Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f1b215ee754cf51…

MALICIOUS

PDF

81.6 KB Created: 2021-09-11 11:02:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 35584a0a4a4343539bc64fc842f9205b SHA-1: 8046dab6367db73c476f43775745406d6eb1fd8f SHA-256: 6f1b215ee754cf51a51ed5703a08a5d7564efa74c2f003e7c6e243c11014720d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is designed to host numerous links on disposable domains, a common tactic for phishing or distributing further malware. The embedded URLs, despite some being marked benign, point towards a network of potentially malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

Heuristics 5

  • 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.
  • 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 http://bulmarconsult.com/files/mukajedubogebajapexiborax.pdf In PDF document text
    • http://venusland.vn/app/webroot/img/files/misomin.pdfIn PDF document text
    • http://diplomat2014.ru/ckfinder/userfiles/files/54924562633.pdfIn PDF document text
    • http://energcomb.net/cms_enercomb/sgi_userfiles/userfiles/files/seleparagajik.pdfIn PDF document text
    • https://afgventuregroup.com/cfiles/file/rixumozadamutunego.pdfIn PDF document text
    • http://sinostandards.net/upload/files/4104648665.pdfIn PDF document text
    • http://susasoft.com/upload/userfiles/files/dajomaxukegogi.pdfIn PDF document text
    • https://imotrading.com/images/userfiles/revawolib.pdfIn PDF document text
    • http://stellarvvv.ru/ckfinder/userfiles/files/83163313265.pdfIn PDF document text
    • http://abarappresentanze.it/userfiles/files/ketozobukuvalabepodo.pdfIn PDF document text
    • https://jin-ji.com/upload/files/zomibasupob.pdfIn PDF document text
    • https://augsburger-dartliga.de/uploads/file/75061118049.pdfIn PDF document text
    • http://edu-soft.ru/site/htmlimages/file/guxufinuvawago.pdfIn PDF document text
    • http://beccaro.it/userfiles/files/lemovavikizudobotega.pdfIn PDF document text
    • https://sammycar.ch/sammy/sites/default/sammyfiles/newsletterfile/22336214515.pdfIn PDF document text
    • https://beta.nhatthiengroup.com/files/uploaded/files/38862018217.pdfIn PDF document text
    • http://novena99.com/uploads/files/202109080452559609.pdfIn PDF document text
    • http://aviatechinform.ru/sadm_files/56546737409.pdfIn PDF document text
    • http://asea-admin.com/_userfiles/file/20210907115126.pdfIn PDF document text
    • http://gachbinhduong.com/upload/file/repofe.pdfIn PDF document text
    • http://elektromig.pl/userfiles/file/buruku.pdfIn PDF document text
    • http://tobn56.com/UpFiles/file/17570413075.pdfIn PDF document text
    • http://mxag.com/upload/browse/file/87891935212.pdfIn PDF document text
    • http://prestopc.it/upload/file/zovasabirakowosunipozupol.pdfIn PDF document text
    • http://tayles.com/uploaded/jojezirerexexodufuj.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/16135733491c3e---vuwizawikir.pdfIn PDF document text
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/3412dca531ff8706cd6d604fef23cfb4/fuvojijagogadesigoxekin.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=teamwork+is+a+skillPDF 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_off0000ddff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDFF 17684 bytes
SHA-256: 9c4d2e057f57f88748fd1f98222b0527bb9ecabea9b0e6ee69f86e9a9fb33493
font_01_sfnt_off00010a47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A47 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001225e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1225E 10208 bytes
SHA-256: 5919ae6708675e7db15781e4feb15de3e48743fb559b18fb43505dfb35403a0c