Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e33b78f594f0fa0…

MALICIOUS

PDF

57.6 KB Created: 2020-11-24 08:43:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 7d62da85cca831ad56b7cd0370afb7fe SHA-1: 9adaf6455dc49e57e9e67bc280214783cd589fe3 SHA-256: 5e33b78f594f0fa0d43a5b3aa7010ad5fa8677b1d0afd27eea9bfd7d9a55492c
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains numerous external links, a common tactic for link farming or distributing malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as a phishing trojan. The presence of embedded URLs and the heuristic 'PDF_SEO_LINK_FARM' suggest the document is designed to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://trafficel.ru/123?utm_term=libro+de+sopa+de+letras PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4412165/normal_5f9559c189c39.pdfIn PDF document text
    • https://sekamaxe.weebly.com/uploads/1/3/4/5/134590712/rabokufisafa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476436/normal_5fa8977e6cb15.pdfIn PDF document text
    • https://wifajeru.weebly.com/uploads/1/3/4/3/134342489/2119137.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490524/normal_5fbbc8126794f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/wusigipufuvowix/pivafupoporibatugobaga.pdfIn PDF document text
    • https://s3.amazonaws.com/jevelel/variedades_de_milho_produzidas_em_mocambique.pdfIn PDF document text
    • https://s3.amazonaws.com/jidosatikim/porobujopekunuzezug.pdfIn PDF document text
    • https://s3.amazonaws.com/gajakelegeza/baahubali_the_beginning_sivuni_aana_song.pdfIn PDF document text
    • https://s3.amazonaws.com/tetazino/jabonewivin.pdfIn PDF document text
    • https://s3.amazonaws.com/jasadavebaga/66062323960.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_off0000a39d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA39D 5032 bytes
SHA-256: 27e1316d03efc9df7a15274c939ff5253e604f853c0436200411308e6e8b6e26
font_01_sfnt_off0000b4ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4BA 1800 bytes
SHA-256: e9a5a1f6ed95b1e3669933bb00002ad32a1708c3e0b735191cad5e02368a6c7d
font_02_sfnt_off0000bd47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD47 8220 bytes
SHA-256: b7e87f5dbfac0f92b422986724f4977ad06e9aacf460cd72a9598243b4ba82af

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