Malicious PDF — malware analysis report

Static analysis result for SHA-256 7267582980e213be…

MALICIOUS

PDF

85.8 KB Created: 2021-09-09 22:22:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ff4c8e2160733cb93dd8b66b1da38ca0 SHA-1: 64f9b2d9ef352e75547ac3c9dbb63976316260d7 SHA-256: 7267582980e213beba983f11e96611a2cedc1857fa07dc8c000ddd83998e7351
66 Risk Score

Malware Insights

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

The ML classifier strongly indicated maliciousness, and the PDF was identified as a link farm with numerous external URIs. The document body is heavily obfuscated and unreadable, suggesting an attempt to hide its true nature. The presence of many unknown URLs, some hosted on potentially disposable domains, further supports a malicious intent, likely to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 4

  • 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://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/a10efa82348cd641cf218fbe61f6942b/bifileziz.pdf In PDF document text
    • https://thuaphatlaihanoi.net/uploads/files/13262975380.pdfIn PDF document text
    • http://retrievers.su/ckfinder/userfiles/files/22611221786.pdfIn PDF document text
    • https://portalbime.com/UploadedFiles/New/file/16725720866.pdfIn PDF document text
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/6e4423e4931ed9c5d07c0ca6bda7f99e/guweduwuveto.pdfIn PDF document text
    • http://3e-recycling.ru/app/webroot/filesfiles/nejuwi.pdfIn PDF document text
    • http://fcv-bo.org/data/fcv-bo/userfiles/file/pawefadaguz.pdfIn PDF document text
    • https://agronlogistics.com/userfiles/files/15335003217.pdfIn PDF document text
    • http://melabo.com/upload/files/27976308367.pdfIn PDF document text
    • http://uekekb.ru/!upload/files/piroxojevugosutudiko.pdfIn PDF document text
    • https://activepymes.com/pub/file/metuwewovojutafigovazod.pdfIn PDF document text
    • https://sieuthimayphat.com/ckfinder/userfiles/files/birijugubupabemibolojox.pdfIn PDF document text
    • https://pergamine.com/ckfinder/userfiles/files/77311616817.pdfIn PDF document text
    • http://transchem-tech.com/Uploadfiles/files/55982852331.pdfIn PDF document text
    • http://hamdannepal.com/userfiles/file/sizibotolomobeg.pdfIn PDF document text
    • http://bibrka-school.org.ua/ckfinder/userfiles/files/36818787290.pdfIn PDF document text
    • http://huabulaw.com/uploadpic/2021-9/file/2021090907275573499.pdfIn PDF document text
    • https://ww150004.linebot.net/upfile/files/20210906234838.pdfIn PDF document text
    • https://eclearusa.com/images/file/diwemagavijofaz.pdfIn PDF document text
    • http://mcutech.net/upload/2021/09/file/1630713502325094450.pdfIn PDF document text
    • http://ohmamakitchen.com/uploads/files/kodokadasotivojoz.pdfIn PDF document text
    • https://pecsikult.hu/files/file/pavopizavenofaxo.pdfIn PDF document text
    • https://tahitotfaluovodak.hu/ckfinder/userfiles/files/rokowuf.pdfIn PDF document text
    • http://radyoislam.com/resimler/files/48371885121.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=eshareserver+for+windowsPDF 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_off0000ece8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECE8 17176 bytes
SHA-256: d6c6dcb1c27feedb7bc1eb27af67f9910752cfb0a795658c7065b8b60ad57c63
font_01_sfnt_off0001197d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1197D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013194.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13194 10440 bytes
SHA-256: 8805cb5c2be7f9e198cd9e4e3cfa70965f3dbe030db1746e9f6730f764c9b109