Malicious PDF — malware analysis report

Static analysis result for SHA-256 08d5f103b3526dc2…

MALICIOUS

PDF

73.9 KB Created: 2021-09-16 00:29:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: f576d61dcca64e880ad272603617612c SHA-1: c57b026b382f8c55d669c889f2800d58a6ec22f3 SHA-256: 08d5f103b3526dc29b6e14bb9c2d36945988aa553f211cd5b4e7b52b6ddf8a65
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a high number of external URIs, many of which point to disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is likely responsible for redirecting the user to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://equantumconsulting.com/files/files/25797642183.pdf In PDF document text
    • http://sbs-group.co/userfiles/files/bakupadiwoturokugiwaratem.pdfIn PDF document text
    • http://dajuicebarus.com/uploads/files/nitagonalawimowabi.pdfIn PDF document text
    • http://sonsuadogo.org/Images_upload/files/75305582991.pdfIn PDF document text
    • http://kondicionery-himki.ru/upload_picture/file/5847323194.pdfIn PDF document text
    • http://volkshilfe-vlbg.at/images/content/files/rezavimimiludafiw.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/tobiv.pdfIn PDF document text
    • https://alley.52886.tw/uploads/files/82482061474.pdfIn PDF document text
    • http://ckud.handysociality.com/upload/files/worogikum.pdfIn PDF document text
    • http://boxerdapolenta.com/cmsimple/images/file/nexujumujapajusuk.pdfIn PDF document text
    • https://www.colegiodomus.com.br/js/ckfinder/userfiles/files/gevajuzesonufuxaxekosol.pdfIn PDF document text
    • https://thefertilizerequipment.com/d/files/99637081702.pdfIn PDF document text
    • http://alconsprom.ru/ckfinder/userfiles/files/49848361674.pdfIn PDF document text
    • http://inistor.com/ufiles/files/91919896181.pdfIn PDF document text
    • https://nmg.lv/img/uploads/files/54395820659.pdfIn PDF document text
    • http://shinies.ru/img/lib/file/salovikudutaxuruvupi.pdfIn PDF document text
    • http://goldmustang.ru/files/files/gagowejokewo.pdfIn PDF document text
    • http://vagtteam.dk/userfiles/Files/rutusojigafabipukunan.pdfIn PDF document text
    • http://mtsp.by/userfiles/files/10428439392.pdfIn PDF document text
    • http://xn--80aafmoni2biho.xn--p1ai/admin/ckfinder/userfiles/files/keluxonijikamujunimej.pdfIn PDF document text
    • https://www.gurkhasfinance.com.np/ckfinder/userfiles/files/5294812090.pdfIn PDF document text
    • http://telek-trans.hu/editor_up/jeratafige.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=block+numbers+from+texting+androidPDF 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_off0000baf5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBAF5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d307.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD307 17544 bytes
SHA-256: bdb2cfe09c49b25b3b1ddd72e3dbf90f90ff94769086be6057ac7ea540d92da6
font_02_sfnt_off0000ffac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFAC 11304 bytes
SHA-256: 8acee766abc6d011dccd6d821009ba3c71f316270d9b634b9b232001ca5a482f

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