Malicious PDF — malware analysis report

Static analysis result for SHA-256 d884fe0a988cf055…

MALICIOUS

PDF

84.0 KB Created: 2021-09-13 22:26:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: bb347f81108e2b0a0c3b1c3665b9d232 SHA-1: 62b3bf3a3e9543b6c0ad6c54f908eb8a7d9fdb75 SHA-256: d884fe0a988cf05524a4d2dfb3213c2ed82c416c504150e06ee3b24b10c373cd
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious. It contains embedded JavaScript, which is a common technique for executing malicious code within PDFs. The presence of numerous external URIs, many pointing to potentially disposable domains, suggests a link farm or redirection mechanism designed to lead users to malicious content. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a large number of links on disposable hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://mzr-avocats.com/buddha/ckfinder/userfiles/files/86208051609.pdf In PDF document text
    • http://www.cerel.eu/images/wyswig_images/file/pugafanuvinatefo.pdfIn PDF document text
    • https://kfk-dekoration.dk/images/uploadedimages/file/sosipidavuv.pdfIn PDF document text
    • http://garage-ys.info/js/upload/files/bolaxifusepa.pdfIn PDF document text
    • http://tianlanip.com/filespath/files/20210902134552.pdfIn PDF document text
    • https://topclassgardening.nl/images/file/77917302883.pdfIn PDF document text
    • http://randygordonlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/gogimefofikowupipidopu.pdfIn PDF document text
    • https://tucarrorentacar.co/ckfinder/userfiles/files/52179963809.pdfIn PDF document text
    • http://bookblog.kr/data/file/files/rafevenelaji.pdfIn PDF document text
    • https://z87992961.com/upload/files/20210909090010.pdfIn PDF document text
    • http://pp-aqua.com/userfiles/files/vugized.pdfIn PDF document text
    • http://frickcontrols.com/uploads/files/21061262359.pdfIn PDF document text
    • http://zvaracskaskola.eu/editor_uploads/system/files/67792778152.pdfIn PDF document text
    • http://dermalab.pl/userfiles/file/besonudekanejalaj.pdfIn PDF document text
    • http://lerucherdesanges.fr/userfiles/file/7384733345.pdfIn PDF document text
    • https://goldfieldssanddrags.com.au/ckfinder/userfiles/files/51158496093.pdfIn PDF document text
    • https://mosaicopeoplecorporation.com/ckfinder/userfiles/files/34275391914.pdfIn PDF document text
    • http://www.gpe-el.pro/ckfinder/userfiles/files/romakefidopubom.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136581a6a4c1---fulopomurivipazufigos.pdfIn PDF document text
    • http://cmrivestimenti.com/userfiles/files/tewozu.pdfIn PDF document text
    • http://ateliergermain.net/sites/default/files/file/mozedopus.pdfIn PDF document text
    • https://bengalroys.com/ckfinder/userfiles/files/93287628001.pdfIn PDF document text
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/1613baf7916a33---23521448911.pdfIn PDF document text
    • http://orosweb.hu/userfiles/file/vosovadutofarojotaxijine.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=head+soccer+hack+macPDF 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_off0000e500.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE500 18020 bytes
SHA-256: 1cd12d5fa50135f76751388dabb9b1e47f9f47969377e57bd46484ab4736dffd
font_01_sfnt_off00011381.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11381 10376 bytes
SHA-256: f4d6c736f994eb1be3c0c19f78194a68fcd35d3db35452fcdee73d2342ca3e67
font_02_sfnt_off00012aed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1