Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d984f78056b687c…

MALICIOUS

PDF

71.3 KB Created: 2021-09-27 14:23:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 366bf3d7692bbc0025b91ce7d022e912 SHA-1: 184bbf0029d7f514166b18faf8737619b90303ba SHA-256: 5d984f78056b687ce2fc74b9d5c048069c85c7d361e8fc6d3b5931f0d8cb9df5
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to numerous distinct PDF files hosted on various domains, many of which are unknown or suspicious. The primary goal appears to be directing users to potentially malicious content hosted on these external domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://tabouligrill.com/ckfinder/userfiles/files/692168701.pdf In PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/1614642fce816f---sifetozonuvi.pdfIn PDF document text
    • http://greddy.com/admin/common/ckfinder/userfiles/File/73028592058.pdfIn PDF document text
    • https://delaneyllc.com/ckfinder/userfiles/files/5109287455.pdfIn PDF document text
    • https://gulfcans.com/home/madarmun/public_html/gulfcans/images/bulk_images/files/kajuwuzenalek.pdfIn PDF document text
    • https://unosms.us/userfiles/file/99241496052.pdfIn PDF document text
    • https://gencatakan.com/upload/file/lojenarilanesewekax.pdfIn PDF document text
    • http://marthomaiticherukole.com/userfiles/file/kijaxotejeretunezirosa.pdfIn PDF document text
    • https://jurad.eu/files/file/4406622115.pdfIn PDF document text
    • http://okeefesreef.com/ckfinder/userfiles/files/wigulusowojelam.pdfIn PDF document text
    • http://www.moyekolodin.com/files/muxorixa.pdfIn PDF document text
    • https://papiratisk.cz/soubory/pojerefu.pdfIn PDF document text
    • http://dblbtech.com/userfiles/file/28688831073.pdfIn PDF document text
    • http://nedvizhimost-v-sharm-el-sheikhe.ru/uploads/files/tedirosezatujugusogap.pdfIn PDF document text
    • http://p-energo.ru/content/file/73628305900.pdfIn PDF document text
    • https://avukatwebsitesi.trakyasoft.com/upload/files/dagususigokelazofij.pdfIn PDF document text
    • http://megalaserasia.com/upload///4060920313.pdfIn PDF document text
    • https://doublehaircenter.com/upload/ckfinder/files/74311530118.pdfIn PDF document text
    • https://studiopros.com/userfiles/file/In PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142a39119115---tizixolomewipak.pdfIn PDF document text
    • http://yanarfabrics.com/firma/files/murevepe.pdfIn PDF document text
    • http://ipcmanpower.com/admin/style/images/userfiles/file/30282680185.pdfIn PDF document text
    • http://limeitec.com/upfiles/editor/files/78339111802.pdfIn PDF document text
    • http://hotel-gerard-dalsace.com/upload/document/numamawirobidodelinelap.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=core+concepts+of+accounting+information+systems+13th+edition+pdf+freePDF 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_off0000b03d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB03D 17084 bytes
SHA-256: 84e4ad70170d318fb0d6f7afef14cc96ebc05157a87d98f5b95774bcec235f3b
font_01_sfnt_off0000dc20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC20 11492 bytes
SHA-256: 0732385f5e98d5c374bba184b2bbf7d1766495065ef4eb6c6113e3885ebc0aad
font_02_sfnt_off0000f712.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF712 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1