Malicious PDF — malware analysis report

Static analysis result for SHA-256 be490ca2d8975cd9…

MALICIOUS

PDF

74.4 KB Created: 2021-05-20 06:43:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 2c1c622269c38d3f691bc4a427c5cc77 SHA-1: 2ca0661065efbc23cddcf1f9c3d7d44ae6499e8a SHA-256: be490ca2d8975cd9540d8bd983dbbb1faf3bb5e4ccb53bb175db0a05f7d6cb46
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, identified as a 'PDF_SEO_LINK_FARM', suggesting a malicious intent to redirect users. The embedded URL 'https://lozipotod.ru/strik?utm_term=the+seagull+reader+essays+3rd+edition+pdf+free' and the first link in the link farm 'https://dirotazu.weebly.com/uploads/1/3/0/1/131070105/a451ff8f7.pdf' are flagged as suspicious. ClamAV detection and ML classification further support the malicious nature of this file, indicating it is likely a phishing or trojan distribution mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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/strik?utm_term=the+seagull+reader+essays+3rd+edition+pdf+free PDF link annotation
    • https://dirotazu.weebly.com/uploads/1/3/1/0/131070105/a451ff8f7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405946/normal_603f5154831f3.pdfIn PDF document text
    • https://xatefokagakutil.weebly.com/uploads/1/3/4/1/134108848/sugedakeben.pdfIn PDF document text
    • https://zevigutuxokalu.weebly.com/uploads/1/3/4/7/134769804/731b90deab.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470960/normal_604b2a1e570a2.pdfIn PDF document text
    • https://dizegeduwawab.weebly.com/uploads/1/3/4/3/134374994/def4e39c6f6d5f.pdfIn PDF document text
    • https://fafemuwupid.weebly.com/uploads/1/3/4/3/134368635/5811364.pdfIn PDF document text
    • https://sugelazo.weebly.com/uploads/1/3/4/7/134767002/felakeximalizuf.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/rozebofukixus/canon_ip1800_printer_software_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6e479236-d974-41a1-94c9-bbf49f902c27/what_happens_after_a_depression_economy.pdfIn PDF document text
    • https://s3.amazonaws.com/zunewidimem/2375908451.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a564dc20-e0b2-41a9-ada1-acd36373733d/69807169314.pdfIn PDF document text
    • https://s3.amazonaws.com/tarajix/kejafesagavatutasex.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/695ebc1e-5317-4084-9a3e-7f789c6e74b8/83706236245.pdfIn PDF document text
    • https://s3.amazonaws.com/rabewiruzitewa/rugorefugikewadanux.pdfIn PDF document text
    • https://s3.amazonaws.com/dorobukasawituw/excel_vba_programming_tutorial_for_beginners.pdfIn PDF document text
    • https://s3.amazonaws.com/pokorevalaxex/jovojuxesidiwiwuwedowe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/301be1ca-a0e7-4727-9c53-3a9ec0d579d6/nokofisudomenopozid.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e3a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3A6 5516 bytes
SHA-256: a5f1cecbb1dba6262abbbe144b22c33a55585d5a23ebda5ee7c76826c0c29c1b
font_01_sfnt_off0000f66b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF66B 11008 bytes
SHA-256: 80829b7219903cc6518af246709dbb18a9cf3378c34446b75a08d60b8c03dbbd

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