Malicious PDF — malware analysis report

Static analysis result for SHA-256 bcd7ea71a856ca8c…

MALICIOUS

PDF

83.1 KB Created: 2021-09-18 01:24:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: f1c1d9b62deb746565783bcf933b95b6 SHA-1: b6a58a71798d48396a4a7446ed93575242a70537 SHA-256: bcd7ea71a856ca8c67464835580d9665cc98fe879a5c713d6e878a71b8c55606
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document exhibits characteristics of a phishing or spam campaign, indicated by the PDF_SEO_DISPOSABLE_LINK_FARM heuristic and the presence of numerous embedded URLs pointing to potentially malicious or disposable domains. The embedded JavaScript stream (PDF_JS) further suggests malicious intent, likely to execute further malicious actions or redirect the user. The ML classifier and ClamAV detection strongly support the malicious verdict.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://mexvp.com/ckfinder/userfiles/files/61360636724.pdf In PDF document text
    • https://dnm.tw/uploads/files/202109152131599237.pdfIn PDF document text
    • http://ingmontagna.com/userfiles/files/19424234269.pdfIn PDF document text
    • http://dayuntang.com/assets/uploads/ckedit/files/20210902053854.pdfIn PDF document text
    • https://pinkrali.com/calisma2/files/uploads/xixugebovagokubukujuxal.pdfIn PDF document text
    • https://leganordavigliana.it/uploads/file/20726085666.pdfIn PDF document text
    • http://teen.plovdivweek.com/js/ckfinder/userfiles/files/16755965763.pdfIn PDF document text
    • http://hexindechem.com/upload/files/pizogedab.pdfIn PDF document text
    • http://hyunshin.net/userfiles/file/kupokaribonixajefipaven.pdfIn PDF document text
    • http://exima.kr/userData/board/file/32196495737.pdfIn PDF document text
    • http://inciboya.com/resimler/site/files/nelunabegaki.pdfIn PDF document text
    • http://sanyosushiglendora.com/uploads/files/lifurerepobojoba.pdfIn PDF document text
    • http://rheumatology.institute/upload/content/file/jisegelaja.pdfIn PDF document text
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/5901df03000473ed37530f45e4fb0157/94058229653.pdfIn PDF document text
    • http://etkenkalip.com/files/wixaxakas.pdfIn PDF document text
    • https://samirkumarpaul.com/ckfinder/userfiles/files/91681539543.pdfIn PDF document text
    • http://prestopc.it/upload/file/jowatapumixivim.pdfIn PDF document text
    • https://rdsdealers.com/ckfinder/userfiles/files/wulola.pdfIn PDF document text
    • http://tcgardening.com/userfiles/file/2021090207282873499.pdfIn PDF document text
    • https://haltia.mx/sii/ckfinder/userfiles/files/poxatejivuwasa.pdfIn PDF document text
    • http://carzip.biz/files/uploads/files/87221902501.pdfIn PDF document text
    • http://zpkprzemysl.pl/ckfinder/userfiles/files/pujolelelativokiramibus.pdfIn PDF document text
    • http://hizirferforje.com/admin/fckeditor/editor/images/file/sopexadojukozozesibunozo.pdfIn PDF document text
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/eq059p3md8qttdrue0j48evvla/93024468221.pdfIn PDF document text
    • https://royal-art.pl/uploads/userfiles/files/53357270142.pdfIn PDF document text
    • https://maintogelonline2.bet/contents/files/xalapebeko.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=moto+one+power+latest+software+updatePDF 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_off0000dba1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBA1 19384 bytes
SHA-256: 9a07ce37f43d116d78d9d481ced6da8271243b109167b803b926a0c0e632b67b
font_01_sfnt_off00010da1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DA1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000125b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125B8 10580 bytes
SHA-256: 549b784f4f9fd59a86e58ab54a3cb0cee1678ccb43621df108aaab3b62517f05