Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff237b6a840583da…

MALICIOUS

PDF

135.0 KB Created: 2021-03-30 13:42:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a0a34518bb9f8fa87a749d84c5f3d443 SHA-1: dd8dbfaa92da070f3deed0abdbfed8032399acfc SHA-256: ff237b6a840583da9f6ac9f20ea4fd87c105aa649c4c58c067e249d9af081e20
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are to suspicious domains, suggesting a link farm or phishing attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://ponafet.ru/strik?utm_term=champion+dual+fuel+generator+9000+parts
    • http://najisemure.medianewsonline.com/binomial_pairs.pdf
    • http://jifarobajis.sportsontheweb.net/69730745144.pdf
    • https://cdn-cms.f-static.net/uploads/4417536/normal_602253746ac82.pdf
    • http://fopokigife.mywebcommunity.org/15263887143.pdf
    • https://cdn-cms.f-static.net/uploads/4458413/normal_603aac63812c0.pdf
    • https://cdn-cms.f-static.net/uploads/4417999/normal_604cf6c7d7f3b.pdf
    • http://vexasefagi.scienceontheweb.net/marketing_project_file_download.pdf
    • https://cdn-cms.f-static.net/uploads/4451369/normal_5fd864f190778.pdf
    • https://static.s123-cdn-static.com/uploads/4428329/normal_5fe37371454cf.pdf
    • https://cdn-cms.f-static.net/uploads/4470683/normal_60567e8c5ebcb.pdf
    • https://vadukoku.weebly.com/uploads/1/3/4/7/134707593/7979252.pdf
    • https://cdn-cms.f-static.net/uploads/4405430/normal_605a605cc97c4.pdf
    • https://cdn-cms.f-static.net/uploads/4489041/normal_600ecc7313825.pdf
    • https://cdn-cms.f-static.net/uploads/4384028/normal_6038c390e30a3.pdf
    • https://cdn-cms.f-static.net/uploads/4418781/normal_6014afc02b195.pdf
    • https://luzafoku.weebly.com/uploads/1/3/0/8/130814295/7fa2b.pdf
    • https://cdn-cms.f-static.net/uploads/4529024/normal_603649cfd328f.pdf
    • https://cdn-cms.f-static.net/uploads/4427526/normal_60393b7ed9781.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/d46d50ba-7847-4275-af5e-712dbd1a2b48/96147712279.pdf
    • https://uploads.strikinglycdn.com/files/9fb764a8-129e-4411-8841-d52db73e68a6/moon_phases_lesson_plan_4th_grade.pdf
    • https://uploads.strikinglycdn.com/files/dcab16cb-b454-41c6-816d-478e580b17b3/23966903440.pdf
    • http://vexolofifete.atwebpages.com/47787792.pdf
    • https://uploads.strikinglycdn.com/files/e6ffe648-eef1-4039-ac83-e5bf5f1a2d9f/icom_ic_746_pro_mods.pdf
    • https://uploads.strikinglycdn.com/files/cfa99275-bc43-48fa-be54-945e935170b8/1488446252.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License
    • https://savannah.gnu.org/projects/freefont/
    • http://www.gnu.org/licenses/
    • http://www.gnu.org/copyleft/gpl.html

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00019a70.bin
f296b3e45d07b46150f3d19dbfcdc151d6983c0fc0f68a8eef6a212fbdbca951		 pdf-font-stream PDF embedded font (sfnt) at offset 0x19A70 5656 bytes
font_01_sfnt_off0001ad82.bin
38e86a4844470769b8db25403fe7329e4f134757379bcc3e407d420e001342d4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1AD82 17732 bytes
font_02_sfnt_off0001e776.bin
f3e02129bff4cbbc934b01e18f431f77722967162bacd7e1c6c07dada7d1acfe		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1E776 16512 bytes
font_03_sfnt_off0001fded.bin
16a5dd7f8a88ccfbf179313e51369f81f7d41db5f0614ded099675b2dab90259		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1FDED 6164 bytes

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