Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ba7dc753ba3a649…

MALICIOUS

PDF

91.1 KB Created: 2021-09-12 19:17:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 121fa93a44bcbebf299ea3acf4466a60 SHA-1: b2da305d5233bcea01bd523831d030fcfe02ee6f SHA-256: 6ba7dc753ba3a649ea5c8cbcaf83524d3cad784caa44681ae87dfa5ad937eb0b
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 0.9982

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://pistant.ru/uplcv?utm_term=the+essential+guide+to+digital+signal+processing PDF link annotation
    • http://xn--80aagkbrca3apkgkee0a1bi.xn--p1ai/ckfinder/userfiles/files/vezezedadizomojemavav.pdfIn PDF document text
    • http://colleges-in-tamilnadu.com/FCKeditor/userfiles/file/dosilatoso.pdfIn PDF document text
    • http://fivelscope.net/fckimages/bojawefefuju.pdfIn PDF document text
    • http://belovosushi.ru/files/59918784125.pdfIn PDF document text
    • https://santa.sg/images/users/00000000/files/32037160118.pdfIn PDF document text
    • http://jarauwerdaenzn.nl/userfiles/file/83874617212.pdfIn PDF document text
    • http://xn--82cac8d3ajrc0gd0bo4a7nf3qg.com/userfiles/files/2159273619.pdfIn PDF document text
    • https://weekendtripskolkata.com/userfiles/file/36627921662.pdfIn PDF document text
    • http://koreabulk.net/userData/board/file/39447143276.pdfIn PDF document text
    • https://ipekyolumedya.com/resim_galeri/file/40937486872.pdfIn PDF document text
    • https://skopjemuzikon.pmgrecordings.com/ckfinder/userfiles/files/1377201107.pdfIn PDF document text
    • http://banhangcongnghe.com/upload/FCK/file/90962877302.pdfIn PDF document text
    • http://shesob.com/file/files/denexarakunovure.pdfIn PDF document text
    • http://fueandhair.com/userfiles/files/jifejebiloz.pdfIn PDF document text
    • http://www.alexgis.com/siteuploads/editorimg/file/wudapazorubegevufawor.pdfIn PDF document text
    • http://ckudzcssffhhj.handysociality.com/upload/files/sigolisoxetobituganu.pdfIn PDF document text
    • http://artattack-concerts.de/files/file/97646243829.pdfIn PDF document text
    • http://bettynblue.com/upload/fck_img/20210904/file/wumekumewaxalesolipewuru.pdfIn PDF document text
    • http://thucphamchucnangmy.vn/uploads/files/xamasomazuzafijodaxuxojon.pdfIn PDF document text
    • http://timeyear-v.com/userfiles/file/31534135437.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137f1b78141f---20465621624.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_off0000fefa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEFA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001170c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1170C 18012 bytes
SHA-256: 6a6a0f77e0c270dde171748578238d8c097a855da31853a6945c3779313a4416
font_02_sfnt_off000145e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x145E4 10856 bytes
SHA-256: c705c2b7dd2b29d9657c8a886321497270d159d1401c57cc7750be072acc202a

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