Malicious PDF — malware analysis report

Static analysis result for SHA-256 e51027bdd0104cbd…

MALICIOUS

PDF

77.7 KB Created: 2021-02-27 04:10:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 1aaa782acbf03d9b84f2ae9c55d10443 SHA-1: 26e08590cb74f37b8154a87323bc2c5b703cc79b SHA-256: e51027bdd0104cbdaca9ab18a03b45ef4f1c39fd8fdde882141b4270bab04027
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to direct users to malicious content. The presence of a Siemens hearing aid service center lure in the document body, combined with the PDF_SEO_LINK_FARM heuristic, indicates a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly support the malicious verdict.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://midufefew.ru/123?utm_term=siemens+hearing+aid+service+center PDF link annotation
    • https://moniraje.weebly.com/uploads/1/3/1/4/131438162/bujaxudisikexu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388613/normal_5fe50cb9428f3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427293/normal_5fd7b5cc3a865.pdfIn PDF document text
    • https://kexujutexaz.weebly.com/uploads/1/3/1/8/131858540/678ec61f4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412173/normal_601330179ac5a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485699/normal_5fd5f9a83be6f.pdfIn PDF document text
    • http://tosufiloxosi.66ghz.com/libro_de_fisica_3_bachillerato_2020.pdfIn PDF document text
    • https://xuwobonamufaguw.weebly.com/uploads/1/3/5/3/135315698/356190.pdfIn PDF document text
    • https://gonibulurigudum.weebly.com/uploads/1/3/0/8/130874364/3851392.pdfIn PDF document text
    • https://sakurulemiba.weebly.com/uploads/1/3/0/9/130969926/texawolexepepetu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370063/normal_5ffcc201a5c35.pdfIn PDF document text
    • http://dovulup.iblogger.org/ballot_paper_template_ks2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427526/normal_60111b9d38b0e.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
    • http://xewenofos.epizy.com/42543264924.pdfIn PDF document text
    • http://vimixof.onlinewebshop.net/gotasa.pdfIn PDF document text
    • http://letutemoxeluz.onlinewebshop.net/lean_six_sigma_white_belt_exam_questions_and_answers.pdfIn PDF document text
    • http://peledopa.myartsonline.com/how_to_use_a_presto_weighted_pressure_canner_canner.pdfIn PDF document text
    • http://xaviwawav.epizy.com/dodilufuvazek.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_off0000e5f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5F0 5164 bytes
SHA-256: 172b147d0307ded6eb13b600c3d8d343a358f2d48dc0a9a209b3f8f2a140fd6e
font_01_sfnt_off0000f740.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF740 10660 bytes
SHA-256: 47b1eb75df57e849f71c4a9b1a9b4422e1a4a62b3a89893db80b75eaa2d49b42
font_02_sfnt_off00011ba8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BA8 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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