Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0a632caff1307dc…

MALICIOUS

PDF

69.2 KB Created: 2021-02-15 09:59:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 85f7dd0a63747024afefb2aaa19d8cb4 SHA-1: 5415d862eab993670256490060729afe8f055c2b SHA-256: b0a632caff1307dcb767ca8cf2959aa165660c7c0a32ea0d21e5894d33e79995
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1204.002 Malicious Link

The file was flagged by multiple heuristics as malicious, including brand-impersonation credential phishing and a general ML classifier. The presence of numerous external URIs, many pointing to disposable hosting or redirectors, strongly suggests a phishing campaign. While no scripts were explicitly extracted, the PDF structure and embedded URIs indicate it's designed to lead the user to malicious content, likely a credential harvesting page.

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
  • Brand-impersonation credential phishing lure critical SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: action link to abused redirector https://sojozukajarab.weebly.com/uploads/1/3/4/2/134265810/e8124.pdf.
  • 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://leonvi.ru/123?utm_term=first+national+bank+of+granbury+online+banking PDF link annotation
    • http://vertigoa.online/report_format_in_excelkxeb6.pdfIn PDF document text
    • http://bigchance.pw/first_steps_for_math_olympianstenlm.pdfIn PDF document text
    • https://sojozukajarab.weebly.com/uploads/1/3/4/2/134265810/e8124.pdfIn PDF document text
    • http://pomirkapa.site/2995782515299ke2.pdfIn PDF document text
    • https://bigonokefexix.weebly.com/uploads/1/3/4/5/134518339/matijixagorut_nuduwe_tafufowe.pdfIn PDF document text
    • https://renesixedobalew.weebly.com/uploads/1/3/0/9/130969137/vapuxuvibawesugez.pdfIn PDF document text
    • http://musc-media.xyz/3453199742s39q5.pdfIn PDF document text
    • http://uggi-ugg.com/97460838472z8hpr.pdfIn PDF document text
    • http://trastqort.online/ion8650_technical_datasheetch5na.pdfIn PDF document text
    • https://zipuwuxa.weebly.com/uploads/1/3/4/3/134376087/latixaja_butojekugized.pdfIn PDF document text
    • https://vojumemij.weebly.com/uploads/1/3/4/4/134473557/6617658.pdfIn PDF document text
    • http://namelesssouth.xyz/nidunuralofofidewinadgu9bc.pdfIn PDF document text
    • http://trells.space/food_cost_analysis_excel_templateoiiiv.pdfIn PDF document text
    • https://cdn.sqhk.co/fovomesit/jjmhfgi/lumojilojefatuwemir.pdfIn PDF document text
    • https://cdn.sqhk.co/bitizulokiva/yYMrjd8/17868408707.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://levolavajoji.epizy.com/canadian_buyers_guide_to_life_insurance.pdfIn PDF document text
    • http://pexefenebize.epizy.com/break_off_your_back_song.pdfIn PDF document text
    • http://wefexafunedex.epizy.com/91790709580.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_off0000d0ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0AD 5196 bytes
SHA-256: c6ea7d837530e044aa2aab3e56890880f21b2bee4a055040ea290a5232e02367
font_01_sfnt_off0000e27c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE27C 10780 bytes
SHA-256: 3840a57e2cff7b97345e23c4360e748cf523e5f4aeff5a635c05ff51f866fbfa

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