Malicious PDF — malware analysis report

Static analysis result for SHA-256 e64fa3fa6e462b71…

MALICIOUS

PDF

85.1 KB Created: 2021-09-09 17:44:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: fa8d5aaf5adbd96b5ed91e1efd43e60f SHA-1: c4d7536d3497fc5cba703463f17709a0f559a532 SHA-256: e64fa3fa6e462b7149310eb56092ff0258084ae726657669b0163ccf2e8ac8cc
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by multiple heuristics, including ClamAV and an ML classifier, as malicious. It contains numerous external URIs and is identified as a link farm on disposable hosting, strongly suggesting a phishing or malware distribution attempt. The presence of embedded URLs and the nature of the heuristics indicate that the primary function is to redirect users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://krisoc.ru/uplcv?utm_term=boom+3+app+android PDF link annotation
    • https://theshamrockpublecco.it/file/lurupabu.pdfIn PDF document text
    • http://purel-biopharm.com/upload/files/89865512637.pdfIn PDF document text
    • https://everywheregenes.com/uploadfile/qu26_qu106_com/files/35132773545.pdfIn PDF document text
    • http://restaurant-lyons.fr/userfiles/file/54626723704.pdfIn PDF document text
    • http://patrick-jardinage.fr/ckfinder/userfiles/files/95547583563.pdfIn PDF document text
    • http://kantoromega.pl/userfiles/file/wobolivunu.pdfIn PDF document text
    • http://box8websites.com/ckfinder/userfiles/files/47429293396.pdfIn PDF document text
    • https://sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/16137f2254c720---denalomefejutubojumazozi.pdfIn PDF document text
    • https://tectrongim.com/uploads/file/31231674248.pdfIn PDF document text
    • http://royalwedding.jp/images/blog/file/67383719742.pdfIn PDF document text
    • https://warungmimpishio2.com/contents/files/livisiredasevarejurop.pdfIn PDF document text
    • https://viceda.com/userfiles/file/nowifizekotalonuxemodod.pdfIn PDF document text
    • https://pointwebhost.com/calisma2/files/uploads/41780193403.pdfIn PDF document text
    • https://abisspaandboutique.com/nbloom/fckuploads/file/59826679327.pdfIn PDF document text
    • http://xsjsbzrw.com/uploads/files/65307031121.pdfIn PDF document text
    • http://areawifi.com/DESARROLLO/userfiles/files/vonomuwadidote.pdfIn PDF document text
    • https://kaimano.it/file/kukokozujupida.pdfIn PDF document text
    • http://zespolbahamas.pl/zdjecia/file/guvidamenijifumiro.pdfIn PDF document text
    • http://daisytalavera.com/userfiles/files/lupigupejuwufafoxololix.pdfIn PDF document text
    • http://premiercontainerlines.com/media/ftp/file/74070192872.pdfIn PDF document text
    • http://tatnhapkhau.com/ckfinder/userfiles/files/84885095852.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/1612f4d52506da---11877026485.pdfIn PDF document text
    • http://cluster006.ovh.net/~greeters/be/ckfinder/userfiles/files/10043994899.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e865.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE865 10336 bytes
SHA-256: 45b83bd6e067ae474b5aa77e2cfdf0702e0296fde6e5b8614fd4d27a4031bb9a
font_01_sfnt_off0000ff95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF95 18056 bytes
SHA-256: b448a1d2e7857ec0bbb621250a0945a57193a51e466729dbcd7b00950ca446e6
font_02_sfnt_off00012e83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E83 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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