Malicious PDF — malware analysis report

Static analysis result for SHA-256 266ca4f4f8190adc…

MALICIOUS

PDF

79.8 KB Created: 2020-12-19 10:44:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 7366242b96a7781e024ff2e049c488cb SHA-1: dfb83fdc4d1a1da97966e7c8c7bf5307636f6955 SHA-256: 266ca4f4f8190adc29388afac449c8fba27a849dc5d9875c2dd447cd968404ef
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a PDF link farm and a critical ClamAV detection. The primary URL, https://trafficel.ru/aws?utm_term=keyboard+cat+notes+sheet+music, suggests a phishing or SEO manipulation attempt. The presence of numerous external links points towards a strategy to distribute or link to other potentially malicious content, aligning with a spearphishing attachment vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://trafficel.ru/aws?utm_term=keyboard+cat+notes+sheet+music PDF link annotation
    • https://bikiwilusi.weebly.com/uploads/1/3/4/5/134512037/situmus.pdfIn PDF document text
    • https://rimofunoduw.weebly.com/uploads/1/3/4/5/134525219/78db467ca22c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490263/normal_5fca9c2dcd813.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371536/normal_5f96bfb8ac8cf.pdfIn PDF document text
    • http://fontawesome.iohttp://fontawesome.io/license/In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/gumegulaxi/complete_estimation_and_costing_of_residential_building.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbffa571c8c7413142c9acf/t/5fc1150c1972c46e3cc4bb8b/1606489357294/joshua_and_sons_watches_ebay.pdfIn PDF document text
    • https://s3.amazonaws.com/gaxuremewuger/change_column_width_google_sheets_ios.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fdcb8151ac7e22a65153ef0/t/5fdccc0c7fb6a144600bff8f/1608305676816/guided_reading_year_2_activities.pdfIn PDF document text
    • https://s3.amazonaws.com/lusegokaves/video_downloader_apk_for_computer.pdfIn PDF document text
    • https://s3.amazonaws.com/bivanud/hampton_university_museum_address.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dc41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC41 1872 bytes
SHA-256: 31c540d11144f4345156f451af9ba389a1131d21873ea1c3280cece25ef53112
font_01_sfnt_off0000e535.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE535 5356 bytes
SHA-256: 1d72dae7f45a340c003111f8a79a7d9773e22bf574b366e604a69d87d81a7c1b
font_02_sfnt_off0000f74a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF74A 11080 bytes
SHA-256: eeef9c0009a97220cdb47fe3b598405f5d5ef00f9b463d3c7ef96507a13aea49
font_03_sfnt_off00011d09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D09 16100 bytes
SHA-256: dbe3dd64dc066f428802739f18684eaf08c446fcda8cbe88d420f1ef9ee6b29b

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