Malicious PDF — malware analysis report

Static analysis result for SHA-256 089ffc9d05599ea4…

MALICIOUS

PDF

82.3 KB Created: 2021-03-31 09:19:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 6af40e3e3cbd86a538f377af266e7166 SHA-1: ebed6e2a34b3be329311f2cf05fdab784d43825a SHA-256: 089ffc9d05599ea4ff46acbfd7cd09423a4b28c53a8622c7d3c43e6f315c4778
184 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links, with at least one identified as a malicious redirector. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, a tool often used to create malicious PDFs.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://crophysi.ru/award?keyword=prise+en+charge+de+l+infarctus+du+myocarde+pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4366009/normal_600b4b6a5b524.pdfIn PDF document text
    • http://kigalasabipigo.medianewsonline.com/62883005662.pdfIn PDF document text
    • http://ruxuzosok.mywebcommunity.org/eyelash_extension_aftercare_instructions.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413456/normal_5fe0457b23b37.pdfIn PDF document text
    • http://mobufuwiwid.medianewsonline.com/plagiarism_quiz_answer_key.pdfIn PDF document text
    • http://kulotufiw.mypressonline.com/article_370_in_english_download.pdfIn PDF document text
    • http://bozesedixek.mywebcommunity.org/bhajan_songs.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4469634/normal_5ff717fb98636.pdfIn PDF document text
    • http://dafagaketa.sportsontheweb.net/zenalaked.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408990/normal_604f7cf458d6d.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://98748e4b-3258-471a-903e-8ea98415cca0.filesusr.com/ugd/fd7405_249eb8ce0e17430181fb77a1d07b0e68.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/a30a79f0-0386-488b-9395-3a9d8de1fb46/how_to_hard_reset_kindle_4.pdfIn PDF document text
    • http://tuwutexo.onlinewebshop.net/10297764514.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5b6f8dc9-3366-432a-a3e8-cd8eed0a2acc/which_food_is_good_for_mental_health.pdfIn PDF document text
    • https://def26600-86c9-4442-a738-094ddf2992d1.filesusr.com/ugd/eb5a6a_ca0f7e3cefe44481bce9988bba9e31df.pdf?index=trueIn PDF document text
    • https://f1e11ea9-a931-46ad-af30-391325c877dd.filesusr.com/ugd/423518_97021e5fff0f4f769a70f3455aac67b8.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/1c3f073a-98b9-4288-9749-ec286d438075/fisher_price_playset.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/75dfc527-c352-4f32-b060-03d5ce37319d/what_happens_if_you_overeat_everyday.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/37b1a039-0f94-48c9-b92b-83e6b1f718a4/vopop.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_off0000f008.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF008 5552 bytes
SHA-256: f70624bd4fc73d7eda34c7864e9953432f24c5e36a3125a3d3db00fce9a618f1
font_01_sfnt_off000102ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102BA 13128 bytes
SHA-256: 6878f0c3103dd606b9316e10627eee257198ead5c1acd27617f84ffd2bb4fdb4
font_02_sfnt_off00012b8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B8F 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176