Malicious PDF — malware analysis report

Static analysis result for SHA-256 299b3766b1990d50…

MALICIOUS

PDF

82.6 KB Created: 2021-09-09 15:37:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 4d512b2112d121a2042f80c2fc2c1df2 SHA-1: 0574068d82dab216da83d0089bde49160f19099f SHA-256: 299b3766b1990d50913a983e935495d2af5e174d4453095392db4ebb6f0dd0f5
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to potentially malicious or unknown domains, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports the interpretation of this PDF as a mechanism to redirect users to external, potentially harmful, content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/5c022e6e53d9df10e661e0d0aa6604c3/31025520086.pdf In PDF document text
    • http://greenworx.eu/images/uploads/files/sopokerutu.pdfIn PDF document text
    • https://goodline.by/userfiles/file/32003245984.pdfIn PDF document text
    • http://flemingdecal.com/uploads/assets/file/vokogipadaji.pdfIn PDF document text
    • http://littlepearlspublishing.in/data/eimages/file/61451582003.pdfIn PDF document text
    • http://web-news.eu/www/pkpar/userfiles/file/86330827579.pdfIn PDF document text
    • https://newegys.egyseg.eu/ckfinder/userfiles/files/16405773260.pdfIn PDF document text
    • http://zhuxintrading.com/uploads/ckfinder/files/20210904/16307139258189.pdfIn PDF document text
    • http://www.pantonerestauri.com/ckfinder/userfiles/files/nugezesidabeburu.pdfIn PDF document text
    • https://thietbivesinhsonhoa.com/webroot/img/files/29552528665.pdfIn PDF document text
    • http://papaicountrylodge-longstay.com/user_img/files/54704876395.pdfIn PDF document text
    • https://calmoinc.com/upload/editor/file/58936432335.pdfIn PDF document text
    • http://myxroad.net/upload/userfiles/file///modudigo.pdfIn PDF document text
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/d36ca2188266595d756b7e306f853b2c/60469894332.pdfIn PDF document text
    • https://wsbe17hongkong.hk/_bin/ckfinder/userfiles/files/577724762.pdfIn PDF document text
    • http://onlinecommerce.bg/uploads/pages/files/ketamemupogalokekisika.pdfIn PDF document text
    • http://technology-mp.it/userfiles/files/bufufotetomewopa.pdfIn PDF document text
    • http://versobrokers.eu/userfiles/files/92396658470.pdfIn PDF document text
    • http://connect-event.fr/ckfinder/userfiles/files/56499873189.pdfIn PDF document text
    • http://lsphc.com/userfiles/file///91198675769.pdfIn PDF document text
    • https://www.rapn.ru/ckfinder/userfiles/files/79036200447.pdfIn PDF document text
    • http://sys-svinding.dk/userfiles/file/63782121343.pdfIn PDF document text
    • http://moneymaker-gold.de/files/20954244268.pdfIn PDF document text
    • https://matao.ro/app/webroot/files/userfiles/files/28064451936.pdfIn PDF document text
    • http://labsshop.com/d/files/texofazu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=external+keyboard+helper+pro+apkPDF link annotation
    • 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dbb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBB6 18336 bytes
SHA-256: d197692e8f679084b4f644fa77b298c8150b6b9ac28a2cbab72d73ae731ff6d1
font_01_sfnt_off00010c73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C73 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001248a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1248A 10660 bytes
SHA-256: 5fbb6bfc24922606614001c7b9a73c8b557f8f9b30de3a46dd4e6d30a278598c