Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9d055414f7ef49f…

MALICIOUS

PDF

78.0 KB Created: 2021-04-04 09:00:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 674fbf53690ff8e03533f66518a84ff2 SHA-1: 2a468c3e9e33227cdbb4129a5f4eb892ff886497 SHA-256: c9d055414f7ef49ffa2c67a8786b7827079d27b2407d30182a67d3a5bddccc32
156 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_LINK_FARM' suggests the document contains a large number of external links, pointing towards a phishing or SEO spam campaign. The presence of embedded URLs further supports this, as they likely lead to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://ponafet.ru/strik?utm_term=charlie+and+the+chocolate+factory+famous+lines
    • https://static.s123-cdn-static.com/uploads/4468831/normal_5fe208ac9036e.pdf
    • https://webemibas.weebly.com/uploads/1/3/5/2/135298215/kisekan.pdf
    • https://tikobivit.weebly.com/uploads/1/3/1/3/131382680/majezolekin.pdf
    • https://konupalak.weebly.com/uploads/1/3/5/3/135315701/351353.pdf
    • https://mafaredoli.weebly.com/uploads/1/3/2/6/132695491/ba5bbecedbd2.pdf
    • https://wesuzekubiw.weebly.com/uploads/1/3/1/6/131607103/4021871.pdf
    • https://cdn-cms.f-static.net/uploads/4366633/normal_6041bb1823513.pdf
    • http://fixisotaj.22web.org/fovuwasowutiv.pdf
    • https://cdn-cms.f-static.net/uploads/4366628/normal_6057b10cab227.pdf
    • https://static.s123-cdn-static.com/uploads/4411702/normal_5ff8a6df9f6e1.pdf
    • https://static.s123-cdn-static.com/uploads/4403414/normal_5ff03e703236e.pdf
    • https://cdn-cms.f-static.net/uploads/4408336/normal_6043e797341e9.pdf
    • https://cdn-cms.f-static.net/uploads/4417309/normal_604e8cda83660.pdf
    • https://cdn-cms.f-static.net/uploads/4495849/normal_603cbb407551e.pdf
    • https://static.s123-cdn-static.com/uploads/4467274/normal_5fcef34a8c6a6.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://054d5c26-596f-48a3-87a7-0fc79031e5db.filesusr.com/ugd/599026_a602f7f252034144b0856790c55996e2.pdf?index=true
    • https://e44de090-c64a-4a0f-b555-2784aa0ac37b.filesusr.com/ugd/41d583_c7bdeef00a0a46b9933ada8b111771cf.pdf?index=true
    • https://59548cc9-d6a6-4b2e-bd73-2bfb7290c7b5.filesusr.com/ugd/3fd21f_063d86f1e6cb4bf18476f7cf37d18e71.pdf?index=true
    • https://ee42ee57-4547-4a8c-8a66-6cccb7f6869d.filesusr.com/ugd/2a9ad2_090f996ef7654556886b0a3118850274.pdf?index=true
    • https://1fd079ea-3156-4ae8-a0b4-6153e0b529c5.filesusr.com/ugd/e66bf7_a5d8d5c561e645e087eaae1eace92e77.pdf?index=true
    • https://13006a6e-9b3f-4191-9e3f-064114488741.filesusr.com/ugd/34464a_32893e80affb472eacd6b2efab14176b.pdf?index=true
    • https://35548484-ce42-4b18-9d9d-834326683263.filesusr.com/ugd/a221b6_7a8fa22b41aa4bf58a71f8a4b0d91412.pdf?index=true
    • https://ed4d48c2-14ea-47f5-a89a-b82193587323.filesusr.com/ugd/8ce377_1cfca269c954487f8a0dbddfbe2c61d8.pdf?index=true
    • http://muresapidun.epizy.com/electronic_access_control_thomas_norman.pdf
    • 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_off0000f2f9.bin
97ad0bba7ee2a285f77eb4aa621dea79beb8e24f69f10bccd6b9e1a0f678523f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF2F9 5268 bytes
font_01_sfnt_off000104bc.bin
a2d39bfefeb3ca4d843e08cfddac753c81625165cbf401f65963f8db19bb8454		 pdf-font-stream PDF embedded font (sfnt) at offset 0x104BC 10484 bytes

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