Malicious PDF — malware analysis report

Static analysis result for SHA-256 93f3c90c610c8ff6…

MALICIOUS

PDF

87.5 KB Created: 2020-12-31 00:13:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 6fb3ff1f98bf60d086c7e8a7e3d1c140 SHA-1: ae1b62a03be4783d703c8d8185d74d085050d0f8 SHA-256: 93f3c90c610c8ff634cc36f6c28e07fc2e02908ca86f41fa9b58f0ed60c1459d
244 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links pointing to various disposable hosting services and a redirector, indicating a link farm designed to lead users to malicious content. The presence of a link to a known malicious redirector and the ML classifier's high confidence score further support this assessment. No scripts were extracted, but the PDF structure itself facilitates the malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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.
  • 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://cctraff.ru/wb?keyword=ball%20shooter%20gun%20toy In PDF document text
    • https://cdn.sqhk.co/nosuterib/hbijDib/wudese.pdfIn PDF document text
    • https://barijenevedi.weebly.com/uploads/1/3/1/4/131438420/dikogebatuvoviwamuvi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478952/normal_5fb2cd6b51be3.pdfIn PDF document text
    • https://zesawomu.weebly.com/uploads/1/3/4/3/134321331/lubulonutotig.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4480898/normal_5fcd2635a6327.pdfIn PDF document text
    • https://laduvozonos.weebly.com/uploads/1/3/1/4/131408864/ddde436d07bbaa.pdfIn PDF document text
    • https://cdn.sqhk.co/simunenij/Td9X247/designer_city_building_game.pdfIn PDF document text
    • https://jokatilowiwege.weebly.com/uploads/1/3/4/3/134369617/635de1dfc8697c.pdfIn PDF document text
    • https://cdn.sqhk.co/tegatiwuwax/ingc5gg/roku_remote_controlling_two_tvs.pdfIn PDF document text
    • https://filogeruziwumu.weebly.com/uploads/1/3/1/4/131406947/jaxusejabuv.pdfIn PDF document text
    • https://cdn.sqhk.co/rajexizeba/bjdjhfL/33941813772.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/59e0c4a0-9116-4a73-b8ff-0adb6ae644f9/35487808247.pdfIn PDF document text
    • https://s3.amazonaws.com/wizidimawag/59234856554.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/64686b70-9344-406c-bd4b-2acebd0478f1/pokunasurupesez.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
    • 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_off000104cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104CD 5096 bytes
SHA-256: 11ed9d5a4eaef0995b0f955a75874049dfe3824f0c72cdf9f7398e95a60ff935
font_01_sfnt_off00011624.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11624 10568 bytes
SHA-256: 94b5b3d9d5fb0ae9c1701fe31f910e429b6b4d39872cd8de263db3883a99bc56
font_02_sfnt_off00013a70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A70 16164 bytes
SHA-256: 0d7a92828fb34c46272def7401d297891c72c028a4bdfa4d2814ce18bde6b281

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