Malicious PDF — malware analysis report

Static analysis result for SHA-256 641037352003ec1d…

MALICIOUS

PDF

80.0 KB Created: 2021-03-05 08:16:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: bd72f2077b772800a3fc49c20cb40e39 SHA-1: 1db8e54231a7ea7d90a311308df1faa67e190e71 SHA-256: 641037352003ec1d8ddd71461ecae5c078d5cc457c5bf3250938f97709a55761
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a significant number of external links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to various domains. One of these URLs, 'https://fokemale.ru/wix?keyword=first+alert+carbon+monoxide+manual+co600a', appears to be a primary lure. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or distributing further malicious content via the link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://fokemale.ru/wix?keyword=first+alert+carbon+monoxide+manual+co600a PDF link annotation
    • http://ronifibofizet.medianewsonline.com/42654736679.pdfIn PDF document text
    • https://benipotuwazel.weebly.com/uploads/1/3/4/4/134445242/ec59e.pdfIn PDF document text
    • http://pojegan.22web.org/94643628497.pdfIn PDF document text
    • http://jojidasusesot.sportsontheweb.net/xusivozanogibar.pdfIn PDF document text
    • https://sezulozag.weebly.com/uploads/1/3/0/9/130969806/letaxejepebi-vetupadulak.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://91c7bc9f-df77-4dbd-ae51-8bcf521f3e61.filesusr.com/ugd/1df9ea_9b50dbcb2d754e329fdc31a6201c9474.pdf?index=trueIn PDF document text
    • http://kedisijusa.onlinewebshop.net/vifomo.pdfIn PDF document text
    • https://s3.amazonaws.com/zubuwujoxom/89370679466.pdfIn PDF document text
    • http://jugexuwaluxanem.rf.gd/satellite_altimetry.pdfIn PDF document text
    • https://s3.amazonaws.com/kubafezin/waco_texas_crime_report.pdfIn PDF document text
    • https://s3.amazonaws.com/wozoxub/camp_hill_school_uniform_shop.pdfIn PDF document text
    • https://s3.amazonaws.com/tosego/naepp_asthma_guidelines_2019.pdfIn PDF document text
    • http://kepofif.onlinewebshop.net/are_lock_picking_tools_legal_in_california.pdfIn PDF document text
    • http://nejarisiwudu.atwebpages.com/is_intermediate_micro_or_macro_harder.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6a01d001-1946-4f9b-a548-0d211663036d/79609171911.pdfIn PDF document text
    • http://jegozejixal.epizy.com/denonubetomapotozi.pdfIn PDF document text
    • https://s3.amazonaws.com/semuxemakaw/38304361104.pdfIn PDF document text
    • https://1a2149e7-ca7f-4e7c-a584-0e483de6f3af.filesusr.com/ugd/9219f8_4c8124ec24494992b65e2674b786cf04.pdf?index=trueIn PDF document text
    • https://c0128b47-9b8e-480e-8e39-154c9fc9162c.filesusr.com/ugd/b81754_a0f7df7ab96f4e1b9f0df3404ee943e7.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/dd1c3867-1277-4d8d-b5b6-6a360695ceb4/73936155079.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/507eedef-1a51-411f-b9f3-4f7252a5f3d6/my_cloud_ex2_ultra_root_password.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f91c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF91C 5544 bytes
SHA-256: 6b14f4535faab55ad0904704c38c9ff6723aa2236a8f3c9359ef3023108df752
font_01_sfnt_off00010bdf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BDF 11316 bytes
SHA-256: 13fa831064750633b9bf37f211496ba0e6354f0da57904f26a1444d9d37af93f

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