Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ccda006e4fd1604…

MALICIOUS

PDF

99.1 KB Created: 2021-09-17 08:18:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 0422e1c13b609de9e767597b6bda4052 SHA-1: edb632c4dc87b78110b608de1fc85b323627e13b SHA-256: 3ccda006e4fd16048cf0718340d37f5f458de25a607131baadb0a301eda85803
134 Risk Score

Malware Insights

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

The PDF document was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The presence of a link farm with numerous disposable hosts and a deceptive call-to-action button suggests a phishing or malware distribution scheme. While no scripts were directly extracted, the PDF structure and embedded URLs point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9767

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.
  • 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 http://eskuvotoszkanaban.hu/editor_up/tewotogapabegusuna.pdf In PDF document text
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/e66f52c3c6f0f6eeb9287e5f3b9bfca6/mitataxifuximunum.pdfIn PDF document text
    • http://wxeina.com/userfiles/files/64140368919.pdfIn PDF document text
    • https://mudrun.com/home/mud/public_html/ckfinder/userfiles/files/bituwunajiwerigid.pdfIn PDF document text
    • http://verypool.cn/images/upload/File/gibipulimekesoguviros.pdfIn PDF document text
    • https://divinenine.net/userfiles/file/lewanimawozulefusoz.pdfIn PDF document text
    • https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/bfe4ce8f5486fdf6213bc5480672b105/nukovalomami.pdfIn PDF document text
    • http://logenamerica.com/userfiles/file/6799011271.pdfIn PDF document text
    • http://mpu-beratung-brendle.de/userfiles/file/lumoneja.pdfIn PDF document text
    • https://austdoorcaocap.com/upload/files/3928089024.pdfIn PDF document text
    • http://alfonsoguiggiarchitetto.it/userfiles/files/5200856392.pdfIn PDF document text
    • http://www.stemcellhairclinic.com/files/files/xikupogeb.pdfIn PDF document text
    • https://umartravel.com/files/71299410980.pdfIn PDF document text
    • http://sz-nuoyi.com/Upload/file/2021090600574698476.pdfIn PDF document text
    • https://dsverano.com/UserFiles/File/porapegobuxofumutivamilu.pdfIn PDF document text
    • http://waterlootour.com/FileData/ckfinder/files/20210910_F468F87B250FB761.pdfIn PDF document text
    • http://nuklearmedizin-amro.de/userfiles/file/70181652710.pdfIn PDF document text
    • https://skillmapmagazine.com/ckfinder/userfiles/files/17821238236.pdfIn PDF document text
    • http://ijfbn.com/editor_up/27643440743.pdfIn PDF document text
    • https://granitnet.hu/editor_up/89305191345.pdfIn PDF document text
    • https://cjsc.se/ckfinder/userfiles/files/15395918667.pdfIn PDF document text
    • http://ulleungroadtour.com/FileData/ckfinder/files/20210907_C08C07AB55369459.pdfIn PDF document text
    • http://www.videocopilot.net/assets/public/ckfinder/userfiles/files/fawazujiwujit.pdfIn PDF document text
    • https://baigiangtoanhoc.com/upload/files/tubevu.pdfIn PDF document text
    • http://www.hebrewforreadingcomprehension.com/content/79097046792.pdfIn PDF document text
    • http://mabo-meccanica.eu/userfiles/files/73255540102.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=sonic+adventure+on+androidPDF 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://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_off000113e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113E4 10392 bytes
SHA-256: db11abb246a3fb8d99424921ccfebdbee98320f8d2b309a10ec41a8f5f62b4f2
font_01_sfnt_off00012b95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B95 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000143a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x143A7 23952 bytes
SHA-256: 1548cc4ab790840f214c2fbb78e855f3a0112531afc68f6ecd87e493621843e5