Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb59456620b56f6d…

MALICIOUS

PDF

69.0 KB Created: 2021-09-09 06:46:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f8aa2fb8913eea9e7b3521a78e77fb26 SHA-1: 08d2db5deb9719d4f6d2f2a8333427b919b6a2c6 SHA-256: bb59456620b56f6df8c2b524564c07e9fafcf9b2fa53d7ce74975a98cd09c0e8
126 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The presence of numerous external links, many pointing to disposable domains and structured as a link farm, suggests a phishing or malware distribution scheme. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall structure points to a malicious campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://www.aragonemprendedor.com/userfiles/files/59927977310.pdf In PDF document text
    • https://ce-mi.pl/uploads/userfiles/files/64046347003.pdfIn PDF document text
    • https://cam-ceeds.org/ckfinder/userfiles/files/pavexunusotijixebasez.pdfIn PDF document text
    • http://orderkiwicafe.com/uploads/files/83646970506.pdfIn PDF document text
    • http://canyonoaksmtg.com/~duckdi5/canyonoaksmtg.com/content/file/bixoxato.pdfIn PDF document text
    • http://4chan.ro/UserFiles/file/sejefegosamipurejoluxa.pdfIn PDF document text
    • http://nuestratierrapremios.com/campannas/file/21315257110.pdfIn PDF document text
    • https://okud-istra.hr/userfiles/file/wudapididonugoziwavasu.pdfIn PDF document text
    • https://esprimagroup.com/userfiles/file/xumazofogatap.pdfIn PDF document text
    • http://www.syrahresources.com.au/application/third_party/ckfinder/userfiles/files/46299941313.pdfIn PDF document text
    • https://rsebolivia.org/userfiles/file/98332552105.pdfIn PDF document text
    • http://artc-polymers.com/upload/images/files/fivadefub.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/161345a9a3c92f---84573988353.pdfIn PDF document text
    • http://sethhukumchandschool.com/userfiles/file/lowekugonob.pdfIn PDF document text
    • https://youxsoft.com/uploads/files/24780573468.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/161371852721c8---37484110449.pdfIn PDF document text
    • https://medpressa.ru/files/file/nepuguwedin.pdfIn PDF document text
    • https://femagnet.com/upload/edu/article/file/33770842153.pdfIn PDF document text
    • https://pasarantogel2.com/contents/files/jovegunufomibo.pdfIn PDF document text
    • http://turnyras.lt/Files/file/51667770216.pdfIn PDF document text
    • http://kimwendelldesign.com/ckfinder/userfiles/files/luledimifugonafezil.pdfIn PDF document text
    • http://www.c-l-r-p.com/admin/ckfinder/userfiles/files/17869196723.pdfIn PDF document text
    • http://blueview.nl/app/webroot/files/userfiles/files/vizusi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=live+net+app+downloadPDF 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_off0000b185.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB185 15316 bytes
SHA-256: adf12cd4508f5c2647d09e3ec3f6fc1a3b4baf41a810fd1f589355b68a69dd2d
font_01_sfnt_off0000d703.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD703 10228 bytes
SHA-256: 83035126995ebc7c21454539bb00890347cc9f33593dbd069a6c802155206d4d
font_02_sfnt_off0000ee16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE16 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1