Malicious PDF — malware analysis report

Static analysis result for SHA-256 6bbc1a80ed746595…

MALICIOUS

PDF

71.9 KB Created: 2021-09-27 18:51:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: b9d2c23884d4cd3597884ba0289708c4 SHA-1: 613a1ecc80d51f925c3a8ff9ad6e04ecb7a96e3b SHA-256: 6bbc1a80ed7465953637037655ac837ba5706302410b692d374a2bbef3584f26
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as a malicious PDF by ClamAV and an ML classifier. Heuristics indicate it functions as a link farm, directing users to numerous distinct hosts, with one identified as a disposable hosting domain. The embedded URLs and the PDF's structure suggest an attempt to redirect users to potentially malicious websites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://profession-your-dr.com/uploads/files/202109101246038019.pdf In PDF document text
    • http://ayurveda-shiatsu-qigong-nice.com/upload/files/duzazogonaputofab.pdfIn PDF document text
    • https://globalcircle.club/userfiles/file/dobalirofinozi.pdfIn PDF document text
    • https://mavibusiness.it/file/didajopefotalevakizugo.pdfIn PDF document text
    • http://vedepcuaem.com/luutru/files/41082500861.pdfIn PDF document text
    • http://gemculture.com/userfiles/file/31045863106.pdfIn PDF document text
    • http://upasamed.org/Content/uploads/files/dogaxel.pdfIn PDF document text
    • http://leicesterbiketec.com/userfiles/file/nifapudofatadawe.pdfIn PDF document text
    • http://benthanhsgfarm.net/images/uploads/files/48329631952.pdfIn PDF document text
    • https://dolaodong.com/userfiles/file/tabuloduwasaw.pdfIn PDF document text
    • https://avistravel.ro/userfiles/file/tubodafevugesabudodoril.pdfIn PDF document text
    • http://monarchiaerembolt.hu/tmp/kulozeguxunej.pdfIn PDF document text
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/c03c9f663de1ffe008a9183d77a79771/kagafuvukozejinobidog.pdfIn PDF document text
    • https://argekaucuk.com/nbg/upload/files/98340982199.pdfIn PDF document text
    • http://vrzion.com/data/userfiles/files/7691205802.pdfIn PDF document text
    • https://jatransfer.com/userfiles/file/zozaxes.pdfIn PDF document text
    • http://summitremodelinginc.com/userfiles/files/vunidol.pdfIn PDF document text
    • http://cnmrobotics.com/files/files/50747623257.pdfIn PDF document text
    • http://vagtteam.com/userfiles/Files/rapamesixewejiwup.pdfIn PDF document text
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/v73rrf23tpnmi5inc1ivql3kv6/30731066380.pdfIn PDF document text
    • http://www.bluefashion.cz/ckfinder/userfiles/files/sikiwitusubules.pdfIn PDF document text
    • https://mptradingcompany.com/userfiles/file/52409272434.pdfIn PDF document text
    • http://trustycctv.com/ckfinder/userfiles/files/19949414135.pdfIn PDF document text
    • https://bravo-hk.com/userfiles/file/87148310815.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=interstitial+ads+example+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_off0000b2e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2E4 10608 bytes
SHA-256: 6245df7cc3214b9c4814f422f7b9b4c35735efe3b5ce013359c6738e7173e8c1
font_01_sfnt_off0000cb1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB1E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e330.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE330 18172 bytes
SHA-256: ae7ee756f5d39d6a3fd57c9c9cdd6a0f62b8240daf5478ba6245073473b74bee

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