Malicious PDF — malware analysis report

Static analysis result for SHA-256 21c72b22a6b4d057…

MALICIOUS

PDF

78.2 KB Created: 2021-03-23 04:45:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 1a23a542ebd9e6018a44dfac6701109b SHA-1: 598a16ac483d95264fbd6c846a8189925a8e241d SHA-256: 21c72b22a6b4d057dbfe05c940b1f6e7da38f1cf89d55160f6469cba777dc330
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 0.9964

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://gimoguvi.ru/strik?utm_term=how+to+take+better+pictures+on+iphone+8 PDF link annotation
    • http://psychologyrelax.xyz/xidadadosumomazopatirus10yk7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455658/normal_6011e5795a8bb.pdfIn PDF document text
    • http://gojawufeki.getenjoyment.net/m-audio_fasttrack_pro_driver_mac_os_x_download.pdfIn PDF document text
    • http://scarcebook.com/lifestyle_free_mp3_downloadxu1jj.pdfIn PDF document text
    • http://nosilekexiwot.mywebcommunity.org/computer_engineering_notes.pdfIn PDF document text
    • http://ch-data-2a8fv9s.pw/teguzoe3f5r.pdfIn PDF document text
    • http://draiwenstore.online/widulilonowbuf3z.pdfIn PDF document text
    • http://veselutut.mywebcommunity.org/59712815543.pdfIn PDF document text
    • http://ig-mediateam.net/36998244300ucrx2.pdfIn PDF document text
    • http://sehq.xyz/ge_spectra_xl44_error_codesemc8k.pdfIn PDF document text
    • http://fojukivijivik.medianewsonline.com/what_is_the_best_online_yoga_teacher_training.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366360/normal_5fe5130012c2d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4456399/normal_5ffd03d0065fb.pdfIn PDF document text
    • http://deutschebank-meine.com/how_to_install_txv_valve5y9hi.pdfIn PDF document text
    • http://bevamifugidujew.scienceontheweb.net/aw139_rotorcraft_flight_manual.pdfIn PDF document text
    • http://repochka.site/kibebodemutitopajauhn2l.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467273/normal_602f92cc4b6c7.pdfIn PDF document text
    • http://dompodklyuch.com/ap_art_concentration_ideas_to_avoidwwaw8.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/deddd1cf-bfeb-410d-a94c-f98c0d98b9dc/yn_560_iii_review.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dc1435fb-3b99-41c6-afe0-c45118647b10/36337964467.pdfIn PDF document text
    • http://makakanow.onlinewebshop.net/61967298120.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/38a2230d-5b44-4a16-8da0-6050aafb52f9/zudot.pdfIn PDF document text
    • http://xakagigoneliv.myartsonline.com/pumabipaduvipezikapituv.pdfIn PDF document text
    • http://weparaxopulo.atwebpages.com/febad.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ecea1fa3-3dca-447e-9cd4-509a3c2f1007/iceberg_slim_pimp_francais.pdfIn PDF document text
    • http://sukokovevaz.atwebpages.com/atoms_and_molecules_class_9_questions_and_answers.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_off0000f426.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF426 5440 bytes
SHA-256: 3ceabd3f72dfa5a565903ecaf029bbc0e30cabca6ba545ced9d271b5e5b64332
font_01_sfnt_off000106ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106AB 10668 bytes
SHA-256: 6ed5ff289c5a975d6d9b453c7ba27a9d0c5e1d1ddfa3f65b5a3145dbab3db6d4

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