Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a5fd3e2ee8ebd22…

MALICIOUS

PDF

88.4 KB Created: 2021-09-10 20:48:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: c1bd0ebb61f442e714b39a2e21335005 SHA-1: 3fe5c7ffd85c21ccc4b4eefb5d98a4c557f7f90d SHA-256: 3a5fd3e2ee8ebd22a22a86d47112b9c26832b97cf9fa71336ee22adc109ac9a8
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript and numerous external URIs, suggesting it is designed to redirect users to potentially harmful websites. The PDF's structure and the presence of JavaScript point towards an attempt to exploit vulnerabilities or deliver further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://queure.ru/uplcv?utm_term=sultan+full+movie+salman+khan+online PDF link annotation
    • http://gr-chem.com/upload/files/50576371332.pdfIn PDF document text
    • http://deltools.com/userfiles/file/54073703143.pdfIn PDF document text
    • http://01host.ru/userfiles/files/zusasup.pdfIn PDF document text
    • https://chung-pei.com/userfiles/file/16478135265.pdfIn PDF document text
    • https://serka.com/serka/upload/files/fomobisurubejazodeterik.pdfIn PDF document text
    • https://lensmam.com/userfiles/file/tefaxipelikedetolufaz.pdfIn PDF document text
    • https://probidjp.com/ckfinder/userfiles/files/20210901_052107.pdfIn PDF document text
    • https://cryptobasics.biz/uploads/files/11543162426.pdfIn PDF document text
    • http://pribatu.lamilagrosaimport.com/images/files/kojirisinub.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135953e68e88---binukazowebobaja.pdfIn PDF document text
    • http://hujiangsy.com/upload/files/79815242413.pdfIn PDF document text
    • http://studiocariola.com/userfiles/files/madafawudatud.pdfIn PDF document text
    • http://gesgo.de/userfiles/file/solibibigisupa.pdfIn PDF document text
    • https://tainandentist.com/uploads/files/202109022214275971.pdfIn PDF document text
    • https://safrano.pl/userfiles/file/59384690103.pdfIn PDF document text
    • http://zs-g.jp/app/webroot/js/ckfinder/userfiles/files/80032008894.pdfIn PDF document text
    • http://eksternest.be/images/file/xufivajajodu.pdfIn PDF document text
    • http://ccforum.kr/uploads/file/1630562002.pdfIn PDF document text
    • http://totoumi.jp/upload/file/ruwujolid.pdfIn PDF document text
    • http://movesearchesuk.com/userfiles/file/fubupizufogakimawodofiled.pdfIn PDF document text
    • http://ntouioc.ntou.edu.tw/ckfinder/userfiles/files/24709309386.pdfIn PDF document text
    • http://xn--9p4b29dncp2cc6y.net/upload/fckeditor/file/37234742838.pdfIn PDF document text
    • http://adas-muko.pl/photo/file/8469169082.pdfIn PDF document text
    • http://alessandrotria.altervista.org/areap/ckfinder/userfiles/files/69402018823.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://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_off0000f09d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF09D 10712 bytes
SHA-256: 1c9200342b67ff2f44e6541d2a5cc58d6242c982077798cb6265ca4f10f5319a
font_01_sfnt_off00010906.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10906 19140 bytes
SHA-256: df291d84193dec9db85d8517a14ca2958925560d51d4a9dc42a2e08cd9d2b396
font_02_sfnt_off00013b96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B96 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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