Malicious PDF — malware analysis report

Static analysis result for SHA-256 8dcd07ebb26b86db…

MALICIOUS

PDF

76.1 KB Created: 2021-03-16 17:10:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5d5ff705b4c1808032ead06d3068e804 SHA-1: 7879bac6a91c8284cfee155195c2c2cdbce8226b SHA-256: 8dcd07ebb26b86db5229b660633fcc09a1bc8bc5b0980e217b3383c842c8b206
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan threat. The heuristic firings reveal it contains a large number of external links, suggesting a link farm or redirection mechanism to malicious sites. The document body, though corrupted, contains text related to a study guide, which is likely a lure to encourage users to click on the embedded malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://vilenefex.ru/wix?keyword=geometry+chapter+9+study+guide+answers
    • http://rozixebo.22web.org/77753035429.pdf
    • http://kutatit.getenjoyment.net/degolorumakepikudajateri.pdf
    • http://lazirawolewok.getenjoyment.net/gigozosalarafu.pdf
    • http://wapadax.scienceontheweb.net/sickle_cell_disease_genetics_and_geographical_distribution.pdf
    • http://taxiralimivi.iblogger.org/majeludinatidi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://fuvituze.epizy.com/91772445343.pdf
    • https://uploads.strikinglycdn.com/files/5aa67507-3e7a-4cbb-b5ce-a7c5e6b11d38/18944132301.pdf
    • https://uploads.strikinglycdn.com/files/5184a0e9-623a-4e66-949b-70978de57fcd/53181676252.pdf
    • https://uploads.strikinglycdn.com/files/11082bfc-4f8b-48a6-aecd-5e58faa5298d/practicing_the_presence_of_god_brother_lawrence.pdf
    • https://e50eee24-2d95-422d-8083-6f618d95927b.filesusr.com/ugd/594ae5_0085b408bf45484cb34d7fca43f540b9.pdf?index=true
    • https://uploads.strikinglycdn.com/files/af4fbf6e-d9d4-477c-8a8f-f75f01de3333/62496353364.pdf
    • http://gofosuxubajo.epizy.com/76896120673.pdf
    • https://uploads.strikinglycdn.com/files/4c59dfa1-fb26-4848-8a3b-64ed88a9008d/tamapateguse.pdf
    • https://uploads.strikinglycdn.com/files/1de3d1a0-002d-440d-8451-e375eb1435c0/panasonic_kx_t7633_manual.pdf
    • https://uploads.strikinglycdn.com/files/c4d32b8f-18a4-4335-9de4-d47650d56a36/gewoxojap.pdf
    • http://vigijig.rf.gd/butyl_formate_uses.pdf
    • https://11f44e1d-c86f-4be6-baa1-90970e7c24f5.filesusr.com/ugd/a298ce_978385db900f46cda2abe216b1175576.pdf?index=true
    • http://zefajutuwe.epizy.com/73531118091.pdf
    • https://uploads.strikinglycdn.com/files/8033b01c-e25d-4725-8c1e-d57c4b8d9240/welder_interview_questions_and_answers.pdf
    • https://f1cb2ec4-a82d-4768-8a06-5236a2db220e.filesusr.com/ugd/a2e20a_3590344b3d9e4ba8a317647203651d67.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb65.bin
9db4c82501da58cc2e126f7c77a4ed586e722cbe5fee05c0bab595c29dc0ca19		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEB65 5836 bytes
font_01_sfnt_off0000ff2d.bin
87370e5b30a9b5883aadd2c8ccd735cf99c23a35df0631bf7940773ae8b50e69		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFF2D 10652 bytes

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