Malicious PDF — malware analysis report

Static analysis result for SHA-256 1aea956ae2c2e384…

MALICIOUS

PDF

69.3 KB Created: 2021-09-25 06:09:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 3752a1b40dabe52db51b711fdbad15a3 SHA-1: 136606e39b242821f10aad3741bec4a1a7851682 SHA-256: 1aea956ae2c2e384f4321ed6e9c8d2271eb96c757fb32bfa49cb7771c02d6762
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was identified as malicious by ML classifiers and ClamAV, exhibiting characteristics of a phishing lure. The 'PDF_IMAGE_LURE' heuristic indicates it's an image-based document designed to trick users into clicking an embedded action trigger. Numerous URLs were extracted, many pointing to disposable domains, suggesting a link farm or redirection mechanism for delivering malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9936

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 https://matraci.info/UserFiles/File/zasibagejorom.pdf In PDF document text
    • https://biogenetixpharma.com/ci/userfiles/files/ranigozusuwikujusejiba.pdfIn PDF document text
    • https://kuraniterbiye.com/resimler/files/32889638888.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/zinoto.pdfIn PDF document text
    • http://aquamedia.cn/ckfinder/userfiles/files/beneruxo.pdfIn PDF document text
    • https://usgcambodia.com/userfiles/file/penubuzisaw.pdfIn PDF document text
    • https://foodbiz.bdata.link/upload/files/98065816883.pdfIn PDF document text
    • http://moriefrusca.com/userfiles/files/vitasiterilalofute.pdfIn PDF document text
    • http://kimura-shihoshoshi.com/userfiles/file/87887896045.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f0f54874dc---tadiboxek.pdfIn PDF document text
    • http://calisnt.com/uploads/files/91580135403.pdfIn PDF document text
    • https://kimcert.net/E/file/wukiziwuvirix.pdfIn PDF document text
    • http://muasamhangmy.com/ckfinder/userfiles/files/vafufavisolisalu.pdfIn PDF document text
    • http://hkacca.com/userfiles/32955830918.pdfIn PDF document text
    • https://grandhotelbulgaria.com/userfiles/file/dowitilokizogigulusit.pdfIn PDF document text
    • http://celyroknaterase.sk/editor_uploads/system/files/78665876982.pdfIn PDF document text
    • https://angelsolutions.ro/ckeditor/ckfinder/userfiles/files/89027734530.pdfIn PDF document text
    • https://haruhonpo.com/upload/haruhonpo/files/xemofuma.pdfIn PDF document text
    • http://ecovn.vn/uploads/news_file/lopugaxavogeginagisafexog.pdfIn PDF document text
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/22723c572d414328377b2e59e6268bcb/rudiwapabiguzajinubomono.pdfIn PDF document text
    • http://www.hgbehringer.de/img/files/files/zibeliduxawu.pdfIn PDF document text
    • https://arabadvertise.com/userfiles/files/3443217456.pdfIn PDF document text
    • http://mrtowing.ca/Lawyers/userfiles/file/18440787344.pdfIn PDF document text
    • https://arrad.ch/modules/ck/ckfinder/userfiles/files/656286279.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=watch+bend+it+like+beckham+full+movie+123moviesPDF 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://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_off0000b209.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB209 11376 bytes
SHA-256: 2aadc62168d37962fe3b6eb8c783f029338fdfef1cd54fa4efe4ec4ee4e801d2
font_01_sfnt_off0000ccd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCD2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e4e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4E4 14340 bytes
SHA-256: baf21bedf6c5fe9c7a72b81d1a32e554563af06414eb3933af709c6b1ce554c9