Malicious PDF — malware analysis report

Static analysis result for SHA-256 a286f9262e5df9ee…

MALICIOUS

PDF

81.8 KB Created: 2021-02-15 22:04:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 346bd72c807967eb157f4148f5e86891 SHA-1: 1361ef8f90cb2d290415445984305670f1227c8f SHA-256: a286f9262e5df9ee35dd719a5f49ed97e70aaa0ceaa38da21cb50bce9580376b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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=how+to+count+volume+of+cuboid PDF link annotation
    • http://instas.site/toeic_reading_practice_with_answers07y5z.pdfIn PDF document text
    • https://cdn.sqhk.co/kugefiruxat/jepnjia/tukovozoxijipifotemesa.pdfIn PDF document text
    • https://zitudoxe.weebly.com/uploads/1/3/1/4/131437236/melax.pdfIn PDF document text
    • https://wamogipoko.weebly.com/uploads/1/3/0/7/130739383/8bb8625b9.pdfIn PDF document text
    • https://zewadozodatigi.weebly.com/uploads/1/3/4/3/134337643/nagubu.pdfIn PDF document text
    • https://kikafizujugu.weebly.com/uploads/1/3/4/0/134012642/nulen.pdfIn PDF document text
    • https://cdn.sqhk.co/bomemenun/eSQmN6e/21877481086.pdfIn PDF document text
    • http://woradegasuma.iblogger.org/nh_t_icloud_v_iphone.pdfIn PDF document text
    • https://cdn.sqhk.co/dosakupu/6YIqGm0/84630931824.pdfIn PDF document text
    • https://cdn.sqhk.co/jesovolavig/hijLgjd/ringtones_download_apps_android.pdfIn PDF document text
    • https://wizawexixif.weebly.com/uploads/1/3/4/4/134472694/fuser.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
    • https://s3.amazonaws.com/bufexa/79265318188.pdfIn PDF document text
    • http://vofuwelezetez.rf.gd/esc_guideline_2019_dyslipidemia.pdfIn PDF document text
    • http://xuramilipadig.rf.gd/gonorrhea_management_guidelines.pdfIn PDF document text
    • http://vutaxinasiva.epizy.com/europe_trip_planner_template_excel.pdfIn PDF document text
    • https://s3.amazonaws.com/tutasujal/barrow_fc_ground_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/punagilelabon/pimemumawakitipidinixu.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e954.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE954 4816 bytes
SHA-256: 165a3ee4c0a5e96791cf5c9cdb0dd7a4b8d62e51e7536ef89ed924b286f92876
font_01_sfnt_off0000f9af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9AF 1576 bytes
SHA-256: 2ff6bea367f3d40d8dfb720514b19e3b4c6e7b8682b90f9613dff7d2a578cf5a
font_02_sfnt_off000101cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101CD 12388 bytes
SHA-256: b157f011a8568bfd649e64ae761ff4143a589cae41424809c5db6ed7b1c5ca2e
font_03_sfnt_off00012b35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B35 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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