Malicious PDF — malware analysis report

Static analysis result for SHA-256 f080fb2b78fed6fb…

MALICIOUS

PDF

76.5 KB Created: 2021-09-27 10:37:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 6c2e80111935590c420d22e46955269d SHA-1: b0bf791fb5f70464e6cea548a796caf67049c3d9 SHA-256: f080fb2b78fed6fb16aea9419cf889c045a6414236c6b088be683dfad42c469e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by multiple heuristics, including a high-confidence ML classifier and ClamAV detection. It contains numerous embedded URLs pointing to potentially malicious or phishing sites, indicated by the PDF_SEO_DISPOSABLE_LINK_FARM heuristic. The presence of external URIs and the nature of the detected malware (Pdf.Phishing.Trojan) strongly suggest a phishing or credential harvesting attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://catamma.ru/uplcv?utm_term=the+forest+apk+android PDF link annotation
    • https://wroclaw-effatha.pl/grafiki/file/felagupujusorive.pdfIn PDF document text
    • http://veiligheidssloten.nl/ckfinder/userfiles/files/15099989073.pdfIn PDF document text
    • http://ieltsadd.ir/cache/fck_files/file/26946365287.pdfIn PDF document text
    • http://thechitay.com/uploads/userfiles/file/doves.pdfIn PDF document text
    • http://jayeonrak.com/upfile_editor/2021/files/lajuvutumixa.pdfIn PDF document text
    • http://naturalfurnish.com/userfiles/file/moribuvovi.pdfIn PDF document text
    • https://sibconsulting.com/contents/files/fafuku.pdfIn PDF document text
    • http://mastervin.ru/files/file/melotovasukolu.pdfIn PDF document text
    • http://insfilings.com/skyzone_classic/upload/files/lifanodefewurojemubapon.pdfIn PDF document text
    • http://mbeautyconcept.com/upload/content_images/file/videzifepusigadetudud.pdfIn PDF document text
    • http://synerfreight.com/syner_upload/images/files/65898221345.pdfIn PDF document text
    • https://numen-wow.com/userfiles/cloud/files/nojozuradamezukozuteli.pdfIn PDF document text
    • http://zae.me/datafiles/file/sopago.pdfIn PDF document text
    • http://autoscuolemontagna.it/userfiles/files/vavazikap.pdfIn PDF document text
    • http://ulleungroadtour.com/FileData/ckfinder/files/20210901_E57042B9B13C004B.pdfIn PDF document text
    • http://immobilier-valence-agen.com/userfiles/file/8249701063.pdfIn PDF document text
    • http://teknis.it/userfiles/files/21407171983.pdfIn PDF document text
    • http://futurepoolandspa.com/ckfinder/userfiles/files/2437086564.pdfIn PDF document text
    • http://edbiji.com/uploads/files/20210902033758_997295.pdfIn PDF document text
    • http://ageddfjtjgrade.pretty-match.com/upload/files/3599196669.pdfIn PDF document text
    • https://mantyobras.com/userfiles/file/99804975331.pdfIn PDF document text
    • https://dusunceokulu.net/resimler/files/8145995807.pdfIn PDF document text
    • http://smartvoicecom.com/userfiles/xidupoguwoxovagubix.pdfIn PDF document text
    • http://hoangle.vn/uploads/userfiles/file/23841086347.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_off0000c03f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC03F 10604 bytes
SHA-256: b744b14a2a4c88a810fa301b94162b6bd3f759810a0adbe7fc918b2944021500
font_01_sfnt_off0000d876.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD876 20456 bytes
SHA-256: c647cb4e615838219bcf65dc5cf0132c675a3bca84d80adcd97a62c00fd7edc9
font_02_sfnt_off00010c38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C38 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1