Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ab05836b575569a…

MALICIOUS

PDF

68.0 KB Created: 2021-09-24 14:37:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 3f085c60f8e965b0b64edf3db88403d7 SHA-1: 29fe5f592db66c9f11458c0f9da967bd5ff23c81 SHA-256: 9ab05836b575569a55518dbfb1c85b4bf95100c7e72b67a75e5bd060dec7be30
146 Risk Score

Malware Insights

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

The PDF exhibits characteristics of a phishing lure, including an image-only presentation and embedded links to external websites. Heuristics indicate it's a link farm on disposable hosting, suggesting a campaign to distribute malicious content or phish for credentials. The ML classifier and ClamAV detection strongly indicate malicious intent, likely involving the execution of embedded JavaScript or redirection to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 1 text block(s), carries a click-outward action, and is only 67 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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.
  • 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://archism.ru/uplcv?utm_term=android+usb+driver+windows+10 PDF link annotation
    • http://cungcapbaoduongcuanhatban.com/upload/files/37291306051.pdfIn PDF document text
    • https://xn--fct8ml6mwue.tw/uploads/files/70229378182.pdfIn PDF document text
    • https://nada70.org/userfiles/file/jiboliwubawajibapavoduvi.pdfIn PDF document text
    • http://sattosushi.com/uploads/files/37811926049.pdfIn PDF document text
    • https://tabularasa.lv/sites/tabularasa/uploads/documents/files/vizanasuvofexel.pdfIn PDF document text
    • https://xyoaa.org/sites/default/files/files/lazevorova.pdfIn PDF document text
    • http://rrbrentacars.com/files/others/85261145315.pdfIn PDF document text
    • http://www.huntsvillepr.com/files/files/87411825051.pdfIn PDF document text
    • https://kaxtongroup.com/home5/maxconne/public_html/kaxtongroup/assets/images/newspostimages/files/winigotutufovedijesa.pdfIn PDF document text
    • http://djpress.pl/Image/files/tuvejipibeziwulalomeveruw.pdfIn PDF document text
    • http://luxmeterthai.com/ckfinder/userfiles/files/gebixodatotukutimipomuz.pdfIn PDF document text
    • https://ryokanclub.com/FileData/ckfinder/files/20210921_B2CFB01C8E77ACB3.pdfIn PDF document text
    • http://www.sosonomo.com/ckfinder/userfiles/files/vetipifekarifojejanofafi.pdfIn PDF document text
    • https://magazinul-de-instalatii-sanitare.ro/app/webroot/files/userfiles/files/16344393568.pdfIn PDF document text
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/16147cf3b5aa2a---1996665655.pdfIn PDF document text
    • https://sitycare.com/FCK-UserFiles/files/37426887951.pdfIn PDF document text
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/5b155507261627a495f2759cc8b06b6f/zowelakujixod.pdfIn PDF document text
    • https://sitpchemcieszyn.pl/_sitpchem/file/mamadutanugeroxoro.pdfIn PDF document text
    • https://castilloexterior.es/ckfinder/userfiles/files/tutasa.pdfIn PDF document text
    • http://congtrinhnhaviet.vn/upload/files/46955110721.pdfIn PDF document text
    • https://norservis.info/files/files/misewoji.pdfIn PDF document text
    • http://clainvest.pl/userfiles/file/bezubox.pdfIn PDF document text
    • 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_off0000ae6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE6D 14340 bytes
SHA-256: 849474cf6e53dfd93b7c391e536f28cbe5eea2e9d267335fa517cf12da1f2b73
font_01_sfnt_off0000d269.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD269 10484 bytes
SHA-256: 98c4bdaeea1fa8bf8ccebdbf85454892feeb4e6b37743170478ef1aa5d88e791
font_02_sfnt_off0000ea76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA76 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1