Malicious PDF — malware analysis report

Static analysis result for SHA-256 c82d5bda9c885ad9…

MALICIOUS

PDF

72.4 KB Created: 2021-09-27 08:06:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: cd37d43fa050fd5cf8c6a40c525b55da SHA-1: 2a0c2f650631968cbfa17a81efb36017f34eaa39 SHA-256: c82d5bda9c885ad9a34d55d0702c077357abb2c195b7d87591a55b1bc750cf70
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are associated with link farms and disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of techniques used to redirect users to malicious sites, likely for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://pistant.ru/uplcv?utm_term=download+watched+multimedia+browser PDF link annotation
    • http://naim.naparts.com/images/fck/file/retamalu.pdfIn PDF document text
    • https://recrut.com/files/files/wopadelo.pdfIn PDF document text
    • https://avigailpekelman.com/sites/default/files/file/29541499032.pdfIn PDF document text
    • http://avision-italia.com/userfiles/files/xukupe.pdfIn PDF document text
    • http://stagegator.scorchmark.com/stagegator/ckfinder/userfiles/files/momalesakufulomagu.pdfIn PDF document text
    • https://4wheelchile.cl/admin/uploads/file/63079800568.pdfIn PDF document text
    • http://baheth24aqari.com/ckfinder/userfiles/files/95160371218.pdfIn PDF document text
    • http://aromamahabaleshwar.com/ckfinder/userfiles/files/44298914859.pdfIn PDF document text
    • http://www.aragonemprendedor.com/userfiles/files/37315288907.pdfIn PDF document text
    • http://cl-metalparts.com/d/files/84186733854.pdfIn PDF document text
    • http://boothbayharborshipyard.com/userfiles/file/77312788440.pdfIn PDF document text
    • https://autoroman-service.ro/imagini_ws/kepamexukiduxowewelol.pdfIn PDF document text
    • http://doremimarlikinsaat.com/userfiles/file/koxoboxotogi.pdfIn PDF document text
    • https://pezenasenchantee.fr/userfiles/file/kovexam.pdfIn PDF document text
    • http://itineraire-consulting.com/ckfinder/userfiles/files/nonolujiwonasikeweriz.pdfIn PDF document text
    • http://ecohort.com/userfiles/files/992798127.pdfIn PDF document text
    • http://kovovyroba-nosniky.cz/UserFiles/File/madupu.pdfIn PDF document text
    • http://sintellect.ru/Repository/file/96492381320.pdfIn PDF document text
    • https://pointswestliving.com/ckfinder/userfiles/files/vodutijefovunebabisime.pdfIn PDF document text
    • http://glamour-nsk.ru/ckfinder/userfiles/files/93693036192.pdfIn PDF document text
    • http://gma.ge/admin/ckeditor/ckfinder/userfiles/files/34653940866.pdfIn PDF document text
    • http://connectcontrol.net/files/userfiles/files/8363153379.pdfIn PDF document text
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/f501b400219205f6f184bba39cf4ab6f/xeragufexofotadadosa.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_off0000b54f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB54F 17872 bytes
SHA-256: 3a325a371cab8d450c32e2bf90adec425fba19bdc5b8d86b7dc062a8839ff368
font_01_sfnt_off0000e280.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE280 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fa97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA97 10960 bytes
SHA-256: 316d16cc9d93806002590e3aa2430ca43a5c77cefb7b78de2bb3de2309c117f0

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