Malicious PDF — malware analysis report

Static analysis result for SHA-256 275ffae8aeae4dcc…

MALICIOUS

PDF

88.2 KB Created: 2021-03-27 14:10:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 1583203baf6feb8af2d98e551a972d7a SHA-1: ad8c8d22fff4217315628552b37a5a9559e83876 SHA-256: 275ffae8aeae4dccc885c176d14cf2b957bb9017785f5337077f1e57c58fb401
126 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, with one specifically pointing to 'mezovuduw.ru', a domain associated with phishing or malware distribution. The PDF structure and embedded links suggest an attempt to trick users into visiting a malicious site, likely for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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/strik?utm_term=cmos+digital+integrated+circuits+kang+ppt PDF link annotation
    • http://kanudivuvim.iblogger.org/xbox_one_wired_controller_cable_length.pdfIn PDF document text
    • http://vimoroketoburiv.22web.org/discrete_math_rosen_8th_edition.pdfIn PDF document text
    • http://besemafobekilir.22web.org/kuvotuxasigefowe.pdfIn PDF document text
    • http://buzofenag.22web.org/45880682796.pdfIn PDF document text
    • http://gelivebun.22web.org/what_are_all_the_lights_in_the_sky_tonight.pdfIn PDF document text
    • http://fontawesome.iohttp://fontawesome.io/license/In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://savekuf.rf.gd/88907442579.pdfIn PDF document text
    • http://botarukekim.rf.gd/27472486781.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/73e36431-129a-4a83-83e5-976fed60793d/78510084351.pdfIn PDF document text
    • https://d1159ab4-cbf5-42eb-897b-83a5e94cd7da.filesusr.com/ugd/536122_e79147b015b74e02bdd504326194d775.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/piwanisaj/52312824314.pdfIn PDF document text
    • https://69b3109a-7cce-4514-9193-d2106d9976ab.filesusr.com/ugd/3c2969_e2ffb9c8ab614b56a53b9bc2ab27613a.pdf?index=trueIn PDF document text
    • https://3a00e800-a8eb-44ae-aafc-ae9aecab8e06.filesusr.com/ugd/1715bf_bed0b287601f4d0d83cc9d2205d081ed.pdf?index=trueIn PDF document text
    • https://0306adf0-382e-42f1-903d-71c3961c97f1.filesusr.com/ugd/7ff653_88ab4432c7554785802811cabbd25993.pdf?index=trueIn PDF document text
    • http://gujemewemavud.rf.gd/zabepov.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f2dfa483-9d3a-492b-941c-e04216c33eb8/jaxabazituniketikedi.pdfIn PDF document text
    • http://zuzinaxawalodi.epizy.com/vorepi.pdfIn PDF document text
    • https://s3.amazonaws.com/baposivarabuj/debevolepazovogarasewire.pdfIn PDF document text
    • http://ganusigesu.rf.gd/tujojagozo.pdfIn PDF document text
    • https://s3.amazonaws.com/xufaxoferugod/interview_questions_and_answers_for_freshers_c.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/35c36d9f-d786-4187-8637-acfcd20ae29e/niv_life_application_study_bible_large_print.pdfIn PDF document text
    • https://53002a68-e35f-4167-ac88-1ab9777d7e72.filesusr.com/ugd/f5bc2a_78d5867fc89b4ca18d4dd81396a8cd50.pdf?index=trueIn PDF document text
    • http://dedetepejoxele.epizy.com/what_are_the_post_office_hours_of_operation.pdfIn PDF document text
    • http://midejoxujonaler.rf.gd/13579005160.pdfIn PDF document text
    • https://s3.amazonaws.com/baxekojojexusol/fozezalira.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a54357a3-1ffc-4026-8e1e-aac5ab8bfb84/jatigenapagomibogeliri.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_off00010a3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A3F 3760 bytes
SHA-256: 68c7ed311baa38756d20348df8c8ab9025b6acd064d16325f9950ee6a6ed02f4
font_01_sfnt_off0001188d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1188D 5360 bytes
SHA-256: 184f63c82c92c7dc440c91b6f9519021c9566430fe5fe9c74d1725a0fe5fac23
font_02_sfnt_off00012ab2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AB2 11140 bytes
SHA-256: 40004de634002109d4d3ddd81cfdb72b5af6bbe356b034bf99ddbd022edce8ab