Malicious PDF — malware analysis report

Static analysis result for SHA-256 2cd321fca72b3494…

MALICIOUS

PDF

67.1 KB Created: 2020-12-19 06:12:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: f405f394dcfbce31b4ce7e3f5ba32189 SHA-1: 95ec93f49467631384c04cd797ca9a3a56b56ce4 SHA-256: 2cd321fca72b34948561ac834f3830b402d7d6547575606dbf01d281df460a27
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF document contains a large number of embedded external links, many of which point to potentially malicious domains, suggesting a link farm or phishing lure. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the PDF structure itself is used to host and distribute malicious links.

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://trafftec.ru/strik?utm_term=gattaca+viewing+questions+answer+key PDF link annotation
    • https://nipobajomofak.weebly.com/uploads/1/3/4/6/134641158/8045720.pdfIn PDF document text
    • https://lerojapozexux.weebly.com/uploads/1/3/4/0/134016693/bufavosodijanen_wumibakejubi_daperu_gatarenaf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368758/normal_5f92af4d57913.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/bc9b4a55-8567-4e2c-8bf4-8b3878ab7f08/kubunogiridadumubiwojon.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/759261da-4f16-4bc3-929b-0112c9d9bdfd/10.3_regulating_the_cell_cycle_worksheet_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/18fcea3d-3925-46ab-9932-dedcc099cdec/tempe_center_for_the_arts_antibody_testing.pdfIn PDF document text
    • https://s3.amazonaws.com/juliziwojatige/63867798611.pdfIn PDF document text
    • https://s3.amazonaws.com/wujapu/better_english_pronunciation_audio.pdfIn PDF document text
    • https://s3.amazonaws.com/wuwabobujasivor/real_estate_germany_report.pdfIn PDF document text
    • https://s3.amazonaws.com/midaguvimabof/zesupufukegawimebeteluger.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4d4de516-fb84-4a77-abbc-85791fc57c87/61716748901.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aca7ddad-cabe-425e-807a-cdb06ea1ed1b/8086_instruction_set_reference.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_off0000c96e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC96E 5412 bytes
SHA-256: f8c693b69032c5931b3cd5d90157848a32f7bec13370845b043ddb928abd165a
font_01_sfnt_off0000dc08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC08 10504 bytes
SHA-256: 3ff9a43d031765eab0116f02e960606ffae83ae0d5cfc336a4c0f4cb0d4df670

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