Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9a20fed64d15f1f…

MALICIOUS

PDF

79.6 KB Created: 2021-09-23 01:21:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 9c4d353b4666cac7a01252efbda5f7ef SHA-1: 06de823ab45b1826068813aa8abc10c0c2cbdd0f SHA-256: a9a20fed64d15f1f2bd62de806d9d951e8ab3e5e69ef7b0c70f67e3921b7d9b5
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of a specific lure for 'gta 6 apk download' indicates a phishing or scam attempt. ClamAV detection and ML classification further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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 http://christ-china.com/filespath/files/20210916154406.pdf In PDF document text
    • http://chetaomaynganhnhua.com/uploads/files/88787946086.pdfIn PDF document text
    • http://laboratoriodiprogettazione-ve.it/userfiles/files/garejo.pdfIn PDF document text
    • https://mongolia-volkslift.com/uploads/files/89454250621.pdfIn PDF document text
    • http://ski-experience-japan.com/images/blog/file/razunesixosu.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/161396f4600cf2---99149145397.pdfIn PDF document text
    • https://www.supremecaravans.com.au/application/third_party/ckfinder/userfiles/files/35300841150.pdfIn PDF document text
    • https://hawkseyetravels.com/assets/ckfinder/userfiles/files/zanaki.pdfIn PDF document text
    • https://2ruoteexpo.it/ckfinder/userfiles/files/soduzepemomaji.pdfIn PDF document text
    • https://atlastoursntravels.com/userfiles/file/xalozupedizuzefidemiviru.pdfIn PDF document text
    • https://hattoco.vn/images/ckeditor/files/80992389280.pdfIn PDF document text
    • https://baust.edu.bd/app/webroot/ckfinder/userfiles/files/dedepofefogezemazapumemo.pdfIn PDF document text
    • https://edinburghpools.com/contents/files/95571557005.pdfIn PDF document text
    • https://biholka.cz/uploades/userfiles/file/25875098517.pdfIn PDF document text
    • http://chothuexehochiminh.com/userfiles/file/62079972332.pdfIn PDF document text
    • http://battlegrouponline.com/app/webroot/js/ckfinder/userfiles/files/73168465336.pdfIn PDF document text
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/n5q2lvv3hc2eg025e0n4kfgi47/94568718271.pdfIn PDF document text
    • https://needlugs.com/userfiles/files/41660725675.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e9a4cab6f1---wapexemiwepudadabapuzep.pdfIn PDF document text
    • https://alpinashop.bg/files/sipatinazegopofavadakik.pdfIn PDF document text
    • http://angelascanu.it/uploads/file/75008691026.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=gta+6+apk+download+for+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://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_off0000d2d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2D3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eae5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAE5 17476 bytes
SHA-256: c77ad9c908281b2b70bcace708c7690e62590d118959f16116cf09978842205d
font_02_sfnt_off00011853.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11853 10576 bytes
SHA-256: 8b4a23e78fdafc858625252d2880877cabcda5a8faf8e4228378f5fc5f774290