Malicious PDF — malware analysis report

Static analysis result for SHA-256 6bd9ad8b311b0316…

MALICIOUS

PDF

74.2 KB Created: 2021-09-12 14:36:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 31984f8b9c32cc22e362a28f9508de1e SHA-1: deefa1f152f463e8a60c10a842378db4709d724c SHA-256: 6bd9ad8b311b0316d78dbe507eb846038707df5b070d5a11c2356c2655e31b4e
126 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document is a link farm on disposable hosting, with numerous external URIs pointing to potentially malicious content. While no scripts were explicitly extracted, the nature of link farms and phishing lures suggests potential for JavaScript execution or exploitation to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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 http://ewtch.com/upload/files/31347283631.pdf In PDF document text
    • http://homeopathyhongkong.org/files/xamiwisopisolevajaj.pdfIn PDF document text
    • http://rund.cz/UserFiles/File/5456121785.pdfIn PDF document text
    • http://cuboni.com/uploadfile/hong202109022344274142.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613c972eb9eeb---kujar.pdfIn PDF document text
    • https://dogathermalhotel.com/resimler/files/sapewobodovalidonogojemiv.pdfIn PDF document text
    • https://pecsikult.hu/files/file/27334291854.pdfIn PDF document text
    • https://wecareprogram.org/images/file/50084186547.pdfIn PDF document text
    • http://vako.vn/app/webroot/uploads/files/guwowe.pdfIn PDF document text
    • http://sk4education.com/ckfinder/userfiles/files/48911354813.pdfIn PDF document text
    • http://worldplastsolution.com/ckfinder/userfiles/files/jovenawoxozenalisavoto.pdfIn PDF document text
    • https://growyourmoney.in/userfiles/files/11550651497.pdfIn PDF document text
    • http://xn--djr00fsyfv0o5qgy9u.net/filespath/files/20210905122518.pdfIn PDF document text
    • http://olynskiconstruction.com/pics/file/77013088644.pdfIn PDF document text
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/fej0ttf9mt7frltcjq82ce5l7q/62764867753.pdfIn PDF document text
    • http://aaronandanthony.com/userfiles/files/muxurojesovekipo.pdfIn PDF document text
    • http://etkindenetim.com/resimler/files/90472998392.pdfIn PDF document text
    • https://belitour.ir/basefile/belitourir/files/ruvafokedakoregaluwiteno.pdfIn PDF document text
    • http://mofrantech.com/userfiles/file/1774412796.pdfIn PDF document text
    • http://rancholasmonturaspremios.com/campannas/file/jaxupusezenozimujumuvo.pdfIn PDF document text
    • http://studiocalcinoni.com/userfiles/files/45842328144.pdfIn PDF document text
    • http://sasolution.kr/userfiles/file/tosudobozi.pdfIn PDF document text
    • https://anaksemut.com/contents/files/73543769488.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=coc+th9+farming+strategyPDF 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_off0000bf51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF51 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d763.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD763 16420 bytes
SHA-256: a1727fdc286575f69c177afb9f06d11244bb732ddd6fb252d7a8d81e74344458
font_02_sfnt_off00010197.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10197 11052 bytes
SHA-256: 30414ad4d917a16c8ca9adc8b03200b017ecf040322cf878eda98eb62dc6ec08