Malicious PDF — malware analysis report

Static analysis result for SHA-256 0bba5f3762976737…

MALICIOUS

PDF

71.4 KB Created: 2021-09-13 22:52:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-27
MD5: 6a8272f06662f7322b6f76319d674673 SHA-1: 98aa9af8bbc83ccdb92385166e277967a36d49dd SHA-256: 0bba5f3762976737611a0fd6fcdda52af3705918bee2b3c68faf2045b5a12991
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, as malicious and a phishing/link farm. It contains numerous external URIs pointing to disposable domains, suggesting an attempt to distribute malicious content or phish for credentials. Although no scripts were explicitly extracted, the PDF structure and URI patterns are indicative of a malicious document designed to redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://catamma.ru/uplcv?utm_term=starts+with+r+ends+with+e PDF link annotation
    • https://geneolock.com/locktactyuma/userfiles/file/6537483365.pdfIn PDF document text
    • http://cancunday.com/travela/img/files/10955470401.pdfIn PDF document text
    • http://www.childofafrica.org/media/userfiles/file/33796468916.pdfIn PDF document text
    • http://1-cities.com/blog_images/blog_/file/83825134000.pdfIn PDF document text
    • http://manu-transport.com/documents/file/49170918224.pdfIn PDF document text
    • http://ensky-chemical.com/upload/files/jevotonitolezuwizinev.pdfIn PDF document text
    • http://servmed.net/userfiles/file/26407537126.pdfIn PDF document text
    • http://efuturesthai.com/uploads/file/56653486719.pdfIn PDF document text
    • http://abwmountvernon.com/uploads/files/21354150296.pdfIn PDF document text
    • http://phdpecs.hu/userfiles/files/wixubuzumeluzapesix.pdfIn PDF document text
    • https://tcremich.lu/files/files/70383435499.pdfIn PDF document text
    • https://vibingvibes.com/userfiles/files/90787778052.pdfIn PDF document text
    • http://wahluenfty.com/userfiles/mimekokulanidufuw.pdfIn PDF document text
    • https://maxlinder.com/admin/assets/ckfinder/userfiles/files/bodevoluverekat.pdfIn PDF document text
    • http://cavusofis.com/images_upload/files/8369617622.pdfIn PDF document text
    • http://lawfirm.vn/MINH/user_files/file/kemigunaxevopumidu.pdfIn PDF document text
    • https://treasurehunterdetectors.solar-ovens.net/ckfinder/userfiles/files/27339024097.pdfIn PDF document text
    • https://aslimitada.com/userfiles/file/putuwew.pdfIn PDF document text
    • http://fskyok.com/uploadfile/files/jawene.pdfIn PDF document text
    • http://autosvilar.com/uploads/ckfinder/files/56355192632.pdfIn PDF document text
    • http://ecole.ru/text/images/file/76130159565.pdfIn PDF document text
    • http://ageddfjtj.pretty-match.com/upload/files/65000888358.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b58b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB58B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cda2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDA2 10340 bytes
SHA-256: 31d9503aed047600da3ffcaca8c32c04537ee2d1b047f36c0fa7fb8735a057cb
font_02_sfnt_off0000e4ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4ED 16660 bytes
SHA-256: 3145038cb7c41a24796c5aaaadbc50e3fa042e1cab69822bdfb539808827f186

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