Malicious PDF — malware analysis report

Static analysis result for SHA-256 c810677a073ea0dd…

MALICIOUS

PDF

69.9 KB Created: 2021-10-02 16:32:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: df324c271bfe68ad6bd5324180c4c323 SHA-1: c76cbb367c8ad68c88d8a2667e45105f6106994c SHA-256: c810677a073ea0dde1f6a44924a18e93b74655f88f2c5c2e680528ab4348f059
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristic firings suggest it functions as a link farm, directing users to numerous external URLs, one of which is associated with movie download lures. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the link farm suggest an attempt to redirect users to malicious sites, potentially for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://allytemp.ru/uplcv?utm_term=percy+jackson+movie+tamil+dubbed+free+download PDF link annotation
    • http://cctsw.net/whly/up_files/FCK/file/20210906_092842_150.pdfIn PDF document text
    • https://aurorabersinar2.com/contents/files/30370926732.pdfIn PDF document text
    • https://cpsguffanti.it/uploads/file/45114499922.pdfIn PDF document text
    • http://brmxn.com/userfiles/file/20210913182006_lnajxp.pdfIn PDF document text
    • http://2sisaccount.com/userfiles/files/sukesibigu.pdfIn PDF document text
    • http://bouwbedrijfansing.nl/userfiles/file/36712731737.pdfIn PDF document text
    • https://duvanco.be/docs/files/wasun.pdfIn PDF document text
    • http://nextlab-semi.com/files/fckeditor/file/fizanojawu.pdfIn PDF document text
    • http://hoitruyengiaocodocvietnam.com/uploads/image/files/12959210791.pdfIn PDF document text
    • https://www.bramfordgc.co.uk/ckfinder/userfiles/files/66621974543.pdfIn PDF document text
    • https://asoriofrio.org/ckfinder/userfiles/files/38398948533.pdfIn PDF document text
    • http://handgun.ee/media/file/79449310336.pdfIn PDF document text
    • http://studiotecnicodambra.eu/userfiles/files/76354214080.pdfIn PDF document text
    • https://2-view.org/home/view/public_html/ckfinder/userfiles/files/77516793806.pdfIn PDF document text
    • https://cjsc.se/ckfinder/userfiles/files/28851670374.pdfIn PDF document text
    • http://fairway.cc/images/blog/file/56806014985.pdfIn PDF document text
    • http://www.cpiequipos.com/assets/images/user_files/files/zofemajumepupufifisisef.pdfIn PDF document text
    • https://gamedunyasi.com/calisma2/files/uploads/bojavefoga.pdfIn PDF document text
    • https://pianotuningdarwin.com/userfiles/files/92294653077.pdfIn PDF document text
    • http://tantex.org/tantex/tantexuserfiles/file/8325973523.pdfIn PDF document text
    • http://energy-labels.nl/userfiles/file/82508745348.pdfIn PDF document text
    • https://pannonfinanz.eu/editor_up/92811915946.pdfIn PDF document text
    • http://maximaviajes.com/FCKfiles/file/73453220400.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_off0000ae1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE1A 11364 bytes
SHA-256: bb633ef235c09e748436ec564864ae3e4135e2ba37153ab50583d704f68d897e
font_01_sfnt_off0000c8e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8E8 16100 bytes
SHA-256: 7fcbdf2092b8a2226b1b3e631dddcdcac90e60408c27a16d9ac5013eac3a4b31
font_02_sfnt_off0000f1fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1FD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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