Malicious PDF — malware analysis report

Static analysis result for SHA-256 70f1dc4dc6a3f596…

MALICIOUS

PDF

85.9 KB Created: 2021-09-16 23:11:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: a8d9008ffa03c9805aaf2a1b70b575fe SHA-1: 5afeddc5d97cba66431331a08643dfd4945b5a21 SHA-256: 70f1dc4dc6a3f59688247fc811e3021ec9097cba63e4e86aed84fc5ff05b4f74
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, and exhibits characteristics of a phishing lure. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' indicates the document likely instructs the user to open a password-protected archive, a common technique to bypass gateway security. While no scripts were directly extracted, the PDF structure and embedded URLs suggest an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://coffee33.ru/archive/file/76857881489.pdf In PDF document text
    • http://duplisite.com/userfiles/file/gikaweliviginax.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614032263df58---minapi.pdfIn PDF document text
    • http://yds-wcv.jp/free_images/files/bojenunosunabobilas.pdfIn PDF document text
    • http://gramercygrand.ru/files/file/67675286707.pdfIn PDF document text
    • http://boras-sjuharad.boj.se/uploads/userfiles/files/roludotigeb.pdfIn PDF document text
    • https://bibonatura.com/ckfinder/userfiles/files/lebuvefevejakono.pdfIn PDF document text
    • http://opgzvh.hr/upload/file/kukiwepokude.pdfIn PDF document text
    • https://intervalhousehamilton.org/ckfinder/userfiles/files/90366163286.pdfIn PDF document text
    • https://tepatsasaran.com/contents/files/xevaribumob.pdfIn PDF document text
    • http://www.santamyoga.be/images/file/93670484742.pdfIn PDF document text
    • http://safetyassessmentsolutions.co.uk/ckfinder/userfiles/files/46852924020.pdfIn PDF document text
    • http://xhzhengli.com/upload/pizegumiralariduzolise.pdfIn PDF document text
    • http://lotusburbank.com/uploads/files/tajasidexu.pdfIn PDF document text
    • http://gpshardorawal.com/hemkunt/userfiles/file/9204829213.pdfIn PDF document text
    • http://smingames.com/ckfinder/files/83003243695.pdfIn PDF document text
    • http://radis-rrl.ru/userfiles/image/49489520046.pdfIn PDF document text
    • http://chayka-svg.ru/files/82795663701.pdfIn PDF document text
    • http://citranco.com/users/files/segaraxega.pdfIn PDF document text
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/44264842304f6981ed482b2919ed1cce/nupezedusifes.pdfIn PDF document text
    • http://linhkienhunganh.vn/luutru/files/1770418372.pdfIn PDF document text
    • http://encino.kopanramen.com/uploads/files/20352369396.pdfIn PDF document text
    • https://nangluongvada.com/uploads/files/53987302303.pdfIn PDF document text
    • http://srcchaika.ru/files/uploads/files/40966342059.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=flutter+change+ios+versionPDF 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_off0000e92f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE92F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010146.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10146 10652 bytes
SHA-256: 306d33988fca83aa887033654d5bf33ba562780bb09996164fb2119c0c758784
font_02_sfnt_off0001199f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1199F 18444 bytes
SHA-256: 6797664aebbb40b785ad6062ae4c0d3999970cacb5f5e3a6be0ea67e60ceeb6b