Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ddf1c8bb42ef109…

MALICIOUS

PDF

76.0 KB Created: 2021-04-02 01:14:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e0ea0650d06d5d9f9af5187c72f673e0 SHA-1: 25e0b1d8f7869f1191a35e0f9ced790ea1efef25 SHA-256: 5ddf1c8bb42ef1095fa65844baf0c784051189453f39f4da9e31f85189d59930
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious File

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of a large number of external links, including one pointing to a potential payload disguised as an audio driver, suggests a phishing or malware distribution scheme. The heuristic 'PDF_SEO_LINK_FARM' indicates a tactic to obscure malicious links within a large number of seemingly legitimate ones.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://vilenefex.ru/strik?utm_term=audio+driver+windows+10+64+bit+dell
    • https://xugojegisonixen.weebly.com/uploads/1/3/4/6/134684264/6047477.pdf
    • https://kutebebi.weebly.com/uploads/1/3/4/5/134528954/futijudubukuge.pdf
    • https://cdn-cms.f-static.net/uploads/4419847/normal_602d0662abc4e.pdf
    • https://cdn-cms.f-static.net/uploads/4380229/normal_5fe6eee00b47d.pdf
    • https://static.s123-cdn-static.com/uploads/4446399/normal_5fe392b3dfc47.pdf
    • https://waxovidimised.weebly.com/uploads/1/3/4/4/134446407/2979ef296db2059.pdf
    • https://static.s123-cdn-static.com/uploads/4476595/normal_6002b43b0459f.pdf
    • https://static.s123-cdn-static.com/uploads/4444864/normal_60069b10e81a5.pdf
    • https://static.s123-cdn-static.com/uploads/4393370/normal_60036019504fb.pdf
    • https://zigajimimokok.weebly.com/uploads/1/3/1/3/131383588/zowenomak.pdf
    • https://madugonado.weebly.com/uploads/1/3/2/8/132815119/nubumagazagovu.pdf
    • https://cdn-cms.f-static.net/uploads/4484605/normal_605f3f4e399db.pdf
    • https://static.s123-cdn-static.com/uploads/4416938/normal_5ffeb7811f464.pdf
    • https://static.s123-cdn-static.com/uploads/4454041/normal_60091a7021b7c.pdf
    • https://static.s123-cdn-static.com/uploads/4389821/normal_6007052797ee9.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/ce18289a-7617-4131-a5c0-83a6704a3d04/46117077217.pdf
    • https://uploads.strikinglycdn.com/files/66bcd20f-cf19-427a-bc29-c4975966e532/adam_smith_la_riqueza_de_las_naciones_resumen.pdf
    • https://s3.amazonaws.com/pasawexawinogad/dosokeviwovikekumed.pdf
    • https://f8ba888e-8f71-4fde-8303-550399648f4e.filesusr.com/ugd/17ce20_ad018a183857404995b9b238b8fa6486.pdf?index=true
    • https://s3.amazonaws.com/tuxexi/huawei_mate_20_lite_aggiornamento_android_10.pdf
    • https://0e67983c-e844-40c9-b604-97311ec94efe.filesusr.com/ugd/6e13d9_14fbbbff918f48d2900c6ff47d8e3a65.pdf?index=true
    • https://uploads.strikinglycdn.com/files/1358c5e4-10b3-48d4-b7e7-7ad4405d4ffc/22760436033.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ecd3.bin
ce09cc2227f180924f9fd406f6e9e710f358552fbccd6030f01bbe7027598399		 pdf-font-stream PDF embedded font (sfnt) at offset 0xECD3 5324 bytes
font_01_sfnt_off0000ff1e.bin
50c9c0ab6adf764630ec488439bc02f90babdbc34f5b47e612594daebbf26342		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFF1E 10448 bytes

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