Malicious PDF — malware analysis report

Static analysis result for SHA-256 452ff65ae83de039…

MALICIOUS

PDF

77.3 KB Created: 2021-02-19 17:11:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 73e225e82bb573e93c79dcbaad9a3d3f SHA-1: 091cb44ca7a047dbf37180c83c819461f482ab4a SHA-256: 452ff65ae83de039939ee2d9fc25a50b0380cc771048f8f857abbd39d6472828
156 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://druttle.ru/123?utm_term=ryobi+miter+saw+parts+tss102l PDF link annotation
    • http://loxokunetuladi.66ghz.com/american_visa_lottery_2018_form.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384468/normal_601868c2a4318.pdfIn PDF document text
    • https://nozirurabi.weebly.com/uploads/1/3/0/7/130738896/034db425.pdfIn PDF document text
    • http://idealslim-italiaoficial.site/morse_zig_zag_4300_sewing_machine_manualo0zb5.pdfIn PDF document text
    • https://pawonojureva.weebly.com/uploads/1/3/4/5/134522231/7616868.pdfIn PDF document text
    • https://guzezetuxavipub.weebly.com/uploads/1/3/4/7/134765233/xuwujikaja.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/besafefaf/xekefedovijedi.pdfIn PDF document text
    • https://s3.amazonaws.com/zazelujeju/linkedin_post_size_guide.pdfIn PDF document text
    • http://muwiliwus.epizy.com/83162808050.pdfIn PDF document text
    • https://s3.amazonaws.com/tixeligufokup/lexujogewoganiwerarejobaz.pdfIn PDF document text
    • http://rubuvajaroxe.epizy.com/analyze_song_lyrics_worksheet.pdfIn PDF document text
    • http://botusijafen.rf.gd/emirates_flight_attendant_uniform_buy.pdfIn PDF document text
    • https://s3.amazonaws.com/lakujusitejojet/77913180256.pdfIn PDF document text
    • https://s3.amazonaws.com/toguvaju/hvac_commissioning_report.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_off0000eeba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEBA 5632 bytes
SHA-256: 745d68be7cb7a580661ed9c0c01d27e0edf3f7b647921bab8c0af14647d0c64b
font_01_sfnt_off000101e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101E3 11236 bytes
SHA-256: fe0812d1ba42ca79266f883e6c1e0f87a74cc01aa2e7c7698a8a97c44270ba1b