Malicious PDF — malware analysis report

Static analysis result for SHA-256 4638b911e523a077…

MALICIOUS

PDF

69.4 KB Created: 2021-09-24 19:56:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 8fe4327e82b158edde83fbece1996824 SHA-1: 8300ddc12cce362e1091904e90fca2bd6a9a60fd SHA-256: 4638b911e523a0775ef1ce41988dfb9732068a81ddeb795a12cfe6ad83f4b406
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many of which are hosted on disposable domains and utilize UTM parameters, indicating a link farm or phishing lure. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards it being used as a delivery mechanism for malicious content hosted on external URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://irlanc.ru/uplcv?utm_term=best+mkv+movies+download+sites PDF link annotation
    • https://clubkdo.fr/img/pics/files/31462017779.pdfIn PDF document text
    • http://seamacros.com/upload/file/rixobasugagusikazuzij.pdfIn PDF document text
    • https://slezanie.eu/userfiles/file/17093227578.pdfIn PDF document text
    • https://mogilew.ru/userfiles/file/sarizujobasipusi.pdfIn PDF document text
    • http://grafosaleservice.cz/images/fck_editor/file/99524856221.pdfIn PDF document text
    • http://myredm.ru/uploads/file/92161580237.pdfIn PDF document text
    • http://www.anjhimayath.com/upload/file/81616199796.pdfIn PDF document text
    • http://odpadykj.cz/UserFiles/File/19213872258.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613755d013b0a---pirini.pdfIn PDF document text
    • http://capthepcongtrinh.com/uploads/news/files/17874657848.pdfIn PDF document text
    • http://agriturismolionsfarm.it/userfiles/files/tipipome.pdfIn PDF document text
    • http://ajivikafinance.com/userfiles/file/74696200897.pdfIn PDF document text
    • http://lynxauto.ru/userfiles/file/limexaxulirunewizonimulas.pdfIn PDF document text
    • http://med-os.com/user_upload/file/juzusobovebojevi.pdfIn PDF document text
    • http://strahyi.ru/images/file/85426760358.pdfIn PDF document text
    • https://am-system.eu/ckfinder/userfiles/files/93617968122.pdfIn PDF document text
    • http://safarang.com/basefile/files/25448419581.pdfIn PDF document text
    • https://pcparts.fr/ckfinder/userfiles/files/49320754738.pdfIn PDF document text
    • http://jjsgreatescape.com/uploaded_files/userfiles/files/47691495829.pdfIn PDF document text
    • https://beldapin.com/calisma2/files/uploads/49250693664.pdfIn PDF document text
    • http://gpp300.fr/userfiles/file/pomutomamupuvewudazezeli.pdfIn PDF document text
    • https://somogyplusz.hu/files/zogig.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_off0000ad3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAD3F 10608 bytes
SHA-256: 28933776b9da6d93ba1ce6552346f83d0d07e5a4d60e5f9357dae595810dc3ea
font_01_sfnt_off0000c596.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC596 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000dda8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDA8 16588 bytes
SHA-256: c8ecab170c35c916d66e2fac88c4fd4d8bdb6db4d0d65cc5bce61f3145af5c82

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