Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9e5525c55f186e4…

MALICIOUS

PDF

71.7 KB Created: 2021-09-28 10:19:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c1945eaf4926d8c9d1ed1bd14a1a993c SHA-1: 96363e270b4e6fb977c4243de7629e0edefa20aa SHA-256: b9e5525c55f186e44c00d8290235c4e4eb94b17375fab4e02105a9921f144ca3
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external URIs, many pointing to disposable hosting, and is identified as a link farm. The presence of embedded URLs and the nature of the heuristics suggest an attempt to redirect users to malicious sites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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=organic+chemistry+paula+yurkanis+bruice+free PDF link annotation
    • https://mcsfood.com/images/file/bogagewejinunovos.pdfIn PDF document text
    • https://doxity.ro/ckfinder/userfiles/files/46259722636.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/16142b3d7cfe77---bakuvixomepekoforepo.pdfIn PDF document text
    • http://skonasystems.com/userfiles/file/69174609387.pdfIn PDF document text
    • https://fratellifurloni.it/file/37474356971.pdfIn PDF document text
    • http://air-con.ru/upload/files/48573939262.pdfIn PDF document text
    • http://bkm-market.net/userfiles/file/98496906687.pdfIn PDF document text
    • https://detector-billetes.com/Imagenes/file/bomegomopo.pdfIn PDF document text
    • http://wsystem.sk/userfiles/files/12601057568.pdfIn PDF document text
    • http://ooexperience.be/assets/Image/files/nexiluresugevate.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/161367159815cc---bajujizo.pdfIn PDF document text
    • http://ganteltechnology.com/system/userfiles/file/zoforanififobanajis.pdfIn PDF document text
    • http://whatcanidoforyou.eu/publish/file/68315819404.pdfIn PDF document text
    • https://rentcar888.com/uploads/files/202109241501364533.pdfIn PDF document text
    • https://matrainagycsalados.hu/userfiles/file/5416061117.pdfIn PDF document text
    • http://nppgursaraijhansi.in/ckfinder/userfiles/files/mogadoropebofaf.pdfIn PDF document text
    • http://www.vako.vn/app/webroot/uploads/files/rutezuja.pdfIn PDF document text
    • https://ahreco.com/uploads/news_file/51659409732.pdfIn PDF document text
    • http://nuraski.pl/wsg/userfiles/92115232142.pdfIn PDF document text
    • https://latrinquette.com/upload/editor/file/52807360484.pdfIn PDF document text
    • http://volkshilfe-vlbg.at/images/content/files/552828591.pdfIn PDF document text
    • https://familienbilstrup.dk/userfiles/file/jumexida.pdfIn PDF document text
    • http://waterlootour.com/FileData/ckfinder/files/20210906_C6734D960EF32B3D.pdfIn PDF document text
    • https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/de498b3889567ad814b09e830f7f946b/52935966172.pdfIn PDF document text
    • http://canavesiobruno-architetti.it/userfiles/files/mogivedotagilikozo.pdfIn PDF document text
    • http://mopi.eu/ckfinder/userfiles/files/73778412214.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_off0000b2b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2B1 11276 bytes
SHA-256: e2c67523202f3a1872ad1467ca033b6fb88b717d78362d46a5cf484461a2d095
font_01_sfnt_off0000ccde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCDE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e4f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4F0 16580 bytes
SHA-256: 50f1bba183f1b1a9e7a597ff4f4c12975eb260643f29fdcd68374b1cbe7ee0fe