Malicious PDF — malware analysis report

Static analysis result for SHA-256 42249a1173c24eee…

MALICIOUS

PDF

76.5 KB Created: 2021-03-17 08:01:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: a194a26b40683104509714d7bf340995 SHA-1: 23e681b16249e87a9287727261f7c727603d15b7 SHA-256: 42249a1173c24eee53873ca50d60ce366cd75db793c9309d97c9163aec801e81
126 Risk Score
Tags
free-cdn-ebook-manual-lure

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 0.9997

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://bologen.ru/strik?utm_term=what+to+do+with+secret+seashells+link%2527s+awakening PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4392191/normal_60064deda9def.pdfIn PDF document text
    • http://masajsalonunuz.com/doc_to_converter_software_freeosiy3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382621/normal_6041b3dd3872c.pdfIn PDF document text
    • http://xexejevun.medianewsonline.com/bazuvenubi.pdfIn PDF document text
    • http://fedezin.scienceontheweb.net/chaconne_guitar.pdfIn PDF document text
    • http://gaydating.world/msi_h81m-p33_power_switchi6bs6.pdfIn PDF document text
    • http://trynutra.shop/managing_projects_with_gnu_make_3rd_editionmpau1.pdfIn PDF document text
    • http://twitter-center.com/cross_stitch_supplies_for_beginners2lwhi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408177/normal_6046b0a83411e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/e9c65e46-83d8-40f3-abf3-2fd32dae8226/amway_levels_income_2019.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/128f4814-b04b-4f70-91e0-7d52353810d1/galaxy_theatres_cannery.pdfIn PDF document text
    • https://s3.amazonaws.com/toliwudalamem/17485824069.pdfIn PDF document text
    • https://s3.amazonaws.com/vavejijitatofu/zobegapibaxetadunepi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/539a6675-97d8-45a8-b96a-5ca3337ba5a6/76026751676.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/15303e2e-009b-43f3-9744-214b6b829d04/74267694955.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0bf6bd50-76c3-4f1e-9f7e-2fc444afbdda/sat_math_level_2_score_distribution.pdfIn PDF document text
    • https://s3.amazonaws.com/sewamos/wipedoxizowidix.pdfIn PDF document text
    • https://s3.amazonaws.com/tasufagijaremo/tb_meningitis_guidelines.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/591034e4-7d8f-4bbe-ab35-d62c34175630/14978219730.pdfIn PDF document text
    • https://s3.amazonaws.com/vedexajawo/classical_guitar_sheet_music_notation.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2934152a-31be-4b7f-ad3f-227d1b907add/what_is_spindle_apparatus.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_off0000ed7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED7C 5404 bytes
SHA-256: 80bdfde80373f07688f8d4b7205a0ad5213c989ac43ceb134a730feb1aa615a2
font_01_sfnt_off0000fff6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFF6 10032 bytes
SHA-256: c715c5ccf83954d1a98bbb5fd720e8893f841e2cd0101b698c625dc1fb66677d

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