Malicious PDF — malware analysis report

Static analysis result for SHA-256 474a12b44a36c888…

MALICIOUS

PDF

80.8 KB Created: 2021-06-02 11:49:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 2e8acbf0975eb11f41ef2ec63561daab SHA-1: 41793e67a2f1f46c82a74875f4607a42232488df SHA-256: 474a12b44a36c88861f52aba4df1174247245c6a2096e56599c0b9eece833dd8
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicative of a link farm designed to redirect users to malicious sites. Heuristics like PDF_SEO_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM strongly suggest this malicious intent. ClamAV also detected this file as Pdf.Phishing.Trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://resalured.ru/123?utm_term=atom+platformio-+ide-+terminal+blank PDF link annotation
    • https://rovonowevon.weebly.com/uploads/1/3/6/0/136051941/vixeboxa-sapipasumis.pdfIn PDF document text
    • https://wuwiragirek.weebly.com/uploads/1/3/0/8/130874366/zoniro_buwuz_zepevuwer.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393022/normal_6042c2a0811a8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451368/normal_5fe7cb0c78450.pdfIn PDF document text
    • https://loniforuwo.weebly.com/uploads/1/3/4/9/134904684/6602619.pdfIn PDF document text
    • https://pamumigupoxip.weebly.com/uploads/1/3/4/6/134614169/zuridigutu-nemaj-wogadululib-duletoki.pdfIn PDF document text
    • https://zetovesejideze.weebly.com/uploads/1/3/1/4/131482946/7098477.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476924/normal_5fec78dc6d90c.pdfIn PDF document text
    • https://fularoxu.weebly.com/uploads/1/3/1/4/131452806/mituk.pdfIn PDF document text
    • https://rijemozedez.weebly.com/uploads/1/3/1/4/131407135/sedizasosokiforobi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://mujusevo.pbworks.com/f/treatment_of_chronic_periodontal.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b7ad6a48-e88c-42e0-81c8-59060641a616/12539781973.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7b432b92-43a0-44de-acdf-0827565e635b/74649784472.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3f6be88c-e12b-4776-88a6-fe01d7fe8c68/which_pipe_is_best_for_gas_lines.pdfIn PDF document text
    • http://funuvutidip.pbworks.com/w/file/fetch/144468633/gizix.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9769c101-6448-4a7c-9f02-2c9854ab5495/fawose.pdfIn PDF document text
    • http://kapetipubi.pbworks.com/f/26071074048.pdfIn PDF document text
    • http://lijegazoz.pbworks.com/f/bissell_proheat_2x_lift_off_parts.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/29012dc1-d5b4-46f2-bc80-060febe764ef/64389245174.pdfIn PDF document text
    • http://ronefete.pbworks.com/w/file/fetch/144492498/online_video_format_converter_mp4_to_wmv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/80c52c70-3929-458a-87cd-ea0bddbf7fec/gemela.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e450.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE450 5236 bytes
SHA-256: cf689b3fd9f86d879be84674742f43667ea81edf9bc1dd6c50e1da878c7a0701
font_01_sfnt_off0000f60e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF60E 12120 bytes
SHA-256: 69bc2316f51af6404c79e895e447c5c466c672c0f1df38ab50645abe011fb091
font_02_sfnt_off00011e9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E9A 16116 bytes
SHA-256: afbdbd02dec82d9be1e07df9ab92004d6e2996c86bdcb9c83a2c1f8ac0d08daa