Malicious PDF — malware analysis report

Static analysis result for SHA-256 1939d4b7799a05cb…

MALICIOUS

PDF

79.3 KB Created: 2021-04-28 11:11:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 4243fde1582cb51a4b4b9651a57972fc SHA-1: 5c84a1d2afb29dd9ef135667d0799c6e0090fb7e SHA-256: 1939d4b7799a05cbddb8ca307c6412621b358ddda5a63d12bf967f0bbd41130b
186 Risk Score

Malware Insights

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

The PDF contains numerous external links, many hosted on disposable domains, suggesting a link farm or redirection scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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=the+crown+season+4+episode+6+av+club PDF link annotation
    • https://cdn.sqhk.co/womawuxinuge/Bjgjcji/kodefoposixibujaziw.pdfIn PDF document text
    • https://cdn.sqhk.co/sipebesoxu/gjpcJjg/tozogivubimafoduvoge.pdfIn PDF document text
    • https://fubupudixad.weebly.com/uploads/1/3/4/7/134742266/menedojikuxagajura.pdfIn PDF document text
    • https://cdn.sqhk.co/pagozixupezi/mPhfQgi/playstation_vr_lens_cleaning.pdfIn PDF document text
    • https://cdn.sqhk.co/fodexuxefeba/xcgcyjg/30679496745.pdfIn PDF document text
    • https://cdn.sqhk.co/tuxogafu/jbw8kgf/palewuban.pdfIn PDF document text
    • https://cdn.sqhk.co/nepajenine/dk0d5uQ/zombie_defense_games_steam.pdfIn PDF document text
    • http://wapadax.scienceontheweb.net/aws_certified_solutions_architect_study_guide_free_download.pdfIn PDF document text
    • https://cdn.sqhk.co/zisuzunon/FTibhfE/gst_status_check_by_gst_number.pdfIn PDF document text
    • https://kagapefox.weebly.com/uploads/1/3/4/8/134846757/wisabur-ritivisafixan-lumunobaxafiro.pdfIn PDF document text
    • https://cdn.sqhk.co/gapebeve/XhiggZ3/metal_slug_defense_mod_apk_2019.pdfIn PDF document text
    • http://vuzuwul.getenjoyment.net/ethics_baruch_spinoza.pdfIn PDF document text
    • http://tiriruno.sportsontheweb.net/kijoluvegaximapoguzag.pdfIn PDF document text
    • https://cdn.sqhk.co/rebabafa/azdSiig/homeschool_daily_schedule_kindergarten.pdfIn PDF document text
    • https://cdn.sqhk.co/dopiporajen/Sihgeji/wexifumi.pdfIn PDF document text
    • http://pizuwujigajanen.medianewsonline.com/28584302078.pdfIn PDF document text
    • https://joripipebepif.weebly.com/uploads/1/3/4/1/134131856/490da1.pdfIn PDF document text
    • https://cdn.sqhk.co/rasufizo/iiegFgi/30254258518.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://moxapowi.myartsonline.com/new_blob_response_type_application.pdfIn PDF document text
    • http://vujapoguxesak.myartsonline.com/a_simple_favour_trailer_ita.pdfIn PDF document text
    • http://ziwemasux.myartsonline.com/62282730782.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_off0000ed18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED18 5444 bytes
SHA-256: e5ff81a6b7058b9ab9dd88c9ef325809023c306e239ac6ac6cd0c0d60ade0a35
font_01_sfnt_off0000ff99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF99 10320 bytes
SHA-256: 3b879b9c116c581a5c5c1524e062b7a6464abafdb10c9a2f8ea05f6ca5d3a1b7
font_02_sfnt_off0001230f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1230F 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e