Malicious PDF — malware analysis report

Static analysis result for SHA-256 48a89fe0a29c0778…

MALICIOUS

PDF

82.2 KB Created: 2021-09-13 02:02:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 81739f60d52978db2ab234da4fe22e44 SHA-1: 0eece28030abc9d92a99b56f508b120faa8d3623 SHA-256: 48a89fe0a29c07785bf5044d0eacbf05c0252092993bf137de16a47ad6f118d1
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://cructi.ru/uplcv?utm_term=run+1+unblocked+cool+math PDF link annotation
    • http://stadion-zarya.ru/ckfinder/userfiles/files/31471613641.pdfIn PDF document text
    • http://yournamebadges.com/withyourdog/cms_uploads/file/fajov.pdfIn PDF document text
    • http://abwingsva.com/uploads/files/vidotuf.pdfIn PDF document text
    • http://hakanhurdacilik.com/userfiles/file/79739463820.pdfIn PDF document text
    • https://ichapps.com/ichapps/ckeditor-ckfinder-integration/uploads/files/27643683953.pdfIn PDF document text
    • http://iact2001.com/userData/board/file/42578299932.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/wifufiju.pdfIn PDF document text
    • http://form4concrete.ru/pics/cont/file/lejiv.pdfIn PDF document text
    • https://houstoncoinshow.org/FCKeditor/file/53182126427.pdfIn PDF document text
    • https://ncsccalgary.com/userfiles/files/91946407269.pdfIn PDF document text
    • https://tdemo.order-pro.com/ckfinder/userfiles/files/suleka.pdfIn PDF document text
    • https://bio86.net/userfiles/fichiers/66891284518.pdfIn PDF document text
    • https://signatureshreyas.in/userfiles/file/67539163798.pdfIn PDF document text
    • http://kelvista.lt/images/files/sebodasozitinamumeveze.pdfIn PDF document text
    • http://erpos.sk/data/files/dojis.pdfIn PDF document text
    • http://airsoft1.ro/files/file/90458717693.pdfIn PDF document text
    • http://orthodoxvaidikasanghom.org/userfiles/file/kuxirifozifu.pdfIn PDF document text
    • http://gorisum.net/fckeditor/upload_file/file/lajubikap.pdfIn PDF document text
    • http://architettipassarinmarzotto.com/userfiles/files/96805060147.pdfIn PDF document text
    • http://kystar.net/filespath/files/20210911192605.pdfIn PDF document text
    • https://anukulagrotech.com/ci/userfiles/files/sobuwemisoguxorobegisex.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/82611173689.pdfIn PDF document text
    • http://www.dkmodels.net/ckfinder/userfiles/files/vokawab.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_off0000de7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE7B 10704 bytes
SHA-256: c9c740890fd50c13be494894a8ee8b42fe8e41080ba13fbc751e40782906721c
font_01_sfnt_off0000f6ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6EC 17204 bytes
SHA-256: 3d9d2037c30452df32e6f55d662a8086f198887b77baa806b74baf1f3c20244d
font_02_sfnt_off000123b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123B0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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