Malicious PDF — malware analysis report

Static analysis result for SHA-256 902623dbd83b2e36…

MALICIOUS

PDF

80.5 KB Created: 2021-09-12 05:02:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 195690008377bfcd9a1e9e84582fb043 SHA-1: 4de927b04beb13b116d0c2b955b091b01988ebb6 SHA-256: 902623dbd83b2e3613bf7b851ec774cbf35a832d00bfe185d8c139746b17c43b
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, indicating a link farm or phishing lure. ClamAV and ML classifiers identified this PDF as malicious, specifically a phishing trojan. The presence of external URIs and the 'link farm' heuristic suggest the primary goal is to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://ingore.cn/upload/files/11655340260.pdf In PDF document text
    • http://szyqjsj.com/UploadFile/file/20210908155347479.pdfIn PDF document text
    • http://duef.ru/public/file/zajakugazujokufasamufofav.pdfIn PDF document text
    • http://open.ua/uploads/ckeditor/files/77942779328.pdfIn PDF document text
    • https://safewatersolutions.in/ckfinder/userfiles/files/29842275511.pdfIn PDF document text
    • https://www.tristar-technology.com/ckfinder/userfiles/files/62632385155.pdfIn PDF document text
    • http://millionsdiscount.com/mo_images/files/65096146035.pdfIn PDF document text
    • http://scandirent-new.ru/uploads/assets/file/55372902587.pdfIn PDF document text
    • http://www.siscbolivia.com/admin/uploaded/fck/file/5089399393.pdfIn PDF document text
    • http://dblbtech.com/userfiles/file/99728414921.pdfIn PDF document text
    • https://nutrishop.in/ci/userfiles/files/81558422691.pdfIn PDF document text
    • http://dtmaso.com/public_html/Imagens/file/mufevuriwira.pdfIn PDF document text
    • http://northmarking.com/userfiles/files/97118998594.pdfIn PDF document text
    • http://ruishikaishi.com/upload/content/files/2021/09/20210910191525.pdfIn PDF document text
    • http://vanillasky-ch.com/images/files/loxegimirix.pdfIn PDF document text
    • http://tumwebthailand.com/ckfinder/userfiles/files/doruxe.pdfIn PDF document text
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/s9vse0v3vcvg1pit54ipj3ugp1/20293707170.pdfIn PDF document text
    • http://euromarkcreations.com/new/fck_img/file/kifafojexazo.pdfIn PDF document text
    • http://alcantara.cz/data/file/revafejatiweworonebalo.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d088891235---52403003088.pdfIn PDF document text
    • http://landpas.pl/upload/file/58590310322.pdfIn PDF document text
    • https://pinkrali.com/calisma2/files/uploads/74283868773.pdfIn PDF document text
    • http://shijijiaming.cn/filespath/files/20210902220438.pdfIn PDF document text
    • http://sun-green.be/ckfinder/userfiles/files/malogebufeposuzavol.pdfIn PDF document text
    • https://topupdana.com/contents/files/vaxuxeletugep.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=how+to+recover+sd+card+in+mobilePDF 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_off0000d5bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5BB 17596 bytes
SHA-256: a7c511d496bba9ca1eff1cf0de54e5c1dba084540c416129914a12934b8bb1c5
font_01_sfnt_off00010348.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10348 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011b5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B5F 10816 bytes
SHA-256: c4b641190402b87fb6c76c092f4cc08d3ef296aa65f8e82c480a22a37ba19cb7

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