Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a6145374ed80e64…

MALICIOUS

PDF

72.1 KB Created: 2021-02-21 09:08:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 618bef81b708325775762a618eeafc45 SHA-1: d42a85489e534c590ef3a5351d14c465bbe99909 SHA-256: 5a6145374ed80e64dd3d4a688ce41142676c8352f6a4cf4141fd7a756658eec1
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 0.9998

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://druttle.ru/123?utm_term=schlage+keyless+door+lock+change+battery PDF link annotation
    • https://cdn.sqhk.co/sexasegavon/baXhNni/smallest_object_in_prop_hunt_fortnite.pdfIn PDF document text
    • http://ilkertr.shop/biogeochemical_cycles_project_answerszeu7s.pdfIn PDF document text
    • https://cdn.sqhk.co/pigexebobe/4b9gjfV/call_pakistan_direct.pdfIn PDF document text
    • http://gojepifega.22web.org/arcane_mage_pve_guide_8._0.pdfIn PDF document text
    • https://cdn.sqhk.co/medugagoviji/jt7hj8K/guide_mario_odyssey.pdfIn PDF document text
    • https://cdn.sqhk.co/seponidozit/bijeszX/lock_screen_widgets_iphone_app.pdfIn PDF document text
    • http://digitaloffice24.ru/aquifero_guarani_processo_de_formao8mp56.pdfIn PDF document text
    • http://dutov.org/base64_string_file_format027me.pdfIn PDF document text
    • http://tevoriveterusof.22web.org/siwizaru.pdfIn PDF document text
    • http://inostrana.com/ejercicios_de_subneteo_resueltosw2tkl.pdfIn PDF document text
    • https://cdn.sqhk.co/dibirolinu/q49yKhc/tikekobusut.pdfIn PDF document text
    • http://interstart.online/bsnl_plans_up_eastyb37g.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://badizep.epizy.com/crash_bandicoot_android_epsxe.pdfIn PDF document text
    • http://tonunipuwe.rf.gd/34120940780.pdfIn PDF document text
    • http://tipunif.epizy.com/chakravarthy_video_songs_kannada.pdfIn PDF document text
    • http://diwomikutaz.epizy.com/minecraft_free_windows_10_1._14.pdfIn PDF document text
    • http://rovetenexosa.rf.gd/33479842494.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cf38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF38 5352 bytes
SHA-256: 0c7a81f1451cdb9c515ba62dcf76b6661954a9ca2983a9c09ca22662326401e4
font_01_sfnt_off0000e158.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE158 10716 bytes
SHA-256: 0467f898d8310529f424bf787ffe12cda4e97f46d3b6e8aa27a52c525fe69298
font_02_sfnt_off000104fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104FB 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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