Malicious PDF — malware analysis report

Static analysis result for SHA-256 bcc6960cf5a91bf3…

MALICIOUS

PDF

84.5 KB Created: 2021-09-11 07:43:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: e02568a51bdb3b0ae8cc91e4486d2c52 SHA-1: 3fed25b0eb3a878fc465951884c78918f07f5aef SHA-256: bcc6960cf5a91bf30f0cc526b0dae9aff832f285dc2c6867cdb118516b76fa7e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various PDF files hosted on different domains, indicative of a link farm. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic confirms this behavior, suggesting a malicious intent to distribute further content or phish users. ClamAV detection and ML classification strongly support the malicious verdict.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 http://matchedtubes.de/userfiles/file/tuvikatemoxowaboza.pdf In PDF document text
    • http://iseveranscopy.com/upload/editor/file/voxarunav.pdfIn PDF document text
    • http://www.ezmoving.com/file/9471835685.pdfIn PDF document text
    • http://ingpiazza.eu/userfiles/files/46314732692.pdfIn PDF document text
    • https://ietc-oman.com/userfiles/files/finuvadisu.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/161393279942ae---zugupekebu.pdfIn PDF document text
    • https://larrialdiak.es/files/galeria/files/saputidusexegopisivanubu.pdfIn PDF document text
    • http://nikkenj.com/userfiles/file/59616276187.pdfIn PDF document text
    • http://shriramashramps.org/userfiles/file/pexaniboxok.pdfIn PDF document text
    • http://francescasciortino.it/userfiles/files/tujuganeruxizus.pdfIn PDF document text
    • http://nguyenthaotech.com/upload/files/tinekufenezoxarebeti.pdfIn PDF document text
    • https://fgcrubochi.com.ng/ckfinder/userfiles/files/42949464267.pdfIn PDF document text
    • http://vektorma.ru/uploads/assets/file/nagajurobijob.pdfIn PDF document text
    • http://www.serenissimaservizi.com/files/59419739550.pdfIn PDF document text
    • http://solarwindependence.com/ckfinder/userfiles/files/27493667317.pdfIn PDF document text
    • http://phonphangschool.com/upload/files/vasuxidaja.pdfIn PDF document text
    • http://vektor-bezpeki.com/userfiles/files/disakakirenabiruzipisima.pdfIn PDF document text
    • http://aj-freight.com/ckfinder/userfiles/files/10478595174.pdfIn PDF document text
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/efjuhv6an42ifbbccf5ceagth7/75841051180.pdfIn PDF document text
    • https://afra24.com/basefile/afra24/files/bukotonabakagujenajonamug.pdfIn PDF document text
    • http://fastcredit.ge/userfiles/file/gadefigewevedovororipiw.pdfIn PDF document text
    • http://asbufestival.com/uploads/FCK_files/file/90870163252.pdfIn PDF document text
    • http://dentalweek.eu/userfiles/files/zazoselila.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=dark+mode+extension+chrome+pcPDF link annotation
    • 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_off0000e402.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE402 18424 bytes
SHA-256: 33e4e35af93fbb7bb801bdf39d0ed60dd38e985fffbb856b12ca933f6710228d
font_01_sfnt_off0001137b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1137B 10928 bytes
SHA-256: 0c5807d925dcc59fb8612174f267de30518b75bd130e49a0bac9ecce85dc0e4c
font_02_sfnt_off00012ca4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CA4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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