Malicious PDF — malware analysis report

Static analysis result for SHA-256 21f8750844d87bcb…

MALICIOUS

PDF

66.7 KB Created: 2021-04-02 15:30:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: feb3d933810e3beb8aed1c0edcc47f54 SHA-1: 5db881c4882985b6584efb58cc83ebcba8469fd4 SHA-256: 21f8750844d87bcb6f914714d565beaf957b7c4cc9fb87caa93faf52167b34cd
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, exhibiting characteristics of a phishing or malware distribution lure. It contains a large number of external links, many pointing to PDF files, suggesting a link farm designed to obscure malicious activity. The document body, though heavily obfuscated, appears to be a deceptive lure related to a lunch menu, likely intended to trick users into visiting malicious URLs.

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://jumiwimov.ru/wix?keyword=st+clair+r13+lunch+menu PDF link annotation
    • https://lajutiruwogow.weebly.com/uploads/1/3/4/5/134585316/mowedabaf.pdfIn PDF document text
    • https://foxodutamawasu.weebly.com/uploads/1/3/4/5/134587344/vofunoseda.pdfIn PDF document text
    • http://sejerodetupumil.medianewsonline.com/breaking_dawn_part_2_book_download.pdfIn PDF document text
    • https://boxesagako.weebly.com/uploads/1/3/4/5/134589877/e2e1909.pdfIn PDF document text
    • https://latavulepa.weebly.com/uploads/1/3/4/4/134461708/lexufo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zumijuxuv.epizy.com/80080142729.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bedbad10-a020-44e4-a45e-3bb6cc684e60/dell_latitude_e6540_screen_resolution.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d3ebf003-0f0a-4208-a910-6bb6239758a2/fedekifinurel.pdfIn PDF document text
    • https://s3.amazonaws.com/suximawo/credit_risk_interview_questions_and_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/wetowuzuxit/72304169700.pdfIn PDF document text
    • https://s3.amazonaws.com/fizup/89008616503.pdfIn PDF document text
    • https://s3.amazonaws.com/lixisariwulo/zubiliw.pdfIn PDF document text
    • https://s3.amazonaws.com/lonozote/what_are_some_examples_of_projects_with_embedded_real_options.pdfIn PDF document text
    • https://s3.amazonaws.com/tawovojo/apa_style_report.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f95ecacf-edb1-4743-afd9-c401ca8a1743/foborowizusunasefimelefu.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_off0000c79f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC79F 5180 bytes
SHA-256: 8005a56d4427a6f36069602723db2dd11559c5bc2ce30d9133aa5532fb4258fc
font_01_sfnt_off0000d91e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD91E 10768 bytes
SHA-256: 9fe39b2860c4f78d91e34e4e2921f204fc447274a85e8969ed7ebd67552d0527

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