Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5cfaf4015f6eab9…

MALICIOUS

PDF

74.7 KB Created: 2021-03-29 12:15:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1e778c3e3207c3b4075da53c604091c4 SHA-1: 76b192a96412a16642a7c95d0d4d1191aaed3fb9 SHA-256: e5cfaf4015f6eab9d791496b728100eec1256a29207e8fa795e66433b860089f
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many of which are generated to appear as search results for popular topics, indicating a link farm or SEO spam campaign. ClamAV and ML classifiers identified this PDF as malicious, specifically a phishing trojan. The presence of embedded URLs and the structure suggest an attempt to redirect users to malicious sites, likely for phishing or malware distribution.

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-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://lozipotod.ru/wix?keyword=sword+art+online+season+3+dubbed+release+date
    • https://cdn.sqhk.co/pedidagow/ihfgdSB/when_will_joplin_mall_open.pdf
    • https://cdn-cms.f-static.net/uploads/4461751/normal_6044e0d637913.pdf
    • https://nakuzimatixibo.weebly.com/uploads/1/3/5/3/135388853/jewelaxipum.pdf
    • https://cdn.sqhk.co/dejuxafe/jpjcieG/57104534430.pdf
    • http://natorg.fun/digidesign_mbox_2_mini_how_to_turn_onyso7d.pdf
    • https://cdn.sqhk.co/zabeluzitema/heidvfF/58603556952.pdf
    • https://cdn-cms.f-static.net/uploads/4392660/normal_600c432e024af.pdf
    • https://cdn.sqhk.co/xekejegixawo/icibFhd/44754883845.pdf
    • https://wuvobarapupi.weebly.com/uploads/1/3/0/8/130813490/9603121.pdf
    • http://habercigo.com/porter_cable_model_fn250b_rebuild_kit0iyus.pdf
    • https://cdn.sqhk.co/zikufivol/dhdLNN6/jonatazanop.pdf
    • https://cdn.sqhk.co/muwizavo/iicjdhc/sudoku_gp_2020.pdf
    • https://cdn.sqhk.co/jesisuvov/YSH2hhW/42035960152.pdf
    • https://cdn.sqhk.co/wesifarajaru/Gviihhe/81356416490.pdf
    • https://cdn.sqhk.co/lomekojop/dghat4z/grilled_chicken_sauce.pdf
    • https://cdn-cms.f-static.net/uploads/4465687/normal_6038272632d6f.pdf
    • https://static.s123-cdn-static.com/uploads/4476148/normal_5ffc138db664f.pdf
    • https://dotofinadi.weebly.com/uploads/1/3/0/7/130740455/gagav.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://02687da8-bf2b-436b-a8ca-82c6e04513a5.filesusr.com/ugd/e48f8a_adc60e7c5226423f84c6ac78bf62cdfe.pdf?index=true
    • https://b760d8db-9746-4821-aa2b-94c9f806d328.filesusr.com/ugd/26ce45_e0f96db587c04254a93de556b1f43695.pdf?index=true
    • https://40ba1f7a-6e91-49bb-bbb8-dfbb40a2bc60.filesusr.com/ugd/22bf55_ec7e3e892d2741328f053b64154beae3.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_off0000e652.bin
3bc160f7c75aec22e047af52d878959903aab41feb4fd19afe4b96304319ec0f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE652 5320 bytes
font_01_sfnt_off0000f87d.bin
9dcda358575c989a26d1e46f72e0d491e7b23a51c1699463d252a8735a0a9a43		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF87D 10840 bytes

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