Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a8dbc99ffdcacc3…

MALICIOUS

PDF

90.2 KB Created: 2021-05-24 07:27:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 0b33fe0013ba6bf519bab9b3d1e87882 SHA-1: 69b830ffd861a7b0d1eab7edc2acbce77fc3091e SHA-256: 2a8dbc99ffdcacc3a40d8f9fc507a90feaf14ca2421b50c9339cddfeb8fd5f95
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, many of which point to seemingly unrelated PDF documents, suggesting a link farm or SEO poisoning tactic. The primary external URI, 'https://zajinet.ru/strik?utm_term=how+to+install+beat+saber+mods+oculus+quest+2', is likely a lure to a malicious site. ClamAV and ML classifiers also flagged this PDF as malicious, specifically as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://zajinet.ru/strik?utm_term=how+to+install+beat+saber+mods+oculus+quest+2 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4407781/normal_6034dba605253.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4372963/normal_5fcac244bcf58.pdfIn PDF document text
    • https://gisafonenum.weebly.com/uploads/1/3/5/3/135323636/b311c759.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449185/normal_5fce707f1851c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4424951/normal_5ff0753746516.pdfIn PDF document text
    • https://tesiligozi.weebly.com/uploads/1/3/1/4/131407846/tanefapot-jewolix-lekutolupi.pdfIn PDF document text
    • https://gapidekejoz.weebly.com/uploads/1/3/4/8/134876705/e77ffeca.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/widofafane/4_pics_1_word_level_2245_answer.pdfIn PDF document text
    • https://s3.amazonaws.com/zuses/fanamojijuwenasebasatitip.pdfIn PDF document text
    • https://s3.amazonaws.com/patotale/benefits_of_information_technology_in_agriculture.pdfIn PDF document text
    • https://s3.amazonaws.com/zibenoroduzuw/jet_18_inch_bandsaw_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/wuzalugiseto/chasma_laga_ke_nagpuri_dj_song.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f62e23a6-3ef8-472d-9e86-c8cbd8e47d52/15501976995.pdfIn PDF document text
    • https://s3.amazonaws.com/paxuvagal/how_to_prepare_income_statement_for_construction_company.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5ebcf313-95a1-4acf-a813-fe8d81e63f47/bipetizo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dd7eb18b-fdaf-4f7f-950d-db11513dd576/dotokef.pdfIn PDF document text
    • https://s3.amazonaws.com/varolexexus/55734457677.pdfIn PDF document text
    • https://s3.amazonaws.com/bisute/cms_report_page_online.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000113fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113FE 5420 bytes
SHA-256: d20206581c94b18c44a8096e728431d349170af6b5bf7b62ed411347e41b1704
font_01_sfnt_off0001264e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1264E 11916 bytes
SHA-256: b8a7949853f6b8b7550bede33356b11982c3a6b95baf11ccf575e46aead8688f
font_02_sfnt_off00014d72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D72 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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