytes
SHA-256: a8070a0f1ac1f0687a64afb508d6b0ec5c2b09b1b8ff5e8b37c8bcab8ac9322d
font_01_sfnt_off0000f92e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF92E 12584 bytes
SHA-256: bd900f8e4934053714c71736caef6184e2e56d8fc17beeeaa37003d5f9b4f835

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