Malicious PDF — malware analysis report

Static analysis result for SHA-256 331ec757985e5fd9…

MALICIOUS

PDF

78.5 KB Created: 2021-03-28 12:23:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 7a21559a4663fde0c9c52d6aabb7b61c SHA-1: 8c65511a53e83c92e23af46c95f872f58ca6e1db SHA-256: 331ec757985e5fd979c170b2f928139f28eb1829fc59dc0bf43e98dd9886d1be
126 Risk Score

Malware Insights

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

This PDF document is classified as malicious by ML and ClamAV, indicating a phishing or trojan threat. It contains numerous embedded URLs, many of which point to disposable domains and are likely used to host or redirect to malicious payloads. The document body, though heavily obfuscated, suggests a lure related to Microsoft Dynamics 365 licensing, a common tactic for phishing campaigns.

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://nipisod.ru/strik?utm_term=microsoft+dynamics+365+licensing+guide+2020 PDF link annotation
    • https://cdn.sqhk.co/rekosiseweno/1Wojejb/35226892764.pdfIn PDF document text
    • http://ralugugifoxatir.scienceontheweb.net/genesujurisudab.pdfIn PDF document text
    • http://bewizasosu.sportsontheweb.net/is_dmf_a_polar_protic_solvent.pdfIn PDF document text
    • https://cdn.sqhk.co/voxedijudibo/icqifHX/nulonowebopevo.pdfIn PDF document text
    • https://cdn.sqhk.co/fupetabuwuf/jejX9CN/51086956218.pdfIn PDF document text
    • https://woxigixekamut.weebly.com/uploads/1/3/0/7/130739530/nawivuju-gevajazidula.pdfIn PDF document text
    • http://wugumonisukanib.sportsontheweb.net/bsc_magazine_august_2020.pdfIn PDF document text
    • http://prizinsta365.site/bio_coal_briquettes_project_reportoytq8.pdfIn PDF document text
    • http://hookup666.site/66690688840a4hpv.pdfIn PDF document text
    • http://impergamon.com/the_looting_machine_tom_burgisatt9c.pdfIn PDF document text
    • https://cdn.sqhk.co/lubometusoz/iihegjr/12075423671.pdfIn PDF document text
    • https://wuzipagaxu.weebly.com/uploads/1/3/0/7/130776492/f62be097.pdfIn PDF document text
    • http://waxedeb.getenjoyment.net/gutogujobojuwowizumuxem.pdfIn PDF document text
    • http://autobuff.xyz/californication_season_2_english_subtitles6t2dm.pdfIn PDF document text
    • http://shopmzm.site/the_innovators_dilemma_barnes_and_noble2w1vo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/vuxirefare/kopusa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c2d0fe57-bebc-45a3-b16a-4a07c00d8ebf/94464107242.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cf6cfba0-7321-4254-aee0-5b22d1347f78/what_is_the_most_important_equation_in_physics.pdfIn PDF document text
    • https://s3.amazonaws.com/pegozegi/anthem_medicare_advantage_ohio_prior_authorization_forms.pdfIn PDF document text
    • https://s3.amazonaws.com/fewifuwu/87152266795.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_off0000ef8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF8F 6164 bytes
SHA-256: 4419fd5902d0268a005f755664e91787e0a92c70ecb2ed96bf7620917f2aed5f
font_01_sfnt_off00010484.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10484 11080 bytes
SHA-256: 1c02db2a56e9f2fc7e34edbd35dd9c8e27b0690707a7ff34740065fc92c1642b

Open this report in the interactive analyzer, or submit your own file for analysis.