Malicious PDF — malware analysis report

Static analysis result for SHA-256 fdbaf4120cd1b657…

MALICIOUS

PDF

68.9 KB Created: 2021-02-21 22:20:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 2328c4d117e051bd347b3a1f4a2cca30 SHA-1: 6fe7cdfa89566e64db22ec398721e5dec29cb149 SHA-256: fdbaf4120cd1b657c8243a9408059a3cf5f6670d4182d2f096d46cdeb409124f
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=john+deere+115+automatic+carburetor PDF link annotation
    • http://artemk.ru/android_chronometer_countdown_examplezdrzq.pdfIn PDF document text
    • http://idealslim-italiaofficial.site/accuracy_plus_reporting_servicesqhbe3.pdfIn PDF document text
    • http://luminar2-download.xyz/2016_happy_new_year_greetingsdpv35.pdfIn PDF document text
    • https://cdn.sqhk.co/sunawopi/vYhjjje/20667136233.pdfIn PDF document text
    • http://starconflict-game.ru/fotidaven8uwv.pdfIn PDF document text
    • https://cdn.sqhk.co/rabataxuvax/gcIifgh/cowboy_bebop_wallpaper_engine.pdfIn PDF document text
    • http://biomanix.best/libuxosefukomiy8e5b.pdfIn PDF document text
    • http://wogigafulokeme.22web.org/letterhead_template_word_doc.pdfIn PDF document text
    • http://kellys.space/cgegis_rules_1980_download6clcv.pdfIn PDF document text
    • http://specialsale.info/87971175754jvhba.pdfIn PDF document text
    • http://lolkek.xyz/snare_rudiments_sheet_musicrfc9a.pdfIn PDF document text
    • http://paktum.pro/ejercicios_de_problemas_de_ecuaciones_de_primer_grado_para_imprimirym6l5.pdfIn PDF document text
    • https://zemutixo.weebly.com/uploads/1/3/4/8/134865820/nogomivora.pdfIn PDF document text
    • https://bunupujitoj.weebly.com/uploads/1/3/4/0/134017728/rigirufeda-duzesosejex.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000d046.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD046 5272 bytes
SHA-256: d5ba2cbbe8d21dbe5534d149ccbdab8a4683e6037059d91e0866c904917276be
font_01_sfnt_off0000e20f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE20F 10836 bytes
SHA-256: 8fd83b3cea9c1b427b5e3aae0c4f4ea01ab46bf7272f919feb2655bd4bf17a85

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