Malicious PDF — malware analysis report

Static analysis result for SHA-256 e43dee322913131e…

MALICIOUS

PDF

74.6 KB Created: 2021-06-11 06:04:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: d329bee24abc2ef56371f1bd890e554f SHA-1: e7a13813885d545d19b4b4526e24aa795ecfdd7c SHA-256: e43dee322913131ea2b65943274a0e6f83d2c3818a99b719544c62ea96d62898
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://wastran.ru/pbw?utm_term=fnaf+2+apk+full+game PDF link annotation
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://rukuvekuke.pbworks.com/f/reddy_and_reddy_agronomy_book_download.pdfIn PDF document text
    • http://risoxef.pbworks.com/f/gazetted_officer_certificate_for_aadhaar_card.pdfIn PDF document text
    • http://fuvulokaxeka.pbworks.com/f/product_key_for_windows_10_pro_for_free.pdfIn PDF document text
    • http://togusan.pbworks.com/f/jomumozevid.pdfIn PDF document text
    • http://gatasulupu.pbworks.com/f/pifevanukumenezuxoli.pdfIn PDF document text
    • http://laxaxufudej.pbworks.com/f/how_do_you_write_a_cover_letter_for_an_accountant.pdfIn PDF document text
    • http://giwupiraride.pbworks.com/f/how_to_write_a_script_for_commercial.pdfIn PDF document text
    • http://zusemivak.pbworks.com/w/file/fetch/144588993/89938628718.pdfIn PDF document text
    • http://risuxujuvu.pbworks.com/w/file/fetch/144517761/ccna_chapter_8_quiz_answers.pdfIn PDF document text
    • http://kenoxipej.pbworks.com/w/file/fetch/145084578/4182612303.pdfIn PDF document text
    • http://tanoroxamo.pbworks.com/f/the_encyclopedia_of_ancient_egypt_helen_strudwick.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/42959be9-5dd6-49cd-a0f9-cb2e2fc6269b/the_ugliest_girl_in_the_world_picture.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c3035874-0572-4ce6-8bae-cf5f3808d123/fotiwanudakore.pdfIn PDF document text
    • http://nitezug.pbworks.com/f/60206351293.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/70f25fac-0baf-4f75-9b59-210907e1ab67/rolasesakalerofikasitiju.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/439e3978-f41c-46ba-93ae-69d25abd588b/what_is_business_mediation.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_off0000e56a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE56A 5100 bytes
SHA-256: ccd811cfa259c4e08a24eef41d34b4eecb7262956af52f3c364e79efa3620a46
font_01_sfnt_off0000f6c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6C7 11896 bytes
SHA-256: f18b1a4f235b71fce112cd43a121d113c4cdba61a71803c338e96096d0ef0502