Malicious PDF — malware analysis report

Static analysis result for SHA-256 baae44a4dece9eeb…

MALICIOUS

PDF

75.9 KB Created: 2021-09-18 01:09:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 4de7094f8d3c0c35dbd24f25ecbf274f SHA-1: 5aa352e82a643d5674a5a6e2b4bd302d5d45360c SHA-256: baae44a4dece9eeb498ae28423a83891b6de5bab14e7dff0e002d34579dab070
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier indicating maliciousness. The presence of numerous external URIs, many pointing to disposable hosting and acting as link farms, strongly suggests a phishing or malware distribution campaign. The `PDF_SEO_DISPOSABLE_LINK_FARM` heuristic specifically highlights the nature of these links, indicating a pattern of redirecting users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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=wwe+smackdown+game+apk PDF link annotation
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161305315bd5b2---movubupiv.pdfIn PDF document text
    • http://hieuchuan.com/upload/files/dukubomutofatodubukawan.pdfIn PDF document text
    • http://etpatatietpatata.com/userfiles/files/gomazuguwukenaripojebibig.pdfIn PDF document text
    • http://keystoparadise.com/userfiles/files/49408181222.pdfIn PDF document text
    • https://arendic.cl/files/litajo.pdfIn PDF document text
    • http://scoutpate.com/userfiles/file/47099760018.pdfIn PDF document text
    • http://schuetzenfest-hemeringen.de/ablage/userfiles/files/kosuxifakosijabixevujadu.pdfIn PDF document text
    • http://montesantangelo.it/files/files/vufodofob.pdfIn PDF document text
    • https://autosaloncenter.com/uploads/files/dukexubuxojomegesedajelot.pdfIn PDF document text
    • http://jotekonybakterium.hu/userfiles/files/woguxupevujebuxodijazu.pdfIn PDF document text
    • https://pergamine.com/ckfinder/userfiles/files/15908515523.pdfIn PDF document text
    • https://hotararicedo.ro/files/files/92541394121.pdfIn PDF document text
    • https://tdemo.order-pro.com/ckfinder/userfiles/files/doxademuvo.pdfIn PDF document text
    • http://xsteelstock.com/d/files/3610762192.pdfIn PDF document text
    • http://m-s-g.ru/userfiles/files/texijubegosirewasu.pdfIn PDF document text
    • https://rarahil.org.np/ckfinder/userfiles/files/30675071504.pdfIn PDF document text
    • http://reopen911.info/media/file/421716762.pdfIn PDF document text
    • https://gogift-it.com/userfiles/files/nomifukowasewasotan.pdfIn PDF document text
    • http://myphamnanyno.com/luutru/files/70752208943.pdfIn PDF document text
    • https://dveropolis.ru/upload_picture/68772541174.pdfIn PDF document text
    • http://www.sun-green.eu/ckfinder/userfiles/files/48265261044.pdfIn PDF document text
    • http://studiozoppini.com/userfiles/files/torozazaw.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f3504d25e8---gumipojoxizope.pdfIn PDF document text
    • http://prtourusa.com/FileData/ckfinder/files/20210916_994B66B801A3C54B.pdfIn PDF document text
    • https://leganordavigliana.com/uploads/file/74339552462.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_off0000c475.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC475 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dc8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC8C 10692 bytes
SHA-256: 91a2c7505df0d77e7a2528a4b85aca912810f48c8f9b959a7948ee976c7bd74c
font_02_sfnt_off0000f4e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4E4 17864 bytes
SHA-256: a65ab592acf0c435a7416094be250a5de5db4ae89e9b12d24abfaa5af8d9c398