Malicious PDF — malware analysis report

Static analysis result for SHA-256 2fb83faf4ff13f44…

MALICIOUS

PDF

99.7 KB Created: 2021-03-29 00:25:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: de9c44572e61c4381bae0f70f63464b4 SHA-1: d6894aca66fe7af191b2b8aafa3be70b65df0716 SHA-256: 2fb83faf4ff13f448e8ae712798918001e32a2750964e1d6a5dc3007c6d5a697
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan' and an ML classifier indicating high maliciousness. It contains numerous embedded URLs pointing to potentially malicious domains, suggesting an attempt to redirect users to phishing or malware download sites. The document body, though heavily obfuscated, appears to contain keywords related to search queries, reinforcing the lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 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://vilenefex.ru/wix?keyword=stefan+zweig+books+in+order PDF link annotation
    • http://ukrinsure.com/which_medicine_is_used_for_covid_19_in_ukigqx4.pdfIn PDF document text
    • https://dufeduvu.weebly.com/uploads/1/3/4/4/134481569/vujipatagim.pdfIn PDF document text
    • http://1xbet-registr.site/powershot_pro_stapler_8000_staplesuxpli.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470220/normal_60110017d580f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4406776/normal_5fde37f56d58b.pdfIn PDF document text
    • http://deutschebank-meine.com/lenovo_g50-80_ram_slots3ou20.pdfIn PDF document text
    • http://abanca-electronica.com/95069692328pn1yj.pdfIn PDF document text
    • http://grusha.space/histological_staining_lab_reportjur6g.pdfIn PDF document text
    • https://jofomozali.weebly.com/uploads/1/3/5/3/135387403/kajufobupumeve.pdfIn PDF document text
    • http://mif-smeh.space/can_you_escape_6_level_31zydqt.pdfIn PDF document text
    • https://zipapujemufosir.weebly.com/uploads/1/3/5/3/135392102/de61feb9d.pdfIn PDF document text
    • http://lnstagram-help-businesss.com/79110671811x7cin.pdfIn PDF document text
    • http://55571.ru/orthographic_projection_tutorialw7n6g.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402478/normal_6016b5a457160.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/perurulexi/alcatel_3l_phone_specifications.pdfIn PDF document text
    • https://9e7b01ce-91ce-414a-93c5-ade8df4b7359.filesusr.com/ugd/cfbfd2_d1062d1a4dc54ec3a336c21f8ff0fb4b.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/lodazojamuva/short_stories_for_kids_in_tamil.pdfIn PDF document text
    • https://s3.amazonaws.com/numegubowalonan/hampstead_md_police_reports.pdfIn PDF document text
    • https://s3.amazonaws.com/wolawatin/xetalafitipibola.pdfIn PDF document text
    • https://11484d69-1612-41b9-9199-165df1f08223.filesusr.com/ugd/e2f197_f7cb41ef14f742a19d05f677e0c89bf0.pdf?index=trueIn 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_off0001434c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1434C 5492 bytes
SHA-256: 6d49f31cb8f6179859363ca4fb515c2f3fe0b46402688d8686363dae69dda341
font_01_sfnt_off0001562a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1562A 13968 bytes
SHA-256: 56bb6323121ac8a84b1f97024b31926cc2bbd4322ace6c6e24f4bd049be12394

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