Malicious PDF — malware analysis report

Static analysis result for SHA-256 13e454d612d8d383…

MALICIOUS

PDF

84.8 KB Created: 2021-05-18 08:50:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 9f1a5eaff171177fcbd735b3ed38e363 SHA-1: 2850415e565679ca2ae49352f2781fffa9ccb2ee SHA-256: 13e454d612d8d3834fccf25a700ef6f9df39c7b3c3bc376ad42e660151fa644b
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with a significant portion pointing to disposable hosting and redirectors, indicating a link farm or phishing operation. The ML classifier and ClamAV detection strongly suggest malicious intent, specifically identified as a phishing trojan. The presence of external URIs and link farm heuristics points towards the distribution of malicious content or phishing lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://jottigo.ru/strik?utm_term=why+students+should+wear+uniforms+persuasive+essay PDF link annotation
    • http://nutoretuz.22web.org/bozavisixe.pdfIn PDF document text
    • http://tevajevidiwa.22web.org/26962479457.pdfIn PDF document text
    • http://juwapes.22web.org/bufidazewovidil.pdfIn PDF document text
    • http://fatiberekizibu.iblogger.org/dorepowinojozuxavejenif.pdfIn PDF document text
    • http://kokusurajiguz.22web.org/zapf_calligraphic_801_bold_font_free.pdfIn PDF document text
    • http://lozebakumod.22web.org/bujavanewavode.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/02988fbe-816a-481a-967b-4f548d64a7c2/mosbys_nursing_drug_reference_free_download.pdfIn PDF document text
    • http://desibevazivoxan.rf.gd/blundstone_size_guide_uk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/14aa2148-1e79-47eb-8173-ca962fe6c682/the_lives_of_a_cell_notes_of_a_biology_watcher.pdfIn PDF document text
    • https://s3.amazonaws.com/getizar/bjcp_guidelines_wheat_beer.pdfIn PDF document text
    • http://sotilikesad.epizy.com/csep_guidelines_for_older_adults.pdfIn PDF document text
    • http://digodimak.rf.gd/rocketman_movie_script.pdfIn PDF document text
    • http://rawuvotatu.rf.gd/gcf_lcm_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/kabisebax/solasuxipolixusojanuf.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/88b639ce-f8b3-41b6-8a3d-7ffd4d3f5d1c/61993729111.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1fc5c87d-823e-481e-8d35-c0d57897ff85/57589441608.pdfIn PDF document text
    • https://s3.amazonaws.com/vukusa/faouzia_bad_dreams_piano_sheet_music.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c400501e-50b4-4557-b882-1bf95f28ae11/probability_theory_courant_lecture_notes.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_off00010df3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DF3 5548 bytes
SHA-256: 9fc67e2c324cd214b029859d7e9b0c088c724aadfc62048ff5345758038b77a1
font_01_sfnt_off000120c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120C6 10888 bytes
SHA-256: 2886bc5fbcaab5f90b64c88fb697841b22cd174f38a857f9031803abca39249b

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