Malicious PDF — malware analysis report

Static analysis result for SHA-256 a782eb83eab5a3d8…

MALICIOUS

PDF

101.5 KB Created: 2021-02-17 12:44:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 6bc218964a07f7455d8cbfb3da63f7e2 SHA-1: f2bbd8f59e6e0e7ff7c59c21fa744757b3ef78a6 SHA-256: a782eb83eab5a3d887a8478b7028d2333cf5cb63f64d261cc44df191b436d288
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded URLs, with one heuristic specifically identifying it as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were extracted, the PDF structure and embedded links suggest an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://jacksth.ru/wix?keyword=%25D8%25AA%25D9%2588%25D8%25B1%25D8%25A7%25D9%2586+81+%25D8%25AC%25D8%25AF%25DB%258C%25D8%25AF PDF link annotation
    • http://indonesia2health.online/300068808549v3j9.pdfIn PDF document text
    • http://agentsecure.space/94675332323l8l5n.pdfIn PDF document text
    • http://muslims.net/josudazalegutukoc2836.pdfIn PDF document text
    • http://samyog.ru/biziv27a3w.pdfIn PDF document text
    • http://doucheapp.xyz/4_piece_heart_puzzle_template31b27.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464521/normal_601c5f7bd29a2.pdfIn PDF document text
    • http://helpforteam.com/22000938212oblbq.pdfIn PDF document text
    • https://lupawepenotude.weebly.com/uploads/1/3/1/6/131606523/lenexawuvakuna.pdfIn PDF document text
    • http://milanbeach.fun/arduino_esp8266_wifi_shield_datasheetpdbpm.pdfIn PDF document text
    • http://krepezh.guru/xejokezedebigok5wocz.pdfIn PDF document text
    • http://normab-id.com/examen_de_practica_ceneval_exani_ii21e5r.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4401982/normal_5ffdc4c2f1fc6.pdfIn PDF document text
    • http://hs-life.ru/digitech_rp155_pricefgjbg.pdfIn PDF document text
    • http://delifeschool.com/plants_vs_zombies_androidzi97p.pdfIn PDF document text
    • http://lavkavkusa.store/hallmark_movie_channel_on_amazon_fire_stickpl2p7.pdfIn PDF document text
    • https://cdn.sqhk.co/vitikitema/i5HnX3C/train_your_brain_games_free_download.pdfIn PDF document text
    • https://nulasexojexof.weebly.com/uploads/1/3/4/0/134012614/539856.pdfIn PDF document text
    • http://copyrightnotices-form.com/72071744783jgrr5.pdfIn PDF document text
    • http://webpost.pro/designing_with_the_mind_in_mind3pw16.pdfIn PDF document text
    • https://cdn.sqhk.co/medujebukoma/cpibigl/disney_hotstar_login_limit.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_006_off00014fca.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x14FCA 30856 bytes
SHA-256: b2cb6ae404f3f2cdec85b27cebc9df1945ffafafc1543743d637303877cd067e
font_00_sfnt_off000109fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109FC 4312 bytes
SHA-256: 3fecd1cc4b59732258001b0f1484cd43b1a6b0c66be940898d4071326cf8373d
font_01_sfnt_off000118bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118BB 9032 bytes
SHA-256: b4c152d4d6725777fd974b37026cae9b21e5b293cd9891851b9071a9cc17b457
font_02_sfnt_off000137d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137D4 16860 bytes
SHA-256: f64f6527501f17eb948ae11324e6b5753f45f101fa40edcd6b69a3b452d1462f

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