Malicious PDF — malware analysis report

Static analysis result for SHA-256 69fd308a25ec1e18…

MALICIOUS

PDF

74.8 KB Created: 2021-09-11 03:54:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b13f70d96f342c408e131eb5d99afff6 SHA-1: d71b952806969d3b0c0446c026931b593a968149 SHA-256: 69fd308a25ec1e188a8fb4aab9d6fecb5f0e5342bc89b546e813ce39397f8c9d
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains embedded JavaScript, which is a common technique for executing malicious code. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a large number of links to potentially disposable domains, suggesting a phishing or spamming campaign. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://szabobuszrendeles.hu/files/files/3490131076.pdf In PDF document text
    • http://cu-hinothai.com/ckfinder/userfiles/files/20608659047.pdfIn PDF document text
    • http://bodegaadrover.com/userfiles/imagenes/bevopazuwiripatakesesaga.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16132558be38bb---nagunux.pdfIn PDF document text
    • http://anthonyjcincottalaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/ruxene.pdfIn PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613912cbc6619---83856144212.pdfIn PDF document text
    • https://crownprolaw.cn/userfiles/Proj_Name/files/rosax.pdfIn PDF document text
    • http://euhoca.com/js/ckfinder/userfiles/files/xegukagemulokukakagala.pdfIn PDF document text
    • http://globalcenterhotels.com/bot/ckfinder/uf/files/8204342548.pdfIn PDF document text
    • https://aymexco.ro/ckfinder/userfiles/files/94907819660.pdfIn PDF document text
    • http://finalstage.biz/js/upload/files/gufudagolikizowefekodeg.pdfIn PDF document text
    • https://transturist.ba/ckeditor/ckfinder/files/files/polekeduvo.pdfIn PDF document text
    • http://gianenricofabro.com/userfiles/files/tanopefekupotuzax.pdfIn PDF document text
    • http://uslugi-ogrodnicze.pl/pliki/File/vunigivuxodonirewumokakim.pdfIn PDF document text
    • http://usagimatur.com/files/others/43306828687.pdfIn PDF document text
    • http://solemarservizi.it/userfiles/files/41131932264.pdfIn PDF document text
    • http://tcsm62.org/uploads/news/file/wowidajawi.pdfIn PDF document text
    • http://maychebiengoduykhuong.com/media/ftp/file/67450194122.pdfIn PDF document text
    • http://melabo.com/upload/files/vukufusulexigag.pdfIn PDF document text
    • http://amblesidewindermere.ca/fckuploads/images/file/82386623750.pdfIn PDF document text
    • http://klawiatury-foliowe.pl/_data/file/nedojifozikapadeluweke.pdfIn PDF document text
    • http://www.museopizarra.com/ckfinder/userfiles/files/jawokuvedorelam.pdfIn PDF document text
    • https://mvpartners.be/images/uploadedimages/file/97171922002.pdfIn PDF document text
    • http://brenno-tojestto.pl/userfiles/file/94689860750.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=one+ui+2.5+a31PDF 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_off0000b820.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB820 20460 bytes
SHA-256: bee4e97118c836e50377a112672f620f5da7e34856a6d735e944dad67f50ef46
font_01_sfnt_off0000ed7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED7A 10236 bytes
SHA-256: e071fb48e0b682b5b6e50d26aedaebb9ac013e029c646c21d483545e5a745de9
font_02_sfnt_off000104b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104B4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1