Malicious PDF — malware analysis report

Static analysis result for SHA-256 5575afe9007b4ac4…

MALICIOUS

PDF

75.4 KB Created: 2021-03-23 12:23:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 90c6a8edb139923273e4633869f6d298 SHA-1: 77415a66f72b4fb5ea1e1a4d6570834dd6cc8a9c SHA-256: 5575afe9007b4ac4b08ddbe713432e25bcd8af0749aa1b999bfe4a3beff70725
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 high likelihood of malicious intent. The heuristic firings suggest it contains a large number of external links, many of which are likely part of a link farm designed to distribute malicious content or phish users. The embedded URLs point to various domains, some of which are associated with phishing or malware distribution.

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-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://seumenha.ru/wix?keyword=kfx+400+service+manual+pdf
    • https://nosodelutota.weebly.com/uploads/1/3/1/8/131857544/288574ad1.pdf
    • https://safopuxe.weebly.com/uploads/1/3/4/8/134893808/1de85956.pdf
    • https://cdn.sqhk.co/nebafori/Kqwieki/find_my_phone_by_number.pdf
    • https://kuvomudoriri.weebly.com/uploads/1/3/1/4/131406544/7820252.pdf
    • https://cdn.sqhk.co/visobipibe/ghjihbS/71957312992.pdf
    • https://nebemono.weebly.com/uploads/1/3/4/3/134331812/ff5e8a0.pdf
    • https://zujuwedidikaf.weebly.com/uploads/1/3/4/3/134375258/nexano.pdf
    • https://cdn.sqhk.co/xarozowuzosa/ji3Z2jb/zogudapaginedew.pdf
    • https://cdn-cms.f-static.net/uploads/4378621/normal_60597f19aa882.pdf
    • https://cdn-cms.f-static.net/uploads/4481667/normal_6041c6dfc4f96.pdf
    • https://cdn.sqhk.co/bibikodazit/8hiijjc/car_mechanic_simulator_2015_mod_apk_android_1.pdf
    • https://cdn.sqhk.co/josurowelimu/cuibOCN/87731733058.pdf
    • https://numetoximo.weebly.com/uploads/1/3/4/7/134717633/xamesetulap.pdf
    • https://nesefutuderixu.weebly.com/uploads/1/3/2/7/132740375/rekaxosem-datudatuj-xovawinave.pdf
    • https://mokenexub.weebly.com/uploads/1/3/4/4/134478104/5755766.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://fb5b3b17-6e6a-47c5-ae49-26eddba71e57.filesusr.com/ugd/aff7be_95d976185c5646b4b32656d2163d282d.pdf?index=true
    • https://8c56b32b-3398-45d6-9c0b-b55146621f16.filesusr.com/ugd/6924eb_2eee94431b7b4ae8bb5abe045cbf319c.pdf?index=true
    • https://uploads.strikinglycdn.com/files/6869a361-e641-4463-9a79-3a53f2833d4d/fundamentals_of_the_faith_kreeft.pdf
    • https://8aefc570-8454-48c3-bb63-d4d1067b7ce0.filesusr.com/ugd/5c9621_41e32a72753b45a291a4a132019f4196.pdf?index=true
    • https://uploads.strikinglycdn.com/files/b87bec97-38cc-4b2b-b7ac-43966e1c8354/83768166267.pdf
    • https://933afb0c-60ca-4ff4-ba38-e7c804ca925d.filesusr.com/ugd/941881_ecdf0665712748c39001e828a6a71f01.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_off0000e6b4.bin
7b9dd13e06a5c5f63976775c1bd7120019987b431731410309cd4a4d69da4586		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE6B4 5628 bytes
font_01_sfnt_off0000f9d4.bin
d8a5be9364a6e664e330068727a64dd4fc0871eb588a1ea0623c811a11066cac		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF9D4 10784 bytes

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