Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e2338c0820fe6b3…

MALICIOUS

PDF

120.9 KB Created: 2021-02-27 13:18:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 73f821a6d312b7403a8b12030f49e487 SHA-1: b3ed5e12ff6c4e943b44aad8408a5236107ec86b SHA-256: 8e2338c0820fe6b324d8159312523dda8bed3c2504d676afefd77d41bac7e802
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://resalured.ru/123?utm_term=is+statistics+for+social+sciences+hard PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4388163/normal_6030fa4dd8d08.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4456114/normal_5fff15081343a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4392656/normal_5fcaabb2ee04d.pdfIn PDF document text
    • https://nakofasojerurog.weebly.com/uploads/1/3/4/5/134592478/8639887.pdfIn PDF document text
    • https://jabevemejo.weebly.com/uploads/1/3/1/4/131483275/texirapize_vozijodosawozuk_zaxewifij_rewumabuzun.pdfIn PDF document text
    • https://nupimixek.weebly.com/uploads/1/3/2/7/132712066/pagexazixulovogasuje.pdfIn PDF document text
    • https://jovuwimuj.weebly.com/uploads/1/3/0/9/130969820/8526667.pdfIn PDF document text
    • https://libadelalisam.weebly.com/uploads/1/3/4/5/134579317/b4e24.pdfIn PDF document text
    • https://gujibukogise.weebly.com/uploads/1/3/1/3/131380045/a120851f3dde.pdfIn PDF document text
    • https://fudiditinip.weebly.com/uploads/1/3/1/4/131453724/zipeda_gomem.pdfIn PDF document text
    • http://gaturemani.22web.org/78120542339.pdfIn PDF document text
    • http://rumajasajobotod.iblogger.org/nice_guideline_heart_failure_2016.pdfIn PDF document text
    • https://tikekukitalil.weebly.com/uploads/1/3/2/7/132712015/kanojinube.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500665/normal_60373c7654c63.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/zerepuzuze/nezizebuxuwavop.pdfIn PDF document text
    • https://s3.amazonaws.com/silubebebefuju/79227535751.pdfIn PDF document text
    • http://notufexunu.rf.gd/shiva_112_sutras_in_hindi.pdfIn PDF document text
    • http://lowuzoduveloga.epizy.com/zetipuragaz.pdfIn PDF document text
    • http://sivokag.epizy.com/responsive_web_design_bootstrap_templates.pdfIn PDF document text
    • https://s3.amazonaws.com/kesumasaka/bewafa_song_lyrics.pdfIn PDF document text
    • http://marivugedada.epizy.com/keto_meals_au.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_off0001a02c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A02C 5048 bytes
SHA-256: 2b9dff46d6b99f90d10c2570383467017d53c3002458a6ffedd9d61469670853
font_01_sfnt_off0001b14d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B14D 10956 bytes
SHA-256: dab8f7dce048a9f95c9320026b86722fb08664f6d9ba6267f7523242e824f0d5

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