Malicious PDF — malware analysis report

Static analysis result for SHA-256 855a684ce77cdeed…

MALICIOUS

PDF

84.1 KB Created: 2021-02-28 20:01:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-06-05
MD5: daaa52e8a2c0d5c0d72db676085f3bca SHA-1: c721b2213df415d7b149bcb41b904d742cf789e3 SHA-256: 855a684ce77cdeeddbbbccf4ca516b7e983d5040a18c4f4417ea4936bf88fdcf
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, with critical heuristics indicating it functions as a PDF link farm. It contains numerous external URIs, including 'https://seumenha.ru/wix?keyword=python+pseudocode+while+loop', which likely serve as lures. The PDF structure and embedded links suggest an attempt to redirect users to potentially harmful content or phishing sites.

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://seumenha.ru/wix?keyword=python+pseudocode+while+loop PDF link annotation
    • http://ladidoxa.iblogger.org/adobe_illustrator_newspaper_template_free.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489981/normal_5fdc4415d3e47.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374022/normal_601d218548d14.pdfIn PDF document text
    • https://vutakajar.weebly.com/uploads/1/3/4/8/134896426/a7b3c24f1c2.pdfIn PDF document text
    • http://dumubemajizukov.medianewsonline.com/27364358529.pdfIn PDF document text
    • http://zunuruxeguxifi.mygamesonline.org/how_to_reset_danby_wine_cooler.pdfIn PDF document text
    • https://befewegumezozem.weebly.com/uploads/1/3/1/4/131453636/larafekisev-nisuzut.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464709/normal_602a3526a9da4.pdfIn PDF document text
    • https://zaxizibu.weebly.com/uploads/1/3/4/6/134672664/fuzepuluwijer_kowedidezebu_zoniguvisulu_xuzefowofari.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369322/normal_6010f8634e2d4.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gixarewujedel.atwebpages.com/descargar_curso_de_ingles_rapido_y_facil_gratis.pdfIn PDF document text
    • https://s3.amazonaws.com/tamobalasu/98559463324.pdfIn PDF document text
    • https://s3.amazonaws.com/defujo/princesas_para_colorear_e_imprimir.pdfIn PDF document text
    • http://pelebirepopo.onlinewebshop.net/sesabeboruv.pdfIn PDF document text
    • http://pibozaxasoloje.rf.gd/limejomusinapuge.pdfIn PDF document text
    • https://s3.amazonaws.com/memexelu/54846510696.pdfIn PDF document text
    • https://s3.amazonaws.com/diwitapezu/patamitobezagebedam.pdfIn PDF document text
    • https://s3.amazonaws.com/lopeteb/54765546726.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_off00010ee1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EE1 5052 bytes
SHA-256: 13f0016bea57442623fedd614c62295732ee5d9eb8d6112022efa086c4295f34
font_01_sfnt_off0001202b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1202B 10420 bytes
SHA-256: bdb1323e115ff020243e8ac4156f3305e9ae102940127326bed8910635aa8b86

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