Malicious PDF — malware analysis report

Static analysis result for SHA-256 f84d54878f6d7047…

MALICIOUS

PDF

81.6 KB Created: 2021-09-12 23:23:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 734c53c8fd4736c9a23fa3704e0622f2 SHA-1: 94bd16b7a22fa31b05e6e1bb39fc611045cb9f2f SHA-256: f84d54878f6d7047ce8b48984b2d4f94c4578ce6450eaac9bfcb591cd99ba6d7
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains embedded JavaScript and numerous external URIs, suggesting it is designed to lead the user to malicious content or download further payloads. The presence of a 'download button' heuristic further supports a phishing or social engineering attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://crabandclaw.com/uploads/files/27977607737.pdf In PDF document text
    • http://kirsanov-maslo.ru/uploads/mitorukiwibunitigewapu.pdfIn PDF document text
    • https://khoahoc.timviec365.com/picturesfiles/wekisi.pdfIn PDF document text
    • https://www.pollackmihalyiskola.hu/ckfinder/userfiles/files/52551000532.pdfIn PDF document text
    • http://pnlestari.com/visitbali/image/files/21908480615.pdfIn PDF document text
    • http://www.sainteuphrasia.com/www/js/ckfinder/userfiles/files/sexabemoxesovikumefidupa.pdfIn PDF document text
    • https://bi-kiesabbau.de/cmsimple/images/file/49484104659.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613813a5a312c---rogawazi.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613461b1dcb8e---suwosogofubigal.pdfIn PDF document text
    • https://piti.leaddeehub.com/userfiles/files/63593372828.pdfIn PDF document text
    • http://rimini-portal.de/bilderarchiv/file/tekid.pdfIn PDF document text
    • http://woodlandhills.ilovepokebar.com/uploads/files/74068978317.pdfIn PDF document text
    • http://adice-area.com/pictures/files/19718696703.pdfIn PDF document text
    • http://www.deewanalarab.com/up_imgs/rezuzubedefowejego.pdfIn PDF document text
    • http://biolabsrl.org/userfiles/files/mewodo.pdfIn PDF document text
    • http://www.awakohchang.com/image/upload/File/6540212367.pdfIn PDF document text
    • http://perechen-izdaniy.ru/js/ckfinder/userfiles/files/zufegubodedodo.pdfIn PDF document text
    • https://xuantruongtech.com/images/ckeditor/files/95240084750.pdfIn PDF document text
    • http://goteneplast.se/files/images/file/42054052746.pdfIn PDF document text
    • https://ewt.cz/res/file/57331057487.pdfIn PDF document text
    • http://ventmetal.ru/userfiles/files/dobaxabifagopujadagofosif.pdfIn PDF document text
    • http://ansatrans.ru/admin/ckfinder/userfiles/files/49920997086.pdfIn PDF document text
    • http://bdsps.org/slbdavbatala/userfiles/file/jumufovowukipewomazenebew.pdfIn PDF document text
    • http://safetruck.gr/images/file/52529391766.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=jumanji+epic+run+modPDF 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_off0000dca7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCA7 10584 bytes
SHA-256: 51fe22e434f74bcbbdf62085f007b8221e96a761d25862a4b5a86e2a7b6da3e5
font_01_sfnt_off0000f4aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4AA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010cbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CBC 16888 bytes
SHA-256: c980edb1d35ddc8b5afee657fbb8dcd964c22d3ae6d6301a78d520b5037f2d0f