Malicious PDF — malware analysis report

Static analysis result for SHA-256 461d9dbcf4e8d2d5…

MALICIOUS

PDF

106.1 KB Created: 2021-02-19 01:17:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 17313f77463711ae8a9e6729e7db9c9b SHA-1: e8be36a396118d6ca4c5f58f2aae7d8e98f999d1 SHA-256: 461d9dbcf4e8d2d5329dbb4b7245b6d7893753f42fee82a4583e0b8adca3f65c
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many of which point to PDFs hosted on various domains, suggesting a link farm or redirection mechanism. The primary external URI points to a URL that appears to be related to software downloads, a common lure for phishing or malware delivery. No scripts were extracted, but the PDF structure itself facilitates the distribution of malicious links.

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://jacksth.ru/123?utm_term=belkin+f5d7230+4+easy+install+wizard+software+download PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4380539/normal_600b2b0e4da37.pdfIn PDF document text
    • https://daxekofaji.weebly.com/uploads/1/3/1/6/131606395/7040276.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4419236/normal_5ffbd313ed360.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4493888/normal_5ff7a391c0751.pdfIn PDF document text
    • https://jepololazatozuj.weebly.com/uploads/1/3/4/6/134601538/lozipudixad.pdfIn PDF document text
    • https://lelopotive.weebly.com/uploads/1/3/0/7/130738546/1227776.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4390081/normal_5fee0d73d3558.pdfIn PDF document text
    • https://cdn.sqhk.co/safubuguva/hdxjiQE/how_to_change_screen_time_restrictions_on_iphone.pdfIn PDF document text
    • https://tosopolugo.weebly.com/uploads/1/3/4/4/134440872/5126085.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387698/normal_5ff3a2d72204c.pdfIn PDF document text
    • https://xapitutas.weebly.com/uploads/1/3/0/8/130813648/kepemupogufotu-semunosale.pdfIn PDF document text
    • https://cdn.sqhk.co/rebiguta/fvBbhbv/best_free_vpn_for_pubg_mobile_in_pakistan.pdfIn PDF document text
    • https://baxelawinojiw.weebly.com/uploads/1/3/4/3/134333718/b3e62e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4460970/normal_5fca3ee3b6570.pdfIn PDF document text
    • https://xeromikivato.weebly.com/uploads/1/3/2/6/132695960/198bfb.pdfIn PDF document text
    • https://xoxekoxezugox.weebly.com/uploads/1/3/0/7/130738790/7104519.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/sesafefanulokam/tijutovixomegigurepivib.pdfIn PDF document text
    • https://s3.amazonaws.com/dudujopixejikug/article_1315_du_code_civil_rforme.pdfIn PDF document text
    • https://s3.amazonaws.com/vigevot/67717052575.pdfIn PDF document text
    • https://s3.amazonaws.com/gurowozenupifi/multiplying_and_dividing_decimals_worksheet_and_answers.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_off00015408.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15408 5988 bytes
SHA-256: d4a16666fc6ea5e6eaae54d4add2b5cbe03115a7171ed9cd6df6100299529a7a
font_01_sfnt_off000168b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x168B0 14676 bytes
SHA-256: 4f2a7a2ca7d9b32df78f3f591e34b7f5421cbb842d4f786e9854cab0609766e8

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