Malicious PDF — malware analysis report

Static analysis result for SHA-256 701155f46fc1bfe7…

MALICIOUS

PDF

81.8 KB Created: 2021-03-24 12:12:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6329fa3e8c4dfbc8410a5d77642cda43 SHA-1: 10d8d59c7957c9d7148d47bc421b37c051ca73cd SHA-256: 701155f46fc1bfe748b1c799e2f74be00f85c1c89581cb3b74b6f0c2176cd10f
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 pointing to other PDFs, suggesting a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. While no scripts were directly extracted, the PDF structure and embedded URIs are 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://golowaki.ru/strik?utm_term=transitions+for+second+body+paragraph
    • https://cdn-cms.f-static.net/uploads/4387718/normal_602f0b2c3c23b.pdf
    • https://dedotomonifagax.weebly.com/uploads/1/3/1/6/131606429/5712010.pdf
    • https://cdn-cms.f-static.net/uploads/4471475/normal_60225459b97b1.pdf
    • https://jixatazibasuv.weebly.com/uploads/1/3/4/4/134402985/e1bf0dba4512ee.pdf
    • https://static.s123-cdn-static.com/uploads/4492272/normal_5fcb098e9af44.pdf
    • https://cdn-cms.f-static.net/uploads/4484815/normal_605455fbbfef5.pdf
    • https://cdn-cms.f-static.net/uploads/4472495/normal_6052a73b12668.pdf
    • https://static.s123-cdn-static.com/uploads/4450415/normal_5ff667d0015cb.pdf
    • http://nuwetiveguvo.mypressonline.com/nelarodi.pdf
    • http://gebikomuxe.getenjoyment.net/73905778720.pdf
    • https://xafasujogi.weebly.com/uploads/1/3/4/3/134374351/nifumidinurujel.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://9de673a2-3b8e-40eb-bbf5-c0ad8e71a3da.filesusr.com/ugd/bd5c68_9a5b910e10e94726ac0b21433beb3d8b.pdf?index=true
    • https://6fc76513-a17a-4053-940d-bef108f5ea85.filesusr.com/ugd/3a5ef0_8c3c6ebb2ed64316a33085738c35b252.pdf?index=true
    • https://f3dcd8e3-6656-4b47-a81e-a993d3c4f2a1.filesusr.com/ugd/aa9ef2_4dd7518f31234ecea7104ab386529716.pdf?index=true
    • https://s3.amazonaws.com/fodose/51266035028.pdf
    • https://ca39a19f-16f9-469f-ab0b-65ec0463b8d0.filesusr.com/ugd/cc9b97_4c17d8d2fe61463eaf6c26b460ec2cdd.pdf?index=true
    • http://revudipepofaten.myartsonline.com/can_a_paper_shredder_overheat.pdf
    • https://s3.amazonaws.com/gopuze/veterans_administration_citrix_access_gateway.pdf
    • http://xawiwevivuzox.onlinewebshop.net/diriweju.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f488.bin
f2841e5d8347a13120cd87a54ed84e9afdbf41f96e159bff8110197b892ca39a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF488 5364 bytes
font_01_sfnt_off000106b1.bin
5121e1087edace54cef3adc6529d03c80c0a7786f9fb5fd72bf312a4fadfb51a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x106B1 10804 bytes
font_02_sfnt_off00012b71.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12B71 4324 bytes

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