Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5d767044e2e1b15…

MALICIOUS

PDF

77.0 KB Created: 2021-04-23 16:46:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 7fc8632098a5ecc87a7609d74a72ed05 SHA-1: 22cf5ab3b7fdaf6f1fa1d9b853779f9aab4a13d9 SHA-256: c5d767044e2e1b15899c0a4d4eb4009ff94f6ecffe34a351199bca22598eef54
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to disposable domains and link farms, indicating a phishing or malware distribution attempt. The document body, though heavily obfuscated, contains references to 'wkhtmltopdf' and a date, suggesting it was generated programmatically to host these malicious links.

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://mezovuduw.ru/strik?utm_term=what+is+economic+interdependence PDF link annotation
    • http://samafutanub.mypressonline.com/aromatherapy_guide.pdfIn PDF document text
    • https://cdn.sqhk.co/sorubajuzoxe/j6r6jew/fumovalukidapokuvovu.pdfIn PDF document text
    • http://delozofize.scienceontheweb.net/vafenolurofiwa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464067/normal_60123522c824e.pdfIn PDF document text
    • http://pifowovumuwe.medianewsonline.com/bank_success_fast_preparation_book_free_download.pdfIn PDF document text
    • https://cdn.sqhk.co/tigufarejeti/jcihHij/lezinaxoxosanagemuvaloju.pdfIn PDF document text
    • http://ziwewixowele.sportsontheweb.net/relefazuxipi.pdfIn PDF document text
    • https://cdn.sqhk.co/limiwebu/gghdGR4/unlimited_internet_speed_apk_for_pc.pdfIn PDF document text
    • http://vataponuxizeliz.mywebcommunity.org/83674568291.pdfIn PDF document text
    • https://cdn.sqhk.co/jugomuzuteb/rDjghba/passport_size_photo_maker_app.pdfIn PDF document text
    • https://cdn.sqhk.co/kibukumivu/UCjiiZ0/zinefidibuzimuduvesejibod.pdfIn PDF document text
    • https://cdn.sqhk.co/libavesonon/Xwhex9B/slime_shop_3d_model.pdfIn PDF document text
    • https://cdn.sqhk.co/melipetoluf/ghnChe9/kikolikutinibizesagop.pdfIn PDF document text
    • http://jedivemogikopad.22web.org/introduction_to_ajax_programming.pdfIn PDF document text
    • https://cdn.sqhk.co/bomemenun/io0Ghdw/tizumanerosurubivesadox.pdfIn PDF document text
    • https://cdn.sqhk.co/xemugugafot/mjdggje/increase_tiktok_followers_without_human_verification.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471475/normal_602f9f3a666d2.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jixuwir.rf.gd/the_addiction_1995_full_movie.pdfIn PDF document text
    • http://movasedumanepe.onlinewebshop.net/irrigation_system_design_an_engineering_approach.pdfIn PDF document text
    • http://faputigumajo.rf.gd/73688449708.pdfIn PDF document text
    • http://zitadufafasid.onlinewebshop.net/printable_origami_instructions.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_off0000f15b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF15B 5296 bytes
SHA-256: 26f604492a771dedb764372d9afb3b1ff5fbfa6bf8d1271507f1d9b38dc7ef94
font_01_sfnt_off0001033b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1033B 10416 bytes
SHA-256: 704d98a674609f62d341960b0f4cc9dfdf56c4fb78cbdc90c3eb51cc6eb46b7e

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