Malicious PDF — malware analysis report

Static analysis result for SHA-256 77973217a1a3a5ce…

MALICIOUS

PDF

75.8 KB Created: 2021-05-13 00:20:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: df9eba3408474ff1b91f43eb6863f4fd SHA-1: b1a0316f13249bcdc94ee7a1232f9998d52449f3 SHA-256: 77973217a1a3a5ced3c8d8e3ef003133709f3c6ab47a1359555570c0c6d48e5f
194 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF document exhibits multiple indicators of malicious intent, including ML classification, ClamAV detection as a phishing trojan, and heuristics flagging it as a brand-impersonation credential phishing lure. The document contains embedded URLs and a link farm structure, suggesting it is designed to redirect users to malicious sites. The presence of invoice or payment-related language further supports the phishing pretext.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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://ruzoriro.weebly.com/uploads/1/3/5/9/135975417/1003214.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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://druttle.ru/strik?utm_term=is+there+a+quickbooks+for+churches PDF link annotation
    • https://cdn.sqhk.co/gudijupimeb/h4digry/4_immagini_1_parola_4_lettere_soluzione.pdfIn PDF document text
    • https://cdn.sqhk.co/wumerelup/jchdOg1/microsoft_teams_login_issues_after_password_change.pdfIn PDF document text
    • https://cdn.sqhk.co/lojibuwe/hjaygdq/baixar_hamachi_2019.pdfIn PDF document text
    • https://ruzoriro.weebly.com/uploads/1/3/5/9/135975417/1003214.pdfIn PDF document text
    • https://cdn.sqhk.co/zojoguxuban/sNjdjeO/sexuvikuxi.pdfIn PDF document text
    • https://wilumixomili.weebly.com/uploads/1/3/1/4/131483065/bitetevemu_mexidiso.pdfIn PDF document text
    • http://zogorezipakafit.iblogger.org/kivuja.pdfIn PDF document text
    • https://muwalivom.weebly.com/uploads/1/3/2/6/132695892/lolemixezade.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375339/normal_5fe2bca21c4f6.pdfIn PDF document text
    • https://buvonage.weebly.com/uploads/1/3/0/9/130969236/bosodatesawi-kotuvijegeveru.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4410976/normal_5fe11679f28e1.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/jajoxulabojaso/carry_on_jatta_full_movie_worldfree4u.pdfIn PDF document text
    • https://9db8f275-5044-409a-aa1b-3306d9dda9bd.filesusr.com/ugd/361f4b_64e2877b5228414db51570fcf478fe83.pdf?index=trueIn PDF document text
    • http://nopetavu.rf.gd/pogitamikoderimuwuretama.pdfIn PDF document text
    • https://s3.amazonaws.com/bajapovogam/xudimafeg.pdfIn PDF document text
    • https://97a45c9e-1ab5-462a-bfe2-fded34b9a8b9.filesusr.com/ugd/b50c55_d7001c59bd03417d8369592836ffb9fa.pdf?index=trueIn PDF document text
    • http://zekubegem.epizy.com/pobaforilufovawobal.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_off0000eb07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB07 5204 bytes
SHA-256: 83ac84a5d26bff0f168c1484302536797c3584860e7c085dca53cdc6255d3b30
font_01_sfnt_off0000fcb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCB9 11100 bytes
SHA-256: 962e262d8ee89f739edd900a61d269268c82feddfe148cf3bb1f2a807d376bc3

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