Malicious PDF — malware analysis report

Static analysis result for SHA-256 670af5d20b62d1b6…

MALICIOUS

PDF

72.4 KB Created: 2021-09-21 21:53:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: a62d400771e2dd1927e83542d85147ec SHA-1: bd1dab8660bd5ca0fbf2c0e266069bcff1bd8163 SHA-256: 670af5d20b62d1b6bcb62a572edc100c200a10ae2ecef41f64fa2a05f4423e9c
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are hosted on disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The embedded JavaScript is a common technique for executing malicious code or redirecting users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 https://ww150005.linebot.net/upfile/files/20210920092527.pdf In PDF document text
    • http://speckrepej.com/upload/file/76495977948.pdfIn PDF document text
    • http://wowbond.com/upload/Fckeditor/file/79095687025.pdfIn PDF document text
    • http://cuboni.com/uploadfile/hong202109211500595287.pdfIn PDF document text
    • https://haisanquangninh.org/data/dulieu/files/tojegikafirinenonojumenon.pdfIn PDF document text
    • http://fszhenjia.com/upfolder/e/files/20210901102459.pdfIn PDF document text
    • https://inunekocp.jp/mailmagazine/upload/files/gedugo.pdfIn PDF document text
    • http://geobigoni.it/userfiles/files/33423115616.pdfIn PDF document text
    • http://liavanhaeringen.nl/userfiles/files/6727246919.pdfIn PDF document text
    • https://x-software.cz/data/file/65346937408.pdfIn PDF document text
    • https://corumosmanlimakina.com/js/ckfinder/userfiles/files/58995240422.pdfIn PDF document text
    • http://etabetasurvey.com/userfiles/files/pazopifage.pdfIn PDF document text
    • https://www.informacion-indoorclub.com/boletines/img/file/94223245724.pdfIn PDF document text
    • https://chennothinterios.com/uploads/file/75077636525.pdfIn PDF document text
    • https://ecoverservice.be/gallery/file/64787995536.pdfIn PDF document text
    • http://hnsunnyfood.com/d/files/72173788201.pdfIn PDF document text
    • http://csc021.com/userfiles/file/20210902142311_vmdngo.pdfIn PDF document text
    • http://camonetinternational.com/files/file/5431811266.pdfIn PDF document text
    • http://gevenschoenen.nl/ckfinder/userfiles/files/nerubewuxa.pdfIn PDF document text
    • http://teleserviciomalaga.com/ckfinder/userfiles/files/watabugifalepogid.pdfIn PDF document text
    • http://kbautotech.com/board/datafiles/imagefile/garadukegudukati.pdfIn PDF document text
    • http://sinostandards.net/upload/files/33605607970.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=rise+of+berk+mod+apk+free+shoppingPDF 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_off0000b9fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9FD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d214.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD214 11080 bytes
SHA-256: feda8e81483c0ac09c0c33b72f8353ce88aec11b317a958942f8383edaab85cd
font_02_sfnt_off0000eb3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB3F 15832 bytes
SHA-256: 99a1463c5c9421f3cab2a01f6641faf2b40f1f28ed3b8900e6c4fef906f378e4

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