Malicious PDF — malware analysis report

Static analysis result for SHA-256 4222ad233a8226e8…

MALICIOUS

PDF

81.6 KB Created: 2021-02-20 12:50:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: c8604cf798930780c1c9befed0a73f4e SHA-1: 61c0d3d85a95373b5778cbf7ced57c9c3fa94015 SHA-256: 4222ad233a8226e80f967f58dd245010a958dc11a7d3e5879159922448bc0b2b
126 Risk Score

Malware Insights

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

The sample was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, with at least one pointing to a suspicious domain (`druttle.ru`) and another to a link farm on disposable hosting (`nixejawoxakubi.22web.org`). The presence of these links suggests the document is designed to redirect users to malicious sites, likely for phishing or to download further malware. No scripts were extracted, but the PDF structure and embedded URLs are strong indicators of malicious activity.

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://druttle.ru/strik?utm_term=crusader+kings+2 PDF link annotation
    • http://nixejawoxakubi.22web.org/my_passport_ultra_2tb_review.pdfIn PDF document text
    • https://varijamali.weebly.com/uploads/1/3/1/8/131856150/podusoda.pdfIn PDF document text
    • http://potusowo.22web.org/89153881091.pdfIn PDF document text
    • https://cdn.sqhk.co/datimemovuko/CBsFoij/paint_drop_game.pdfIn PDF document text
    • https://xikubafol.weebly.com/uploads/1/3/4/6/134607040/jesuga_mimidipeku.pdfIn PDF document text
    • https://jerefukixuludew.weebly.com/uploads/1/3/4/6/134686450/sodalinowitun.pdfIn PDF document text
    • https://cdn.sqhk.co/nufesewepi/ghiijd9/modern_art_sculpture_buy_online_pickup_in_store.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4407084/normal_5feb21b684e78.pdfIn PDF document text
    • https://cdn.sqhk.co/vaxarogajib/gfgcTbi/gixepemenuradisifamivabuz.pdfIn PDF document text
    • https://lisiruzefixa.weebly.com/uploads/1/3/4/4/134495270/3358972a8102ee.pdfIn PDF document text
    • http://jijagigipijum.iblogger.org/tumiziguxagilu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://litufowanukoro.epizy.com/subtenant_contract_template_uk.pdfIn PDF document text
    • https://s3.amazonaws.com/sakaburepagase/38485802373.pdfIn PDF document text
    • http://lumaradidufil.epizy.com/electro_house_music_2018.pdfIn PDF document text
    • https://s3.amazonaws.com/godewumazek/15942093776.pdfIn PDF document text
    • http://rupufunolodul.rf.gd/anganwadi_online_form_uttar_pradesh_2019.pdfIn PDF document text
    • https://s3.amazonaws.com/vexeliku/54339569773.pdfIn PDF document text
    • http://texokobatogu.epizy.com/sutejanipe.pdfIn PDF document text
    • https://s3.amazonaws.com/purixifusipelid/92166289341.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000102af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102AF 5064 bytes
SHA-256: 390dc5a151f33fdb5b631cfdb6fb4bded46a5e0ecef13c5335e8f57d2eeb3018
font_01_sfnt_off000113fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113FB 10952 bytes
SHA-256: bc055c5d844ab655ec2bbf27d8c57eddd1f4600661fed804b3a1c7c83d0a9b3f

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