Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b55d5c1c5829099…

MALICIOUS

PDF

158.4 KB Created: 2021-01-20 19:12:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 236b063178db4556bac582c663e57212 SHA-1: 9281ac255b8bbd759f86064d40f648e5f644f51c SHA-256: 4b55d5c1c5829099b7f3ecb2a9d1fabc491817422ce381a7bb8a55613b65d57f
146 Risk Score

Malware Insights

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

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier with high confidence. It contains numerous embedded URLs, many pointing to disposable domains or link farms, suggesting a phishing or malware distribution attempt. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically indicates a link farm on disposable hosting, reinforcing the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 6

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://trafftec.ru/123?utm_term=erectus+walks+among+us+wikipedia PDF link annotation
    • https://cdn.sqhk.co/vefapatape/qhcheig/pozomigoris.pdfIn PDF document text
    • https://cdn.sqhk.co/jalizovi/iijgjiy/dark_sword_2_mod_apk_latest_version.pdfIn PDF document text
    • https://cdn.sqhk.co/kusamika/BiiWrOR/mtn_momo_cameroon.pdfIn PDF document text
    • https://cdn.sqhk.co/gukitane/hoP7TBb/uc_browser_online_video_free_download_app.pdfIn PDF document text
    • https://biteledazuxol.weebly.com/uploads/1/3/4/3/134315761/vikaxaw-tubufoza-belubupeleritin.pdfIn PDF document text
    • https://vobasonuniba.weebly.com/uploads/1/3/4/6/134668907/nemoranamasev-genabewiwemaxil-moxibewadim-xinul.pdfIn PDF document text
    • https://wugeneziwepuzi.weebly.com/uploads/1/3/4/4/134494794/7b0f2afb74ff12.pdfIn PDF document text
    • https://cdn.sqhk.co/susotizakaxe/ciboHhb/notes_disappeared_from_iphone_xs.pdfIn PDF document text
    • https://xetetikagidol.weebly.com/uploads/1/3/5/3/135308020/6cb39789ca.pdfIn PDF document text
    • https://gatikewud.weebly.com/uploads/1/3/4/3/134382011/1732945.pdfIn PDF document text
    • https://cdn.sqhk.co/totuzilexif/ajbsGe2/47306178349.pdfIn PDF document text
    • https://girewatadetax.weebly.com/uploads/1/3/2/6/132681062/makojupir_wusojodojenej_welazobekog.pdfIn PDF document text
    • https://cdn.sqhk.co/totudavomud/YaPBt3t/gomilekamupuzorevinoladaz.pdfIn PDF document text
    • https://lusenivusimutom.weebly.com/uploads/1/3/4/8/134887898/tebawugebexoden.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fabonek.rf.gd/99170261200.pdfIn PDF document text
    • http://xazomagojuwa.epizy.com/guide_to_growing_orchids_at_home.pdfIn PDF document text
    • http://kazigolukujo.epizy.com/booklet_template_pages.pdfIn PDF document text
    • http://bigerubuseke.rf.gd/oxygenos_open_beta_android_10.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001febe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1FEBE 11464 bytes
SHA-256: 14e85f57cc219f8989a981cf0c6239c24555196d6536925c318009b483cb73e6
font_01_sfnt_off000223c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x223C9 5504 bytes
SHA-256: f540632d76179ba1ed7b6f1cdb003351d4845cdc1705d6fbc4a1d9346b278a88
font_02_sfnt_off0002367c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2367C 1716 bytes
SHA-256: b744d20329a21ba1921c870a4deaacb4064f710d75eb1a58e31c0067c31195cd
font_03_sfnt_off00023f22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x23F22 14236 bytes
SHA-256: ebb2f697aa5fbf252be440e798dc2aec1739167c83255055a4564ddfabcd4f78

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