Malicious PDF — malware analysis report

Static analysis result for SHA-256 94bb44c557a0939c…

MALICIOUS

PDF

69.1 KB Created: 2021-09-29 08:27:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 29a2edcf348594d3774ab4e70d2cab1b SHA-1: 745b228efdb8be28eb951a9ee058a60b3507ee97 SHA-256: 94bb44c557a0939c061e520005e6dde991c61cf915d7b67e992987efb9e4c7f7
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF is identified as an image-only document designed as a phishing lure, indicated by the 'PDF_IMAGE_LURE' heuristic. It contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm used to distribute malicious content. The ML classifier and ClamAV detection strongly support its malicious nature, likely serving as a dropper or redirector to a secondary malicious payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 0 text block(s), carries a click-outward action, and is only 69 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 http://vitccorp.com/uploads/userfiles/file/9178760268.pdf In PDF document text
    • http://sin-hua.org/userfiles/42169669612.pdfIn PDF document text
    • http://dkyangmei.com/uploadfile/file/2021092223005473499.pdfIn PDF document text
    • http://humanitool.ru/userfiles/file/xilidokimo.pdfIn PDF document text
    • http://johnlillylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/munomiminirusejaxe.pdfIn PDF document text
    • http://pc580.cn/upload_fck/file/2021-9-18/20210918123557906285.pdfIn PDF document text
    • https://imaggu.com/ci/userfiles/files/boxusivo.pdfIn PDF document text
    • http://www.casasemio.com.br/ckfinder/userfiles/files/58351788001.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/tpi6tqlgkau1cic2rnhafi2p51/gazoku.pdfIn PDF document text
    • https://abicecream.ru/ckfinder/userfiles/files/84351024893.pdfIn PDF document text
    • https://ovistar-dz.com/ckfinder/userfiles/files/21497767289.pdfIn PDF document text
    • https://vaynhanh365.net/contents/files/lokuxajazukalalekujutelid.pdfIn PDF document text
    • http://es-manzokudou.com/yamituki-n/uploads/files/33178320480.pdfIn PDF document text
    • https://olamare.com/img/uploaded/file/tazokiparazuxofaw.pdfIn PDF document text
    • http://xn--80aiddhbkcq5bcaz.xn--p1ai/upload/files/tejosanuxidivav.pdfIn PDF document text
    • http://yasaitogo.com/uploads/files/vamekira.pdfIn PDF document text
    • http://ros-audit.com/i/up/file/nagilurarom.pdfIn PDF document text
    • https://bcbc3399.com/upload/files/dowoxaxipipobiliwas.pdfIn PDF document text
    • https://restaurant-kamkok.fr/img/Data/file/54015459497.pdfIn PDF document text
    • https://khanikango.in/file/batev.pdfIn PDF document text
    • https://avukatwebsitesi.kocgrafik.net/upload/files/kuxuzepuwerijipopag.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615056e83d215---redix.pdfIn PDF document text
    • http://alexdisinfestazioni.com/userfiles/files/kafomusofavufukaw.pdfIn PDF document text
    • https://koncnc.com/genelresimler/file/536871154.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=moana+full+movie+free+download+for+android+in+tamilPDF 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_off0000b17c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB17C 13784 bytes
SHA-256: 093b80a562a52483fa533f578ad138036bd7a2d8401061c5470654159944be91
font_01_sfnt_off0000d3c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3C1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ebd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBD8 10592 bytes
SHA-256: 7094f952491f3b01332ed5ab74090df41ad32b17e1641acc6a02b9b6ade9a3e8