Malicious PDF — malware analysis report

Static analysis result for SHA-256 91fe5574adccf00c…

MALICIOUS

PDF

79.8 KB Created: 2021-09-16 01:11:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-27
MD5: 4f72a5980f40e8940f29b18a4a783698 SHA-1: 6bed979ec108384f7f9be61153ecc5cb9f3eff81 SHA-256: 91fe5574adccf00cd3fa8de7dc93442b03d3a15fedae3dda00da566447fadb43
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to link farms hosted on disposable domains, a common tactic for phishing or distributing further malware. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests this malicious intent. While no scripts were explicitly extracted, the nature of the embedded URLs and the ML classification indicate a high likelihood of malicious activity, possibly involving JavaScript execution within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://sgrappresentanze.eu/userfiles/files/67437267504.pdf In PDF document text
    • https://www.naabelectric.com/userfiles/files/kafeboramebosagipivimi.pdfIn PDF document text
    • http://bebsulmare.com/userfiles/files/bowopowawibinurud.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/xajerekokajexor.pdfIn PDF document text
    • http://bowenlawmt.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/kakadipezukuxu.pdfIn PDF document text
    • https://xn--lenachatka-57b.pl/uploaded/file/48831863133.pdfIn PDF document text
    • http://hindel-relax.ch/ckfinder/userfiles/files/zevezodubij.pdfIn PDF document text
    • https://nguoixunghekiev.vn/userfiles/file/95696460717.pdfIn PDF document text
    • http://aucoindeshalles.fr/menu/file/38374429143.pdfIn PDF document text
    • http://maksimetall.ru/files/20770179559.pdfIn PDF document text
    • https://szalkasszorutacskok.hu/app/webroot/files/content/files/36679188252.pdfIn PDF document text
    • http://web5gstore.com/Files/files/ketinideduvazijomofa.pdfIn PDF document text
    • http://obras.ru/sites/default/files/uploads/95575487517.pdfIn PDF document text
    • http://penzionnakrizankach.cz/ckfinder/userfiles/files/wopokapi.pdfIn PDF document text
    • http://unitec-egypt.net/userfiles/file/19937509235.pdfIn PDF document text
    • http://jarosi.hu/files/file/ribup.pdfIn PDF document text
    • http://barrybusiness-crm.com/ressource/devis-photo/files/gutevojuji.pdfIn PDF document text
    • http://studiopol.com/userfiles/files/pizapozadibaxomulezut.pdfIn PDF document text
    • http://vitanova-cattery.com/upload/file/gozuke.pdfIn PDF document text
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613c684c4eea1---70051734472.pdfIn PDF document text
    • https://lazeo.nl/userfiles/file/72160147733.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f517ccbb64---72529058682.pdfIn PDF document text
    • http://ityab.com/cache/fck_files/file/57734526384.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=warlords+of+aternumPDF 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_off0000d5dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5DD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000edef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDEF 16984 bytes
SHA-256: 93d4a7c884c5be7ea9faab3585679a1d09ca95a6c6e496d018f1ff837751338e
font_02_sfnt_off00011a0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A0B 10516 bytes
SHA-256: be99e7c2b304200771d52ece54e2c53f3f84cca24161e12bee1a9e1cb4525fa3