Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5eba7aa5a518a6c…

MALICIOUS

PDF

79.2 KB Created: 2021-02-21 21:28:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 63de888795cd6d588e7d6671104de901 SHA-1: 48f75d4ac5189518ddbb0ff3fe3e7bf0e5663d46 SHA-256: d5eba7aa5a518a6c3e8826bc9a6a3a32043922302361ee632615a1e8e8161ce8
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristic firings point to a PDF link farm containing numerous external links, with one primary malicious URL identified. The document body is heavily obfuscated, preventing a clear understanding of its direct content, but the presence of many external links suggests an attempt to redirect users to potentially harmful websites for phishing or malware distribution.

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://leonvi.ru/wix?keyword=chi%25E1%25BA%25BFn+tranh+th%25E1%25BA%25BF+gi%25E1%25BB%259Bi+th%25E1%25BB%25A9+3 PDF link annotation
    • https://tevejokufip.weebly.com/uploads/1/3/0/9/130969131/f72258f08.pdfIn PDF document text
    • https://sulomotosepotu.weebly.com/uploads/1/3/4/7/134744650/belax.pdfIn PDF document text
    • https://kivalake.weebly.com/uploads/1/3/4/8/134885121/54354.pdfIn PDF document text
    • https://buvefejam.weebly.com/uploads/1/3/1/4/131453018/6872183.pdfIn PDF document text
    • https://xebanodax.weebly.com/uploads/1/3/5/3/135382800/linewalig.pdfIn PDF document text
    • https://kurakozizuvev.weebly.com/uploads/1/3/2/6/132681999/rokuferetil-duwogefoxuwojo-vikajat-gefunurixu.pdfIn PDF document text
    • http://nenugatigubom.66ghz.com/13983982702.pdfIn PDF document text
    • https://pukogapuwobar.weebly.com/uploads/1/3/4/3/134307851/6615226.pdfIn PDF document text
    • https://xinagaxigivawiv.weebly.com/uploads/1/3/0/7/130739766/wafejeditegof.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/widuxade/eukaryotic_cell_labeling_worksheet_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/zidosozawok/brother_dcp-_t310_installer.pdfIn PDF document text
    • https://s3.amazonaws.com/jafujasiwetid/xelazipiji.pdfIn PDF document text
    • https://s3.amazonaws.com/rorives/82802917278.pdfIn PDF document text
    • https://s3.amazonaws.com/fogibi/72573911528.pdfIn PDF document text
    • https://s3.amazonaws.com/selivuvumepaveb/shock_resuscitation_guideline.pdfIn PDF document text
    • https://s3.amazonaws.com/mexesazaxasa/pdf_avivamento_pais_de_gales.pdfIn PDF document text
    • https://s3.amazonaws.com/fuzafuzeruwit/site_of_blood_cell_formation.pdfIn PDF document text
    • https://s3.amazonaws.com/viwoxuz/pedalelurupozedezif.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_off0000e5b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5B2 5296 bytes
SHA-256: 593e0f7046995994ad54ed33895d92e2b692843bf69f6c7744d2160010d9486a
font_01_sfnt_off0000f744.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF744 26292 bytes
SHA-256: 89bf13aacf3614262ab63fa08f3044842aef4bccbb0538673f2ad95d1be711c6

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