Malicious PDF — malware analysis report

Static analysis result for SHA-256 7272dfd9b3ba3481…

MALICIOUS

PDF

80.1 KB Created: 2021-02-19 05:50:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 1c34d17272e376f43185033a9a9c4cf2 SHA-1: e75a4568cb8fe4ce2e8d4222346b32d224df40a9 SHA-256: 7272dfd9b3ba34817b686c9d2c518d547f36df8511ebe2e9970d50705917e67d
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a link farm, suggesting a malicious intent to redirect users to potentially harmful sites. The ClamAV detection and ML classifier strongly indicate maliciousness, with the document likely serving as a lure for phishing or malware distribution. No scripts were extracted, but the PDF structure itself facilitates the attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://druttle.ru/123?utm_term=mathematics+textbook+for+class+7+chapter+10 PDF link annotation
    • https://guzesunidami.weebly.com/uploads/1/3/0/8/130873942/1680278.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370071/normal_6007b2eb5fdcf.pdfIn PDF document text
    • https://raguwagoneneza.weebly.com/uploads/1/3/1/3/131384547/2127719.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412387/normal_5ff59493706b7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376125/normal_6022572e5d08d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366003/normal_600c0c9a8350a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4382782/normal_5feb32206efdd.pdfIn PDF document text
    • https://wobozosexeje.weebly.com/uploads/1/3/0/8/130814788/8867931.pdfIn PDF document text
    • https://vobudofokivelux.weebly.com/uploads/1/3/4/5/134599261/4145007.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/ligole/todonabunodedoj.pdfIn PDF document text
    • https://s3.amazonaws.com/wupixufekijax/zarajataruviw.pdfIn PDF document text
    • https://s3.amazonaws.com/woberiz/access_database_repair_software_free.pdfIn PDF document text
    • https://s3.amazonaws.com/xipavir/wolavozanajeti.pdfIn PDF document text
    • http://mujotipaxoxi.epizy.com/analogy_worksheet_2_answer_key.pdfIn PDF document text
    • http://gusosowir.rf.gd/35768475997.pdfIn PDF document text
    • https://s3.amazonaws.com/sikuva/85103616598.pdfIn PDF document text
    • http://soriwolawiri.epizy.com/74670428158.pdfIn PDF document text
    • https://s3.amazonaws.com/xabalaru/xiweworixazedaxoriso.pdfIn PDF document text
    • https://s3.amazonaws.com/pisedij/bikaluratulabajotidab.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eba6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBA6 5488 bytes
SHA-256: 6bc1c5ac4365a0779a062b728494fa4609b31440f9c5dbda1c5547ef59c1fb8b
font_01_sfnt_off0000fe5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE5A 11172 bytes
SHA-256: 3c8f167a4e7d2ee46403cc36e204090ec8a5f8e1b23dc0fc7b6d249d9c31903b
font_02_sfnt_off0001248b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1248B 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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