Malicious PDF — malware analysis report

Static analysis result for SHA-256 5cb29b9e07af00b6…

MALICIOUS

PDF

67.0 KB Created: 2021-02-23 12:54:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: a2c07b16aa08b8113cb5ec7d266059be SHA-1: 10a05db5cb2574c33bb684814f5749e0abc77471 SHA-256: 5cb29b9e07af00b61ad7f349719e1dd980dc79f14056d9f464672a59403eeb8d
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of external links, many of which are structured to appear as search results for academic books, a common lure for phishing or malware distribution. The primary malicious URL, 'https://baarspo.ru/strik?...', is likely used to serve a second-stage payload. The ML classifier and ClamAV detection strongly indicate malicious intent.

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://baarspo.ru/strik?utm_term=james+stewart+calculus+7th+edition+early+transcendentals+book PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4369173/normal_601481564a305.pdfIn PDF document text
    • https://jisevudes.weebly.com/uploads/1/3/4/8/134882916/fc2cd200b6308.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4418001/normal_5fedc8c60759d.pdfIn PDF document text
    • https://damajarulapo.weebly.com/uploads/1/3/0/7/130738748/2759563.pdfIn PDF document text
    • https://cdn.sqhk.co/motulobugaji/jauiamU/crystal_islands_10_gems.pdfIn PDF document text
    • https://cdn.sqhk.co/waxobakal/9rgjzii/eagle_robot_car_game_formula_car_robot_games.pdfIn PDF document text
    • https://cdn.sqhk.co/kulobibab/hclghjN/color_words_in_spanish_worksheet.pdfIn PDF document text
    • https://kelogukagikuval.weebly.com/uploads/1/3/0/7/130739039/gisejirapegazox.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367304/normal_600db70b0b325.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/tumasun/6181404816.pdfIn PDF document text
    • https://s3.amazonaws.com/gotenukevepunin/pikoridogeterojijaden.pdfIn PDF document text
    • https://s3.amazonaws.com/jijari/fumexewajijodom.pdfIn PDF document text
    • https://s3.amazonaws.com/mevuzokekenojab/watch_romeo_and_juliet_1996_online_free_hd.pdfIn PDF document text
    • https://s3.amazonaws.com/suximawo/13707256452.pdfIn PDF document text
    • https://s3.amazonaws.com/fedufiporara/everstart_3_amp_battery_charger_and_maintainer.pdfIn PDF document text
    • https://s3.amazonaws.com/fifomi/edit_file_free_software.pdfIn PDF document text
    • https://s3.amazonaws.com/vawoginele/barcode_in_excel_sheet.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c952.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC952 5644 bytes
SHA-256: 35e273342372f9489e4781db5a0cfb493560766de9562515700f03b18a6bbe05
font_01_sfnt_off0000dc74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC74 9960 bytes
SHA-256: 84fc4d39c693454e84e3700f2af6084d2cee94ef9216c974f956b1ce95c5ef82

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