Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ac4aae1333ca5c0…

MALICIOUS

PDF

80.0 KB Created: 2021-09-18 19:52:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 15e8b4dd70a53afad16d79588a3e3823 SHA-1: d813bc43a5d339acfaf50adae1f4670772df6b62 SHA-256: 4ac4aae1333ca5c06337a2d8bcf19c69b4561e9b87021d07b7092ee7f22e231c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to suspicious domains and are flagged as part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing sites or download further malware. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://eastmangroupllc.net/ckfinder/userfiles/files/tusatoketavig.pdf In PDF document text
    • http://yournamebadges.com/withyourdog/cms_uploads/file/58998387215.pdfIn PDF document text
    • http://sun-green.eu/ckfinder/userfiles/files/wivetarusi.pdfIn PDF document text
    • http://rfychina.com/upfiles/files/16312060342930.pdfIn PDF document text
    • https://aokman-drive.com/d/files/fijaxuluzanaxotitetafi.pdfIn PDF document text
    • http://dakhoanhanai.com/images/files/29633330110.pdfIn PDF document text
    • http://schule.havonix.com/ckfinder/userfiles/files/79192569366.pdfIn PDF document text
    • https://amt-alarmy.pl/userfiles/file/74400694019.pdfIn PDF document text
    • https://gonguyenkhoi.vn/upload/files/80079169103.pdfIn PDF document text
    • https://aletihad-group.com/userfiles/files/13156688783.pdfIn PDF document text
    • http://kingsfci.com/userfiles/file/78930427688.pdfIn PDF document text
    • http://qhchemicalsfeed.com/upload/files/peradizolaz.pdfIn PDF document text
    • https://ustunbilgisayar.com/userfiles/files/30605267968.pdfIn PDF document text
    • http://tentimesneedlehill.com/UPFILE/userfiles/files/68820722465.pdfIn PDF document text
    • https://korvioinfotech.com/ckfinder/userfiles/files/jadifizikatoweg.pdfIn PDF document text
    • http://labonguyenhoang.com/img-chamthi/files/vejadiborugadomebeduziza.pdfIn PDF document text
    • http://beauty214.com/uploads/files/202109180504133371.pdfIn PDF document text
    • http://tzoetemondje.be/uploads/files/91224061127.pdfIn PDF document text
    • http://myucpb.net/userfiles/file/molubabuvupiwodoz.pdfIn PDF document text
    • http://banglatalkies.com/dynamic-images/cms/file/10871752074.pdfIn PDF document text
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/q9bnpo19r4fq59uf8m2c8pjer7/31525995233.pdfIn PDF document text
    • http://hk-sai.com/ckfinder/userfiles/files/levozilujipadezorisej.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=gyroscope+sensor+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_off0000d01a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD01A 19312 bytes
SHA-256: 8283d1e7d4ff202bfc8e3556170d09addffeba68e126fdf0de368348fa17d3ca
font_01_sfnt_off00010306.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10306 10376 bytes
SHA-256: 2ecdddf1a38e6ee6dd6892dbf658cd1b08afb803d0d7457faaaa21a33b04dd0f
font_02_sfnt_off00011ab6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AB6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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