Malicious PDF — malware analysis report

Static analysis result for SHA-256 1039a32500fd1943…

MALICIOUS

PDF

77.8 KB Created: 2021-04-08 07:37:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: e88ea30758c1f9895d1ef8aab9554d77 SHA-1: 5c8e5be145c4f9d6e555887e0b707f1ebb8537cc SHA-256: 1039a32500fd19438466d5cc470c206e63c243323683c3d5f92d6812ba59491e
126 Risk Score

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains multiple embedded URLs, with one specifically flagged as a link farm on disposable hosting, suggesting a phishing or redirection attempt. The PDF structure and embedded content, though partially obfuscated, point towards an attempt to deliver users to external sites for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://lozipotod.ru/strik?utm_term=what+is+myofascial+release+technique PDF link annotation
    • https://cdn.sqhk.co/nomuzali/gckghg4/art_of_war_sun_tzu_audiobook.pdfIn PDF document text
    • https://cdn.sqhk.co/govizanorev/lBjeEhh/tirejovak.pdfIn PDF document text
    • http://avtoshkola-region26.ru/what_is_chess960jykxv.pdfIn PDF document text
    • http://nakrutkavk.site/joduzulunafu9z0y3.pdfIn PDF document text
    • http://irbestate.ru/macbeth_act_5_scene_2_script4jfkv.pdfIn PDF document text
    • http://begemotiks.space/261336737264dbma.pdfIn PDF document text
    • https://cdn.sqhk.co/kivipemo/CBzRJjj/4831920716.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/jodabiladezot/best_iphone_spreadsheet_app_free.pdfIn PDF document text
    • http://bafowixo.rf.gd/67539313280.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/db2b828b-c220-4812-970b-d7244d0d1d6c/59402935378.pdfIn PDF document text
    • https://c63ca81c-6df4-4ec3-bc2e-8508f29a6879.filesusr.com/ugd/d48fe3_29cc4a5494704404a407efcf96485c73.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kagedatabujo/54907089784.pdfIn PDF document text
    • https://s3.amazonaws.com/jimugivos/walt_disney_world_park_map.pdfIn PDF document text
    • http://viwekamopib.rf.gd/mafuzuwaxobenidoja.pdfIn PDF document text
    • https://s3.amazonaws.com/mexavofezoxi/cost_of_living_index_world_bank.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4ff8bf9b-bd10-4b3d-9d20-032d07cb395c/que_tipos_de_sistemas_operativos_de_red_hay.pdfIn PDF document text
    • https://6a1e2a5f-c456-4288-b9d5-5378f87870fb.filesusr.com/ugd/076fac_547a00a771cc48738e454dbf1452c3f4.pdf?index=trueIn PDF document text
    • http://wajiletum.epizy.com/civil_service_reviewer_question_and_answer_2019.pdfIn PDF document text
    • https://s3.amazonaws.com/minaxigevani/horizontal_line_android_app.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dd3d3247-7f0a-44f5-8864-47ad1c289bf4/rebuta.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/705a0a28-b554-486e-84cb-47e166cef962/14723470565.pdfIn PDF document text
    • http://merizipu.rf.gd/24337171929.pdfIn PDF document text
    • https://e5720c39-3c1c-4a52-9be9-509675281b5a.filesusr.com/ugd/0010c8_3f9ca25260b0423691de71807fb65fdc.pdf?index=trueIn 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_off0000f198.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF198 5364 bytes
SHA-256: ab2cad7e0aa5e903f2d806e57407dac9c8b101ee24d94599fe939789d6efcee3
font_01_sfnt_off000103c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103C6 11008 bytes
SHA-256: 55daf4a9726c57560bb632520407d8966ab5016de41e39d2f2193638d18a1042

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