Malicious PDF — malware analysis report

Static analysis result for SHA-256 4efda182e812612d…

MALICIOUS

PDF

78.4 KB Created: 2021-04-03 13:23:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2181454384f26260fb2ce065761ed69a SHA-1: b8bb78769b7065c1095d99e7d95632c7f712e272 SHA-256: 4efda182e812612d75e5b40ec8a76b5adf8fea3b624bdd21484d5ac9c84f737e
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are hosted on file-sharing services, indicating a link farm or SEO poisoning attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, likely to distribute further malware or phish users. While no scripts were explicitly extracted, the PDF structure and numerous URLs point towards a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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/123?utm_term=adaalat+episode+408+full+hd
    • https://pasojifet.weebly.com/uploads/1/3/0/7/130776368/wusax_kasuzukifil_gutiremer.pdf
    • https://cdn.sqhk.co/gejixoneku/lcjfjgo/uncrowned_kings_intro.pdf
    • https://cdn.sqhk.co/purizepore/ghgfFfQ/super_mechs_hack_download_pc.pdf
    • https://javetepamez.weebly.com/uploads/1/3/0/8/130814931/funejajurumaxekufak.pdf
    • https://moluzepin.weebly.com/uploads/1/3/1/8/131856103/f6cf2d712abf473.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://32e47638-7206-44c1-ad53-5c6f9176402e.filesusr.com/ugd/e00742_995982ec6df04af19ad557f70fc7abb6.pdf?index=true
    • https://e5baaea7-7007-41de-9367-4ebf3ed55875.filesusr.com/ugd/8e1900_938ff75cb56f4debab09e7dfa1b97034.pdf?index=true
    • https://uploads.strikinglycdn.com/files/9b799b77-2f27-42b7-b71d-764b5fd9a45a/lg_inverter_v_heater.pdf
    • https://uploads.strikinglycdn.com/files/3166b563-02db-4745-a843-80e38a6c7248/zotumuxupopu.pdf
    • https://b1e6e3cd-24a2-426a-8b7d-e8f4bd81915b.filesusr.com/ugd/83e584_5fe9399464244347946011eb2d744565.pdf?index=true
    • https://ef9d90ca-5811-4a1c-810e-75bcfae60121.filesusr.com/ugd/a33af7_bea0bb6290874f148b82724d7a71aa36.pdf?index=true
    • https://5d55c623-01b0-417f-8131-8dfd0334080c.filesusr.com/ugd/9ef046_0851db1cf606473881a1dc6a83035ff6.pdf?index=true
    • https://2c8134a4-d865-4da1-8961-c755d7242105.filesusr.com/ugd/6dcf04_eaa6e9e532bf4558a10bfd5806499f56.pdf?index=true
    • https://d62ff7d9-aefc-4ab8-8cdf-af38868aea16.filesusr.com/ugd/54b9a1_0cce3e17a1fb4de0a1ee472fad326230.pdf?index=true
    • https://f4e740b0-69d0-4d5c-a0c7-362dc6b2ad6d.filesusr.com/ugd/0356fc_2f054b14007a4e6b8662021da620038f.pdf?index=true
    • https://uploads.strikinglycdn.com/files/5aa38fe8-343b-42df-aa3e-433e5adfc7c0/pnc_bank_address_for_international_wire_transfer.pdf
    • https://ed4d48c2-14ea-47f5-a89a-b82193587323.filesusr.com/ugd/8ce377_ca91b6587c664b628e85ec89d3d719e1.pdf?index=true
    • https://9cc02d22-446e-415d-9686-6e49aadcb3b3.filesusr.com/ugd/aa6a08_78334f5e92cd434394c5a6caecd47372.pdf?index=true
    • https://995be609-08d3-41b1-a6c0-90e53670bcec.filesusr.com/ugd/9988e1_9482f51d05da4929b163e6c13a659829.pdf?index=true
    • https://34e223d5-b18a-4f89-96b3-7c58aa965d90.filesusr.com/ugd/440e29_d1be729be123469aa02bf5c075fcc164.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://www.geocities.com/mitra_anirban/hobbies.htmGNU
    • http://www.gnu.org/copyleft/gpl.htmRegular

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d0dc.bin
5c0456d7780d4d17717a259ad96a878fb83dadb9f8242da0d7a16c9b520a46a2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD0DC 5224 bytes
font_01_sfnt_off0000e2b0.bin
3bc901e7c000b7d9f20e3e0933d74cb222b2a8c4b281db70bcfbfa5bc945e6ea		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE2B0 7264 bytes
font_02_sfnt_off0000faae.bin
e00758fb0aca6d7cb07085b8788c78b12c1d2f57141b86225a3560b5dead3e09		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFAAE 10344 bytes
font_03_sfnt_off00011e2a.bin
05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11E2A 4324 bytes

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