Malicious PDF — malware analysis report

Static analysis result for SHA-256 927ee07d88cb8fa9…

MALICIOUS

PDF

81.7 KB Created: 2021-04-04 07:17:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 2188a15f4607fc7f4211fdcea4ba6066 SHA-1: 79fa8d5d74327d438cf4ce0dace7b4aec44ca983 SHA-256: 927ee07d88cb8fa9592e606e817c86624268376ab26b39ccef8f1882089f14a0
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 an embedded URI pointing to a suspicious domain, mezovuduw.ru, which is likely used to host a malicious payload or redirect to a phishing site. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, a tool sometimes used to create malicious PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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/wix?keyword=bit+heroes+mod+apk+revdl PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4454965/normal_6035e9e6495e5.pdfIn PDF document text
    • http://gufutaca6.xyz/27691228494c7bxe.pdfIn PDF document text
    • http://questotzvezd.space/adobe_indesign_newspaper_templates0o4z6.pdfIn PDF document text
    • https://cdn.sqhk.co/lazemowul/apDO9ri/origami_flower_bowl_tutorial.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369935/normal_5fccfc67b7608.pdfIn PDF document text
    • http://aicberg.net/toshiba_canvio_slim_1tb_slv_ekstern_harddisk3mgpz.pdfIn PDF document text
    • https://cdn.sqhk.co/noxivudeva/hdgjDgc/bedupasupirugomaduvi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4386073/normal_6006e53d6ac77.pdfIn PDF document text
    • http://astrohelp.space/talend_big_data_tutorialud0xm.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419847/normal_605142509dac3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4479905/normal_5ff8482c243eb.pdfIn PDF document text
    • https://cdn.sqhk.co/mevazasid/chihiMt/learn_to_speak_british_english_free_online.pdfIn PDF document text
    • http://silver35.ru/25075947413wbhq8.pdfIn PDF document text
    • https://cdn.sqhk.co/kojetozativ/gXgfUgf/doubletree_hilton_hotel_ocean_city_md.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
    • https://s3.amazonaws.com/xukanomarexumu/febugawasigegabaxujiwed.pdfIn PDF document text
    • https://s3.amazonaws.com/fosalizuzu/macro_code_to_compare_two_excel_sheets.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3083b805-9dc8-45ee-8db1-ee7190cf8e49/brand_smart_premium_outlet_centre_hours.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ab0de6f4-5131-4bed-baa8-ae3d28a545c9/nuxufoxopezositep.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/83008816-ebeb-4534-a70f-ce5e72abaa97/69416019307.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/afe7d5a3-8e58-441c-8e9e-f86cb3551323/wisane.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f4f17201-a727-4520-9d8e-7843a1cb2610/kakefabamejesizit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e3195895-d6c4-44e8-a635-f778a350ef5a/what_rhetorical_features_are_used_in_the_preamble.pdfIn PDF document text
    • https://s3.amazonaws.com/jivagajamav/opposites_worksheets_for_grade_1.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/832f76b9-b14c-48be-9e2f-a8365e55658a/will_usps_deliver_on_sunday.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/74cea2ea-349c-4355-8a7b-b5609428a68a/audacity_tutorial_music_editing.pdfIn PDF document text
    • https://s3.amazonaws.com/dewazewokib/16838682797.pdfIn PDF document text
    • https://s3.amazonaws.com/bisegilupuf/contraception_guidelines_nz.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_off0000f168.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF168 5052 bytes
SHA-256: 636d937bbd669163a43b7867be70d44bfa357d5ae895851815f37ca33baf2994
font_01_sfnt_off00010298.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10298 11476 bytes
SHA-256: 7bf92ded4a9401ca06b6095959b9645e6bdd90cfca55329513d5e643c2fbf3e9
font_02_sfnt_off000129ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129BA 4324 bytes
SHA-256: 7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71