Malicious PDF — malware analysis report

Static analysis result for SHA-256 fde319f05da1479c…

MALICIOUS

PDF

81.4 KB Created: 2021-09-20 00:28:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 692a7fe9ce6f0e719811b1895c22f474 SHA-1: 1380c7cd894396bdfee1dbef5935cfd18b57c44c SHA-256: fde319f05da1479cbb1a914c653696f39d58178ce3ff51352ea91103842edbdb
134 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs and is flagged by ClamAV as a phishing trojan. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of hosting numerous links on disposable domains, suggesting an attempt to distribute malicious content. The ML classifier also strongly indicates maliciousness, supporting the conclusion that this document is designed to trick users into downloading malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=ps3+emulator+android+download PDF link annotation
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/16131a1a859b34---jadevutolip.pdfIn PDF document text
    • https://nordavril.com/userfiles/file/foveletozivuf.pdfIn PDF document text
    • http://solar-makernavi.com/ckfinder/userfiles/files/bizovegububadi.pdfIn PDF document text
    • http://kbidc.kr/upload/editor/file/1631610604.pdfIn PDF document text
    • http://tygodnikzuzlowy.pl/ckfinder/userfiles/files/jibotolufufarevuw.pdfIn PDF document text
    • https://bitree.ru/ckfinder/userfiles/files/32279951396.pdfIn PDF document text
    • https://www.prieur-equipement.com/ckfinder/userfiles/files/62984610981.pdfIn PDF document text
    • http://gyogytornasziget.hu/uploads/files/togovexulibogoredi.pdfIn PDF document text
    • http://www.logistiekverbeteren.nl/ckfinder/userfiles/files/pugaxo.pdfIn PDF document text
    • http://kamnitikamini.si/upload/files/xotalo.pdfIn PDF document text
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614207aa2f7bc---88379683722.pdfIn PDF document text
    • https://taxfirma.com/userfiles/file/46329879885.pdfIn PDF document text
    • https://fceresources.com/ckfinder/userfiles/files/18003919268.pdfIn PDF document text
    • http://neoneofitou.com/ckfinder/userfiles/files/2232105.pdfIn PDF document text
    • https://njshore.drinkpoint.com/uploads/files/mibibikedotanoxusavev.pdfIn PDF document text
    • http://it-hair.com/userfiles/rewopudu.pdfIn PDF document text
    • http://plenaseguroseprevidencia.com/fotosempresa/files/59522275854.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/vukawalirapodakixe.pdfIn PDF document text
    • http://marjoleintje.nl/include/userfiles/mijitekijugi.pdfIn PDF document text
    • http://www.barbazan-debat.fr/ckfinder/userfiles/files/xotamiwimopumebe.pdfIn PDF document text
    • http://gndpta.eu/news_objects/files/sufovazapovoperuzije.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_off0000d8ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8AE 10768 bytes
SHA-256: b12ca3bcb83c6f2fd445adf317e803497bf2238887c983f068e6350cc16dfb14
font_01_sfnt_off0000f186.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF186 18096 bytes
SHA-256: 5548ce207fcafa172acc758c0930c27088d9fe5e3ed4c7c8de2914a44eae2e0c
font_02_sfnt_off00012018.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12018 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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