Malicious PDF — malware analysis report

Static analysis result for SHA-256 a02c0259c23bae7c…

MALICIOUS

PDF

87.1 KB Created: 2021-09-21 04:56:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 3be2e20ea05ffaf25c1c444a49527f77 SHA-1: d0f2908f68697924cc3745b4b92e9609f53eeaeb SHA-256: a02c0259c23bae7c90d79302a6a325edfb2ede824b42ef51ebbc3fcf01e69631
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to disposable domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://laptopcuhaiphong.vn/upload/files/19621216893.pdf In PDF document text
    • http://happinessgown.com/upload/users/files/84866690817.pdfIn PDF document text
    • http://w3-japan.com/js/upload/files/54072766645.pdfIn PDF document text
    • http://say-international.eu/userfiles/file/70365906018.pdfIn PDF document text
    • http://vitanova-cattery.com/upload/file/zelurubozekukuvezefinem.pdfIn PDF document text
    • https://sabunwangi.com/contents/files/7453390279.pdfIn PDF document text
    • http://chipgene.com/image/files/20210909_071447.pdfIn PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ff83e35434---zutifewokerifokovizej.pdfIn PDF document text
    • https://nepalipublisher.com/ckfinder/userfiles/files/jutexarijosilazijefamabu.pdfIn PDF document text
    • https://robertbah.si/files/file/40253009406.pdfIn PDF document text
    • http://studiotecnicomartani.eu/userfiles/files/votoniwepubafuna.pdfIn PDF document text
    • http://rld-carbon.ru/file/lulimivumiwejor.pdfIn PDF document text
    • http://taigesw.com/upload/files/77547286694.pdfIn PDF document text
    • http://ephtour.com/FileData/ckfinder/files/20210913_6A34667A6BD4612F.pdfIn PDF document text
    • http://tvsatkrosno.pl/userfiles/file/popuputetuvavolodorafoz.pdfIn PDF document text
    • https://mobilpetrol.olajpark.hu/files/files/4710271660.pdfIn PDF document text
    • http://teusz.pl/UserFiles/file/438032952.pdfIn PDF document text
    • https://ksmt.edu.np/assets/ckfinder/userfiles/files/14473210288.pdfIn PDF document text
    • https://simondaulte.com/ckfinder/userfiles/files/kuzisomigedanonov.pdfIn PDF document text
    • http://flirtproducties.nl/ckfinder/userfiles/files/pasegidibolikaxe.pdfIn PDF document text
    • http://movietek.vn/hinh-anh/files/lumazugafezenizin.pdfIn PDF document text
    • https://mashtalkandil.com/userfiles/file/48170722346.pdfIn PDF document text
    • http://bulk-supplies.com/userfiles/files/pofividuzuwu.pdfIn PDF document text
    • http://longarmquiltingacadamy.com/fckeditor/userfiles/file/30175312509.pdfIn PDF document text
    • http://marta-galan.com/files/varios/file/xuxadixu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=stickman+army+team+battle+apkPDF 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_off0000ee7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE7B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010692.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10692 10668 bytes
SHA-256: 44edc606ec789307c6fdc7ba0d71795ee5cc7f175c1c05b60d2bc07e776c9f81
font_02_sfnt_off00011ecb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11ECB 18220 bytes
SHA-256: 417c61cf18fc496636af1f40efefc47c12563287bf4c91dfb89a10cd9b14cf31