Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9e4116d075430e2…

MALICIOUS

PDF

99.0 KB Created: 2021-05-02 16:40:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 12fc07ccb5a55eedfb375e3fbe1142e7 SHA-1: 2feaa57a9da706506d2dc91eca7a7a3a2d7dcaa7 SHA-256: c9e4116d075430e2fa50829846427a30ccdeccb6b62c212a700ba0262c82a64d
126 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The embedded URL 'https://jacksth.ru/strik?utm_term=is+fungal+bacterial+or+viral' suggests a phishing or scam attempt, aiming to redirect the user to a potentially harmful site. The PDF also contains numerous other URLs, many hosted on disposable domains, characteristic of link farms used to obscure malicious destinations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://jacksth.ru/strik?utm_term=is+fungal+bacterial+or+viral PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4481841/normal_6004fc45b0790.pdfIn PDF document text
    • http://kupidarinab.22web.org/41439164286.pdfIn PDF document text
    • http://mitutepoka.medianewsonline.com/career_options_after_12th_science_pcm_other_than_engineering.pdfIn PDF document text
    • http://bewilotaweje.mywebcommunity.org/85849536399.pdfIn PDF document text
    • http://soruboseveli.iblogger.org/33166862559.pdfIn PDF document text
    • http://bumululoru.mywebcommunity.org/maxiluruwedeneguruwogar.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413002/normal_5fcb58b63036a.pdfIn PDF document text
    • http://faxixovojaja.sportsontheweb.net/sapafufinimemovete.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413374/normal_5fe5619cc0459.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376854/normal_604aa58fce718.pdfIn PDF document text
    • http://japarof.mywebcommunity.org/tibaderemibokesepinamugi.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
    • http://zijedan.atwebpages.com/zemuwosutut.pdfIn PDF document text
    • http://xosofidevutora.epizy.com/autonomic_nervous_system_table.pdfIn PDF document text
    • https://s3.amazonaws.com/pivetuzadujo/60070425655.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6ee8c1b4-d9ba-41ad-b670-0579f5b2e176/rockwell_collins_proline_21_simulator.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bbe519d7-b668-4823-aed8-d620acaede6f/what_are_the_five_steps_in_resolving_conflict.pdfIn PDF document text
    • https://s3.amazonaws.com/simujix/dojizozomivibikoru.pdfIn PDF document text
    • https://s3.amazonaws.com/tetofamuxulil/vijitudavinesetar.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2dfd2672-b37d-4389-afce-38aa74934e69/what_is_colour_theory_in_art.pdfIn PDF document text
    • http://vozajaw.rf.gd/denivupefoke.pdfIn PDF document text
    • http://zugujegezamuto.epizy.com/85115149252.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a04c3a03-39e9-401f-b3ac-47b7bd9f23c8/the_raven_method_of_shifting_realities.pdfIn PDF document text
    • https://s3.amazonaws.com/robumuduluwise/xikapazu.pdfIn PDF document text
    • https://s3.amazonaws.com/wajibile/basic_c_programming_language_book.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012374.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12374 5068 bytes
SHA-256: a8e56049628eae837de66ed1fc7c22588765ab8ed91b524cb5780598348a9c1d
font_01_sfnt_off000134bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134BC 11304 bytes
SHA-256: a3e5e2d9eeb041868d387d2a3bef8ee4bbac5567a836b31e720e2b0fe5368533
font_02_sfnt_off00015b36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15B36 16092 bytes
SHA-256: 0e1ac90e4eaf8b1857a29461ee34136313bbbbe88c0ab68b543e42130314d642
font_03_sfnt_off00016ff3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16FF3 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2