Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a73e88eb84608ee…

MALICIOUS

PDF

77.6 KB Created: 2021-04-16 21:45:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 43ee445852986f232ff4e4f657628a58 SHA-1: c88cc129415e37e954d53e8d74940ff8aedeabd6 SHA-256: 6a73e88eb84608eedab7a6d65b877746e3c022296cd3da92f7d5ae102d677e03
136 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document uses a lure related to a 'Davis drug guide app for android' and contains a high-severity heuristic firing for a redirector link. This link, https://nipisod.ru/strik?utm_term=davis+drug+guide+app+for+android, is designed to redirect users to potentially malicious content, likely a phishing attempt or malware download. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://nipisod.ru/strik?utm_term=davis+drug+guide+app+for+android PDF link annotation
    • https://cdn.sqhk.co/govibabika/jeSghyy/physiology_practical_ak_jain.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448985/normal_600c25dc2cdc2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4492575/normal_601845f7e7ac4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380211/normal_601bd450820b1.pdfIn PDF document text
    • http://zagavexakagin.mypressonline.com/mathematical_modelling_journals.pdfIn PDF document text
    • https://cdn.sqhk.co/jebozibiru/hhfje1b/34731810439.pdfIn PDF document text
    • https://cdn.sqhk.co/tizalenifo/dheLNij/zombie_shooting_games_hacked_unblocked.pdfIn PDF document text
    • https://cdn.sqhk.co/xarozowuzosa/syjhgfz/nfhs_basketball_timeout_rules.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411923/normal_602d9d9a3011e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/tevomenil/71534239391.pdfIn PDF document text
    • https://s3.amazonaws.com/zopenave/zeromejexerozifozanojemid.pdfIn PDF document text
    • https://s3.amazonaws.com/supefujoxopubu/autocad_3d_2016_free_full_version.pdfIn PDF document text
    • https://s3.amazonaws.com/wibedubosateg/anatomia_de_cadera_y_pelvis.pdfIn PDF document text
    • https://s3.amazonaws.com/batoragubukepo/novifov.pdfIn PDF document text
    • http://nifusotajezunur.atwebpages.com/jufagepegaxufo.pdfIn PDF document text
    • https://s3.amazonaws.com/doxifuba/rinnai_heater_error_code_12.pdfIn PDF document text
    • https://s3.amazonaws.com/sewamos/vmware_workstation_for_ubuntu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/277d8a2f-2c96-4c0e-845a-53c5083dd196/13607028178.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/65f6d735-8fea-4b62-a34a-2cc03cc402a1/ruger_mini_14_serial_numbers_to_avoid.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4bfbe17b-7b3e-4721-9d0d-a98541a01b52/fedidoju.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ca3750ca-4a2b-4610-8066-d1e1d7e944bf/dutuwifo.pdfIn PDF document text
    • https://s3.amazonaws.com/jikopot/worship_songs_lyrics.pdfIn PDF document text
    • https://s3.amazonaws.com/fapaga/35159532362.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_off0000f22a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF22A 5236 bytes
SHA-256: fddbc6981ab178fd8d113ed29af18c0d27292a90b3c201a632a451c9f10441fc
font_01_sfnt_off00010417.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10417 10864 bytes
SHA-256: 0142b2754dec285b18e2e93aa9ba43da926f63d9494a0b00e12fd41d477ac5e6

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