Malicious PDF — malware analysis report

Static analysis result for SHA-256 04b52da605f40192…

MALICIOUS

PDF

76.4 KB Created: 2021-03-30 04:43:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 6e5db2f54f97426ab3bee58e9618b184 SHA-1: 449cfbee04787b8476560a1748df86c4f2a30230 SHA-256: 04b52da605f40192abddbded8046a877d090a60a0b5f8137e54427850c099d37
164 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 high likelihood of malicious intent. It contains a large number of embedded external links, many of which point to other PDF files, suggesting a link farm or redirection mechanism. The document body, though heavily obfuscated, contains text related to media downloads, likely a lure to disguise the malicious nature of the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://druttle.ru/strik?utm_term=story+of+my+life+one+direction+mp3+download+musicpleer PDF link annotation
    • http://huaweistoreukr.xyz/what_do_you_understand_by_food_chain_and_food_web62mp2.pdfIn PDF document text
    • http://ch-bewertung-2888.xyz/logic_gates_viva_questions_with_answersas1z8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4381978/normal_6000244c20f50.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464720/normal_60545fbf28c0a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413227/normal_5ff8d7bf02c5c.pdfIn PDF document text
    • http://starconflict-game.ru/91462133929xq3ma.pdfIn PDF document text
    • http://psychologyrelax.xyz/faresakzpx2k.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/supefujoxopubu/vadunu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ddf7ad0f-8ef8-472a-bc83-6e64402ea2d1/tafagatagopipovudomur.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5769be41-553c-476e-a45e-5f6a08ca35bf/14964408497.pdfIn PDF document text
    • https://e691ad07-92dc-45fa-af10-8929b4045ede.filesusr.com/ugd/87b9a8_69177f6209464433a3fbed8713184eef.pdf?index=trueIn PDF document text
    • https://21319658-e817-4d6a-846f-872ccfe0f0c2.filesusr.com/ugd/982af2_7f76d5969198448699555c1d0e83e285.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vuterijoze/buxejiwuralasepurowifu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9f7059e7-6e6f-4097-a783-a04f7a8b93f7/organic_chemistry_1_practice_problems_and_solutions.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/94de2fc7-0d4e-41cc-9d68-90b5d69c37b3/how_to_make_xfinity_remote_control_tv_volume.pdfIn PDF document text
    • https://s3.amazonaws.com/mikibetiv/75894251299.pdfIn PDF document text
    • https://s3.amazonaws.com/zijivevip/5325120786.pdfIn PDF document text
    • https://s3.amazonaws.com/sojaxub/adobe_xd_cc_for_windows.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA4E 5764 bytes
SHA-256: b9fb8a4e305b6f22d3d701b413ede8052667798b04a0f114b5528481b5a148e5
font_01_sfnt_off0000fdef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDEF 11176 bytes
SHA-256: 8938a444ccfa7f10aa0a9e0915af2472e472f5595d3da696ff537f6603daf8cc

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