Malicious PDF — malware analysis report

Static analysis result for SHA-256 1fd43a75ced07cbb…

MALICIOUS

PDF

78.3 KB Created: 2021-02-28 20:49:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 369abee6b855e8c2f6eaa828435607e1 SHA-1: b16176ffc9768ed64937996833cf35181522a99e SHA-256: 1fd43a75ced07cbb0ee937adfe4f28e43028e49fed203b06e9aab11539d20d4a
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, and is flagged as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://lozipotod.ru/wix?keyword=words+start+c
    • http://digozulujatozuj.iblogger.org/call_blocker_app_free_for_android.pdf
    • http://remidisafenepi.22web.org/whos_the_strongest_person_in_one_punch_man.pdf
    • http://zutatowatipo.mywebcommunity.org/ley_1010_del_2006_acoso_laboral_en_colombia.pdf
    • https://cdn-cms.f-static.net/uploads/4410006/normal_600e8a6a93a3d.pdf
    • http://julivojurukumu.sportsontheweb.net/double_dabble_algorithm.pdf
    • http://bometaximom.scienceontheweb.net/vilejorivawubivosoxi.pdf
    • http://dalosizofovabes.medianewsonline.com/85536479890.pdf
    • http://navevukosuso.mypressonline.com/febabotoroxox.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://tojizevujodi.rf.gd/bahubali_2_full_movie_in_telugu.pdf
    • http://fizifar.epizy.com/deployment_checklist_template.pdf
    • http://wuvakamipur.rf.gd/97447198674.pdf
    • http://nisetekotixob.myartsonline.com/list_of_words_used_in_adverbs.pdf
    • http://jibaberumakome.rf.gd/robbery_bob_mod_apk_free.pdf
    • https://s3.amazonaws.com/jefazaxal/cuanto_mide_un_bebe_de_1_ao_y_4_meses.pdf
    • http://limoxukuk.atwebpages.com/3.5e_players_handbook.pdf
    • http://saxodanokijaj.atwebpages.com/81254319528.pdf
    • http://visifisaduz.rf.gd/nextbook_ares_8_software_update.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea94.bin
802a3ff0efc73be587880f634ea02a18c71a332ea8e1fa3a15aae7d8606d7221		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEA94 4432 bytes
font_01_sfnt_off0000f9ab.bin
1945f60bf7d4ea6f05e911d79f0578b1e82c3cef5f8928f79e5604df0c59e89f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF9AB 10720 bytes
font_02_sfnt_off00011e1c.bin
9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11E1C 4324 bytes

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