Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ec2056b0a00c966…

MALICIOUS

PDF

78.4 KB Created: 2021-03-11 02:42:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e1ee97c321dbbe6eb4ed9ec7f19e3d7f SHA-1: 684c06c22d0f920dc4b3a52432787654abd3de86 SHA-256: 9ec2056b0a00c9660acec0e9e914fac51077f09892062dd427fa4f257198e8d1
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 documents with SEO-like titles, indicating a link farm or SEO spam campaign. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution via these links. No scripts were extracted, but the PDF structure itself is indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://druttle.ru/123?utm_term=long+span+aluminium+roofing+sheet
    • https://novatoful.weebly.com/uploads/1/3/0/9/130969934/38d6cdd54.pdf
    • https://cdn-cms.f-static.net/uploads/4391331/normal_602f9d102657f.pdf
    • https://cdn-cms.f-static.net/uploads/4476123/normal_603bc660e05f9.pdf
    • http://espaceabonnes.com/the_other_side_of_paradise_glass_animals_ukulele_chordsjycc2.pdf
    • https://static.s123-cdn-static.com/uploads/4392452/normal_5fe2f20e01254.pdf
    • https://cdn-cms.f-static.net/uploads/4414166/normal_603bde5384bc0.pdf
    • http://erogan-oficial.site/mapovozeto1wtxl.pdf
    • http://dkmz2.club/643216155818rmet.pdf
    • https://riwozetamozu.weebly.com/uploads/1/3/4/3/134331456/5123554.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/4e70f85a-a560-4038-860d-23e6a4bed306/what_fruit_juice_is_good_for_high_blood_pressure.pdf
    • https://uploads.strikinglycdn.com/files/859acf89-0316-4b75-8564-a1a22d126fd0/jumolapigubebo.pdf
    • https://49b7c339-fea6-4bb3-bf7b-ca47af5263df.filesusr.com/ugd/6ca12d_4916ce986efe47509fe6c212b6cefa02.pdf?index=true
    • https://uploads.strikinglycdn.com/files/023211f8-afe5-4538-989c-3f48ca501e3e/conversion_de_pulgadas_a_milimetros.pdf
    • https://uploads.strikinglycdn.com/files/8ee7880b-bd39-42be-a170-80ad4f05edc1/is_nitecore_a_good_flashlight.pdf
    • https://uploads.strikinglycdn.com/files/9966fb35-b5f0-49bf-8029-2c0e46b28d45/lilexumepomubiro.pdf
    • https://uploads.strikinglycdn.com/files/d20040df-1019-4278-88d8-c0a8a61da5f1/sozuwetimuxe.pdf
    • https://uploads.strikinglycdn.com/files/71993152-e0d5-4c0e-b982-09b76ba75cce/27023537367.pdf
    • https://c0771fee-1ba5-4dbf-bba5-a775c3d44c03.filesusr.com/ugd/544e7e_1fa2bd74bb01495b8255ba6168bf41a5.pdf?index=true
    • https://uploads.strikinglycdn.com/files/3313f4ee-dd13-4184-bd2d-c65b3466f871/80502141041.pdf
    • https://5fb42ee6-a9be-400a-98f2-f9d4b9f720c8.filesusr.com/ugd/1813b3_1d0896eb1310483198a5bd0a59477f4e.pdf?index=true
    • 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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f4d7.bin
7238ceceed0dd3ac4a4654c7d744b5c03f359a6f33819fb0fdc5f03a58f18670		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF4D7 5256 bytes
font_01_sfnt_off00010699.bin
cd134c203068e44a9693a04f9c1d0ba1991b951a1588287baa4e0b95e1d66a9b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10699 10976 bytes

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