Malicious PDF — malware analysis report

Static analysis result for SHA-256 a467c1f228b8a460…

MALICIOUS

PDF

72.4 KB Created: 2021-09-14 12:57:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 118a09c1d51602368e5679a6a8632ff6 SHA-1: 73f0c02f124a16b500a1f1d812957f88bfc270f6 SHA-256: a467c1f228b8a46052a457f7f6a78b825b1bd4d50e9977410bd9d658dbd7f776
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to various PDF files hosted on potentially disposable domains, indicating a link farm designed to obscure the ultimate destination. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to redirect users to malicious sites.

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 http://videotour24.com/data/fckupload/file/73680486487.pdf In PDF document text
    • http://aow.infogestnet.it/ckfinder/userfiles/files/88290805500.pdfIn PDF document text
    • https://locktactyuma.com/ckfinder/userfiles/files/gekifitufefosasoginufovi.pdfIn PDF document text
    • https://suthuytinh.com/app/webroot/uploads/files/85588906762.pdfIn PDF document text
    • http://klenderbio.com/upload/files/ruvami.pdfIn PDF document text
    • http://terfigyelokamera.info/files/file/jujupolon.pdfIn PDF document text
    • http://wacommerce.net/home/integrity/public_html/ckfinder/userfiles/files/nifidizewo.pdfIn PDF document text
    • http://robvancampen.nl/userfiles/file/14025276509.pdfIn PDF document text
    • http://hmed.vn/upload/files/55743009643.pdfIn PDF document text
    • http://bestbelly.org/content/files/files/7189368950.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c723be7117---pasolu.pdfIn PDF document text
    • http://devveb.net/userfiles/file/nenilesuzuluxebol.pdfIn PDF document text
    • http://siblom.ru/files/upload/file/volined.pdfIn PDF document text
    • https://kasihpaham.com/contents/files/zixemikiratitogoguka.pdfIn PDF document text
    • http://connectcontrol.net/files/userfiles/files/xevikeborodujobami.pdfIn PDF document text
    • https://tahitotfalu.hu/ckfinder/userfiles/files/76018284510.pdfIn PDF document text
    • http://www.barbazan-debat.fr/ckfinder/userfiles/files/radawi.pdfIn PDF document text
    • http://mwbright.com/upload_fck/file/2021-9-1/20210901213111559142.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1612f711a4d66e---tajenubiz.pdfIn PDF document text
    • http://dglytbt.com/upfolder/e/files/20210913161905.pdfIn PDF document text
    • https://pgp-puh.hr/fck_media/file/xadiwatumivatofitiwumufa.pdfIn PDF document text
    • http://pijntherapie.be/uploads/files/gevijegelom.pdfIn PDF document text
    • http://nhatnamvina.vn/rich_editor/file/26814845298.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=how+to+run+android+appPDF 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_off0000ba3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA3A 16640 bytes
SHA-256: 4cf96be68c6ade10daefe9c32ea2cdd7b6ea04e56e7edf85b607bbfd7c12b7d9
font_01_sfnt_off0000e548.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE548 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fd5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD5F 10216 bytes
SHA-256: f53704f89efff6633f46ab74b06c4a6566dd2e7fa051fadba56f7af1c0d7c040

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