Malicious PDF — malware analysis report

Static analysis result for SHA-256 c062a83027fcd34f…

MALICIOUS

PDF

95.5 KB Created: 2021-03-29 05:11:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4aefcb4d410d9ad24cc758d83bfd9019 SHA-1: 5205a82ae1890a484fcf6cdd9addfd23a384396c SHA-256: c062a83027fcd34f9070cabfa64924d88a8c8e42fa987858168821695a933044
164 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristic findings point to a link farm strategy, where numerous external PDF links are embedded within the document, likely to distribute further malware or engage in phishing. While no scripts were directly extracted, the PDF structure and embedded URIs suggest an attempt to redirect users to malicious sites for content delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • 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
  • 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://kuzutuzo.ru/award?keyword=medical+tourism+index+pdf
    • https://xuvamifete.weebly.com/uploads/1/3/0/8/130874567/28904.pdf
    • http://checkmycredit.info/algebra_1_textbook_common_core_edition5lree.pdf
    • http://tokio-2020.fun/wosomop93f81.pdf
    • https://xemewewekakefo.weebly.com/uploads/1/3/5/4/135401485/204c648.pdf
    • https://zabagazepag.weebly.com/uploads/1/3/4/4/134498959/76a2fc4d684b42.pdf
    • http://eliyalte.com/zevamoseposedxp9hb.pdf
    • http://mebets.xyz/asus_x205t_battery5nzqh.pdf
    • http://gixapovunugu.getenjoyment.net/bawajumozaduzela.pdf
    • https://sajozigita.weebly.com/uploads/1/3/0/8/130814351/zulasenijubebaxexa.pdf
    • https://saboruxeketeg.weebly.com/uploads/1/3/4/8/134850947/jizesadi.pdf
    • http://dezimazokuxulil.mygamesonline.org/odisha_tourist_place_list.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://fccd5518-64e1-462d-9dbe-8d8d8a19ca7a.filesusr.com/ugd/eb005d_a7635ca27f294776851eabe0302372ef.pdf?index=true
    • https://7605d98d-8b17-4a41-9383-f5c8d5af9bcc.filesusr.com/ugd/2bed4c_c1bcfbad9c7e4ee8901da5c24e82eacd.pdf?index=true
    • https://923a8ca3-316b-4844-b38f-9bc955ad4852.filesusr.com/ugd/312e0e_26a86d6ff932409882e65e3a7f0c0e4f.pdf?index=true
    • https://5405d108-7f1e-482b-a10c-e06f62b7505d.filesusr.com/ugd/d941b1_f6ad468746794a37b1fd0ce0487e8779.pdf?index=true
    • https://ced6af22-cf5f-4df0-9cd6-2d424634d287.filesusr.com/ugd/3eed2b_0952fa64cb4c48d2b7588eba03caaad8.pdf?index=true
    • https://0c3b2bb2-3ac9-4e0e-a0b2-530a831cdf0d.filesusr.com/ugd/23193f_fcd6af3b6f5a4b2497c9a0303120577c.pdf?index=true
    • https://48e6b720-b653-4920-beb0-7ef171ab6ab9.filesusr.com/ugd/d9d1f5_227c5ceeac5b40d28f8fbf396c985795.pdf?index=true
    • https://uploads.strikinglycdn.com/files/ed41caaf-1009-42e5-a941-bbf1b64b3ddd/buvomuf.pdf
    • https://2d841ef3-a248-4e6a-996b-2d54d6713fdd.filesusr.com/ugd/1decf9_be114941aac54f58b2271af5c9e7acb1.pdf?index=true
    • https://uploads.strikinglycdn.com/files/bfa1e9ee-203e-4267-af9f-3efb75ab90f0/how_much_is_it_to_hire_a_carpet_cleaner_from_woolworths.pdf
    • https://uploads.strikinglycdn.com/files/54c2ac92-ea5b-4620-80f3-8dc746f74497/what_are_text_signal_words.pdf
    • https://uploads.strikinglycdn.com/files/2c1c7f2b-02dc-4c79-92e0-17f226d58ea3/339994205.pdf
    • https://uploads.strikinglycdn.com/files/6a26fd39-4ec6-4834-ace5-b73bf56a228d/starbucks_iced_cups.pdf
    • https://7f03322d-63d6-449b-a8c2-a80beffeb2b6.filesusr.com/ugd/2994dd_90a4f5fb34d04e42ab4e0279ad189cf2.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 6

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f7a0.bin
7bc3f531822e0aaecc36b694f4219a49e15fbaf6890d8fe207c031b3318dd4ab		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF7A0 3832 bytes
font_01_sfnt_off00010569.bin
0d0f16d53ed10cf5bad261318cd0b40761c7bab03389162a902ae2f50dbcb221		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10569 5256 bytes
font_02_sfnt_off0001172b.bin
433774a4c24b00b3bfae905ce80413620e746951c70b311cb92dce6e5af49373		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1172B 9404 bytes
font_03_sfnt_off000125a4.bin
54b254d56ac30c28a208537fb31ff034966f3c12c3809a5e414da498117a558c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x125A4 11388 bytes
font_04_sfnt_off00014c55.bin
4ef9506ee11a349461550e6b437e3786686b598308a87786035880d16624999d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14C55 16060 bytes
font_05_sfnt_off000160ed.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x160ED 4324 bytes

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