Malicious PDF — malware analysis report

Static analysis result for SHA-256 4291e7257108089f…

MALICIOUS

PDF

90.1 KB Created: 2021-05-27 00:50:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: f35504f7aaf480a6aad70a61609aef82 SHA-1: e5df540655272ab95df7bc686d55272d52ee5544 SHA-256: 4291e7257108089f655ec9e15009e446572726c33b6bcd944de85aa762f97de1
156 Risk Score

Malware Insights

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

The PDF contains a heuristic indicating a link farm and an embedded URI pointing to a suspicious domain, suggesting a phishing or malware distribution attempt. The ClamAV detection and ML classifier further support its malicious nature. Although no scripts were directly extracted, the PDF structure and embedded links are indicative of a malicious lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://ponafet.ru/strik?utm_term=why+won%2527t+my+fire+stick+remote+control+work PDF link annotation
    • https://pebusopewege.weebly.com/uploads/1/3/4/7/134752512/03a2cc55fe3527f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376612/normal_5fd88b3cc6f5d.pdfIn PDF document text
    • https://bosuzegenelulu.weebly.com/uploads/1/3/4/1/134131522/b881322689.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461201/normal_600af9bc6f07c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369507/normal_5fe17d662dbff.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448558/normal_601b43101c4b6.pdfIn PDF document text
    • https://nevijajemiwawo.weebly.com/uploads/1/3/4/3/134340376/refubud.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423452/normal_600b8e5d255c2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383147/normal_6068b3c120eee.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393183/normal_602788bc291c9.pdfIn PDF document text
    • https://kukonugaxa.weebly.com/uploads/1/3/5/3/135327287/wobosopibenufiverid.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369656/normal_5ffa4ef54c9bc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368770/normal_5ffc2ce33edfe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419235/normal_601b3af7b10a8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376375/normal_602952bdd89d8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4505358/normal_605667ae38fa4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481831/normal_60295df073edc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409107/normal_605af5fa4cc41.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/89dfc17b-3833-47de-937b-09428507e307/37720328554.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dd62e5b2-3049-46b5-bd33-411f2a96ec10/red_dead_redemption_2_walkthrough.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8c5a3d5b-d706-4ee1-9686-fd8f054a5e0d/resumen_completo_del_amor_en_tiempos_de_colera.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9a4052ee-66e5-4b10-adf2-20ca16aa8eae/87929887322.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2b0a0c03-1fe9-48c2-9a3d-3341d83d9382/xikalazixerununel.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_off000109ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109EC 5216 bytes
SHA-256: 3f8b61d1213ad4aa5044b1db1dde766bc6fbaf654817dc28af3ba95cbf7697d9
font_01_sfnt_off00011bab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BAB 11888 bytes
SHA-256: fd398d6c4bb7cb0d537aff9a44d1f5c1bd7236c7aca4a427f532291760c6ebc3
font_02_sfnt_off00014439.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14439 16704 bytes
SHA-256: 80e6db5095f5ad6b9fcee4a2b1d01ca4d7789885a01badedbfd0dbc0cd442411

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