Malicious PDF — malware analysis report

Static analysis result for SHA-256 084cd58fe621da6e…

MALICIOUS

PDF

69.3 KB Created: 2021-10-04 10:48:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 31372f5aff36bdffe549e1a99af5cb7b SHA-1: 3f2db63f24aca42fe5d2f3b0224baab86a82a3bf SHA-256: 084cd58fe621da6ef4a3bf5ac3ad7c5d5706a4e03ea38eb928829414239285e1
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF is identified as a phishing lure due to its image-only nature and embedded clickable link. The heuristic 'PDF_IMAGE_LURE' indicates a common tactic where a screenshot is used to hide a malicious link. The numerous extracted URLs, many hosted on disposable domains, further support a phishing or credential harvesting campaign. Although no scripts were explicitly extracted, the PDF structure itself likely contains JavaScript to trigger the URI redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://smidgel.ru/uplcv?utm_term=subtraction+of+fractions+worksheets+with+answers PDF link annotation
    • https://standsimulator.com/ckfinder/userfiles/files/80948022923.pdfIn PDF document text
    • http://ivelinabozilova.com/userfiles/file/92366573756.pdfIn PDF document text
    • https://travelsafeway.com/userfiles/file/43659861869.pdfIn PDF document text
    • http://barcelonasixtytwo.com/userfiles/file/5512384349.pdfIn PDF document text
    • http://likuidart.com/files/ckeditor/files/8306767325.pdfIn PDF document text
    • http://unewstoday.com/task/userimages/file/46410064985.pdfIn PDF document text
    • http://xn--dlek-5qa.com/admin/UserFiles/file/manesemuvaxubilax.pdfIn PDF document text
    • https://sahyadrisevasanstha.in/userfiles/file/15614833269.pdfIn PDF document text
    • https://gresathouse.com/wp-content/plugins/super-forms/uploads/php/files/c7712101a4d249e535e355c837009e5e/12765130515.pdfIn PDF document text
    • https://perfecthospitals.org/FCKeditor/file/mazafanokurilowenitigidin.pdfIn PDF document text
    • https://infypos.com/infyposcms/media/mopisafunofig.pdfIn PDF document text
    • http://emblem4home.com/UserFiles/Member/File/biwejerepimu.pdfIn PDF document text
    • https://tomas-music.com/contents/files/xafivanerodugokej.pdfIn PDF document text
    • https://ontogepszerviz.hu/editor_up/7609039474.pdfIn PDF document text
    • http://netflor.pl/upload/File/17686241458.pdfIn PDF document text
    • https://takipcisec.com/calisma2/files/uploads/91442611953.pdfIn PDF document text
    • http://fotografoenricogiampieri.it/userfiles/files/winalesawokize.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/1615a4ac754bdd---59153234352.pdfIn PDF document text
    • http://dgelc.com/userfiles/file/20210929195214.pdfIn PDF document text
    • https://pearproperties.in/userfiles/file/botadonuma.pdfIn PDF document text
    • https://lbk-ingatlan.hu/uploads/file/bumegubolinozarik.pdfIn PDF document text
    • https://www.fyna.com.au/application/third_party/ckfinder/userfiles/files/tudoravel.pdfIn PDF document text
    • http://dotbamboo.com/file_media/file_image/file/20120399161.pdfIn PDF document text
    • https://tamphuctriland.vn/upload/files/32792052746.pdfIn PDF document text
    • http://aucoindeshalles.fr/menu/file/5503383777.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_off0000b354.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB354 13788 bytes
SHA-256: 48ef3747f123724cf0472138c913c40326e65c5c4da9c68870e767a0990f9165
font_01_sfnt_off0000d5be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5BE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000edd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDD5 10880 bytes
SHA-256: 05926df9541e3d50a76925017c10667a8811258411b0afe13c6c009cce3f2778