Malicious PDF — malware analysis report

Static analysis result for SHA-256 0edb3218c9711721…

MALICIOUS

PDF

100.3 KB Created: 2021-05-12 19:06:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: fff7df2306965695694a87bf0c41a2bc SHA-1: e18c860cf2f28ce736dbca171e6190683d452b6b SHA-256: 0edb3218c9711721a912f7874982aa201357a9fd3ecdf9c9f91ad9c79b9efaf6
126 Risk Score

Malware Insights

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

The PDF file is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous embedded URLs pointing to disposable domains, many of which are part of a link farm designed to obscure the ultimate destination. The document body, though heavily obfuscated, suggests a lure related to trigonometric functions, likely to deceive users into clicking the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 5

  • 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.
  • 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://seumenha.ru/strik?utm_term=funciones+trigonometricas+tangente+ejercicios+resueltos PDF link annotation
    • http://miwuzobi.sportsontheweb.net/nafta_certificate_of_origin_fillable.pdfIn PDF document text
    • http://zuduwamani.mypressonline.com/boolean_search_strings.pdfIn PDF document text
    • http://vozuzutiwajuzip.getenjoyment.net/apology_letter_sample.pdfIn PDF document text
    • http://ruwegekugite.22web.org/gejoxatukinif.pdfIn PDF document text
    • http://bugiwuxad.medianewsonline.com/affidavit_form_zimbabwe.pdfIn PDF document text
    • https://wosufibataba.weebly.com/uploads/1/3/4/8/134866098/nexox-lezexipox-lumiti-tolewonas.pdfIn PDF document text
    • http://kipamaf.22web.org/king_koil_bedsheet.pdfIn PDF document text
    • http://pifofobexaxel.mypressonline.com/26956139904.pdfIn PDF document text
    • https://jevixivuxed.weebly.com/uploads/1/3/4/6/134622771/7698301.pdfIn PDF document text
    • http://kaxiwemusemoj.mypressonline.com/boston_market_nutrition.pdfIn PDF document text
    • https://gozaxuvo.weebly.com/uploads/1/3/4/6/134612917/1326495.pdfIn PDF document text
    • https://zamizugupaf.weebly.com/uploads/1/3/3/9/133999186/08b2ae1be13.pdfIn PDF document text
    • http://giwosesupalu.medianewsonline.com/design_patterns_explained_github.pdfIn PDF document text
    • http://rarubife.mygamesonline.org/numark_ttusb_belt_size.pdfIn PDF document text
    • http://xariketixagat.mypressonline.com/amjad_islam_amjad_books_download.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lijowavatajo.myartsonline.com/nobilojovorizo.pdfIn PDF document text
    • http://rurebafib.onlinewebshop.net/kagowaxewuwuzefutimijape.pdfIn PDF document text
    • http://tonuvewogi.rf.gd/32216979913.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8df8d6a4-988e-468b-a72f-9bda07cb482c/fikaziropubuvenak.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f0589664-5994-490c-8a89-5d132d192845/under_the_dome_tv_cast.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_off00012440.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12440 5152 bytes
SHA-256: b736954990df72f6251cbdf2cadb451578668a78248ec8f91ae19f921218e277
font_01_sfnt_off000135b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135B3 2784 bytes
SHA-256: e59e8144f7dd15b151e843d7fca980f451f01dcb62d6a1f54b62c91c173b8086
font_02_sfnt_off000140e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x140E8 12940 bytes
SHA-256: e9ba0ff95d2654aad2950471c0c90d53a4e390b8cf3bc3238ef897140b2cbd50
font_03_sfnt_off00016b1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16B1D 16192 bytes
SHA-256: f09c0774ab2a1a943a06c2453b01dcfc3857a07d49b53ffce1eb62089b013493

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