Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3db6a09af44a612…

MALICIOUS

PDF

68.3 KB Created: 2020-11-21 15:49:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 3042237f1eb59247b93d3d49342a44ed SHA-1: 1b14a0b10f28a205ecad02df3226a3913ac3b465 SHA-256: a3db6a09af44a612d6e11f983d0204329d58f7a50a3603ba3b227714a9dc62b2
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with a critical heuristic identifying it as a link farm. The ClamAV detection and ML classifier strongly indicate maliciousness, specifically as a phishing or trojan delivery mechanism. While no scripts were directly extracted, the PDF structure and embedded links suggest an intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://trafffe.ru/123?utm_term=how+to+embed+fonts+in+pdf+acrobat PDF link annotation
    • https://remewizefo.weebly.com/uploads/1/3/1/8/131856163/ab3a255eda76954.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445739/normal_5fb70a19d5169.pdfIn PDF document text
    • https://pafasuletelaw.weebly.com/uploads/1/3/4/4/134447528/nunadobagi.pdfIn PDF document text
    • https://fupesovuzej.weebly.com/uploads/1/3/4/0/134016868/leguwokenesom.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480389/normal_5fadaa4bdaf50.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447270/normal_5fb8a2597dee3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371258/normal_5fa33c6cebc91.pdfIn PDF document text
    • https://goraworozegisu.weebly.com/uploads/1/3/4/3/134324811/2530338.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/c60c7d0d-98e8-4f61-bf25-d4f2519b95db/fulepafemi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/97b79f2a-93e4-41ef-93cb-33a448d420f6/deep_sea_electronics_7320.006.01.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/603c2c0e-566e-4f45-b1ad-8bdf0c04662e/27616140792.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bddb6130-a45f-4c9e-b6c3-13793518c070/birds_attacking_car_mirrors.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a50deca5-67c2-46f5-a111-dab64d9bdef1/chemical_sedimentary_rocks_examples.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/be0520cc-f0b6-4587-9933-78d84940bf6a/kegagezoguridadoruga.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/46ea8294-0e43-4553-92c0-3746ca5724fa/gajenidirone.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cbbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBBB 5464 bytes
SHA-256: 1dae2dbd9c58f73545bd601005c250c109c74a1cdfec6c031578fcc765dd3d01
font_01_sfnt_off0000de42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE42 11816 bytes
SHA-256: e77aad95af1dca6b548c99443b5b4f7a39db574f7b677450cd7292646741e449

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