Malicious PDF — malware analysis report

Static analysis result for SHA-256 87fbd68b2c1241e2…

MALICIOUS

PDF

81.2 KB Created: 2021-09-12 12:16:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 2cdc295d131703e8ca7c8bca9f812e80 SHA-1: c4833589dbaa5643893c92eb7fe032175a13397c SHA-256: 87fbd68b2c1241e239fc0a697e89183880d73cc51671d3dd4d195e74d5b0293a
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many of which point to potentially malicious domains hosting PDF files. The presence of a 'download button' heuristic further suggests a lure to download a payload. ClamAV detection as 'Pdf.Phishing.Trojan' strongly indicates malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://webkapper.nl/ckfinder/userfiles/files/maxoletatuba.pdf In PDF document text
    • https://skvacations.com/userfiles/file/voliguwifage.pdfIn PDF document text
    • http://xinchenfast.com/upload/file/2050458612.pdfIn PDF document text
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/bcd0e4d273c3e9d164570ecc4d4d314e/62903599619.pdfIn PDF document text
    • https://nichecnk.leaddeehub.com/userfiles/files/72907179154.pdfIn PDF document text
    • http://letnipohar.cz/upload/file/labazumajexulozuviruw.pdfIn PDF document text
    • https://hotelangela.hu/userfiles/file/tamemikodalipil.pdfIn PDF document text
    • http://chandravanshi.com/userfiles/file/lobuxexudezu.pdfIn PDF document text
    • https://bjjewels.net/nbloom/fckuploads/file/13663541583.pdfIn PDF document text
    • http://cuboni.com/uploadfile/hong202109091615135911.pdfIn PDF document text
    • http://alfadent-volg.ru/images_uploads/files/97163742469.pdfIn PDF document text
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/dl61i55i5a3mfismmvuio6rbsr/46005696279.pdfIn PDF document text
    • http://lex.tj/img/file/36012304100.pdfIn PDF document text
    • https://aodaixuan.vn/app/webroot/upload/image/files/37622883837.pdfIn PDF document text
    • http://pazzo.jp/js/upload/files/53653956110.pdfIn PDF document text
    • http://casier-a-bouteilles.com/file/kuferefutedus.pdfIn PDF document text
    • https://gilbertems.com/videos/file/vujikefabuvopazefalosidis.pdfIn PDF document text
    • http://dymenahealthcare.com/upload/fckeditor/file/14917943815.pdfIn PDF document text
    • http://uteambio.com/upload/files/94129072783.pdfIn PDF document text
    • https://toananhmedical.com/uploads/files/nifugitubo.pdfIn PDF document text
    • http://cheniou.handysociality.com/upload/files/sisapetixoj.pdfIn PDF document text
    • http://www.premiumimport.nl/ckfinder/userfiles/files/23419004792.pdfIn PDF document text
    • https://ipssecurityconsultants.com/ckfinder/userfiles/files/43171433672.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=john+wick+subtitles+downloadPDF 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_off0000d030.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD030 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e847.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE847 10776 bytes
SHA-256: e1ae6a8d322672ec0da5210ddad0eb6423f58b2c16650952d1abc8c9545e2345
font_02_sfnt_off00010121.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10121 20960 bytes
SHA-256: 01774d0046fccb59df56ee8b66892b0056a77f35357cc1fb31400532738ef239