Malicious PDF — malware analysis report

Static analysis result for SHA-256 a683a9043734edf7…

MALICIOUS

PDF

81.0 KB Created: 2021-05-21 20:32:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 87eed0d6e546f759a1632327eedfdf89 SHA-1: 45d19d72cab3cd13519aea74d3f13db73f97a4e0 SHA-256: a683a9043734edf7c80a1224dcc54488a26a019dde82eacfc57e2a24d916d33e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of external links, many pointing to Weebly-hosted PDFs, which is indicative of a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or SEO manipulation. The embedded URLs are the primary indicators of compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://leonvi.ru/strik?utm_term=guia+de+normas+apa+2019 PDF link annotation
    • https://riguzegadediva.weebly.com/uploads/1/3/5/3/135314075/72aa3e.pdfIn PDF document text
    • https://vofamebibefa.weebly.com/uploads/1/3/4/6/134694090/majowalanuwubas-rorubelo-sefujurinenedum.pdfIn PDF document text
    • https://vakurizilobiwil.weebly.com/uploads/1/3/0/9/130969742/1dcfb0.pdfIn PDF document text
    • https://labivuzixifazer.weebly.com/uploads/1/3/4/3/134310915/8697343.pdfIn PDF document text
    • https://mofibowego.weebly.com/uploads/1/3/1/4/131406437/sodegoxuzit.pdfIn PDF document text
    • https://zuxoviwizazuma.weebly.com/uploads/1/3/4/7/134737549/degapiputerevag.pdfIn PDF document text
    • https://rabidibizuzej.weebly.com/uploads/1/3/4/6/134648686/164ac9fc434e28.pdfIn PDF document text
    • https://vibakifekapob.weebly.com/uploads/1/3/1/3/131398015/ab793fc.pdfIn PDF document text
    • https://wakaxizuso.weebly.com/uploads/1/3/5/3/135322555/1375370.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/vuxalirudidel/which_is_the_best_baofeng_handheld.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c757b827-afc0-432a-b78c-2cb06a5b601f/wekarilurerepexivoka.pdfIn PDF document text
    • https://s3.amazonaws.com/takateg/features_and_characteristics_of_information_technology.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1eee7a9c-c406-4e23-a17d-7b4dd1559dcc/zezolosixikoteze.pdfIn PDF document text
    • https://s3.amazonaws.com/gekojulog/how_to_write_a_reaction_paper_to_a_newspaper_article.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0a3a4957-359c-4bac-8e33-977984993f43/ruxizikavifasixulosus.pdfIn PDF document text
    • https://s3.amazonaws.com/meludav/kinufimun.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a8a4c504-9714-4cc3-93a6-4cabe8da2916/91807267116.pdfIn PDF document text
    • https://s3.amazonaws.com/tujeviwakirawu/64221675462.pdfIn PDF document text
    • https://s3.amazonaws.com/gurowozenupifi/87553578473.pdfIn PDF document text
    • https://s3.amazonaws.com/lewuli/sibefi.pdfIn PDF document text
    • https://s3.amazonaws.com/fukepez/huawei_chc-_u01_firmware.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_off0000f9da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9DA 5588 bytes
SHA-256: ffc0e8b1928c59045108ba5e2ef9cf5a1c789c74716984b8bbad33d3856a4d8b
font_01_sfnt_off00010cc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CC6 13184 bytes
SHA-256: 54a7533a5e8c8b337bf7007af5833c95dec205aff96a66c702634e6a583135f2

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