Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8a185b38c1ad7c6…

MALICIOUS

PDF

72.0 KB Created: 2021-02-21 23:43:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: c9375d5520222cb5d749dfd207abca96 SHA-1: f84aae00e158c5cda3e6348647ec62f0de4d4513 SHA-256: c8a185b38c1ad7c6050ef5b74b51ae5254ff0eeb65cf048ff8d014da4337b30b
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

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 0.9998

Heuristics 5

  • 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 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/strik?utm_term=first+alert+carbon+monoxide+alarm+blinking+red+light PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4393625/normal_5fee84767748e.pdfIn PDF document text
    • http://opensoda.pro/xixen9lw5f.pdfIn PDF document text
    • http://invitesistem.ru/free_financial_spreadsheet_excelhxdg9.pdfIn PDF document text
    • http://harkateine.fun/852815210402bv24.pdfIn PDF document text
    • http://fit-italy.space/56797126985n75ce.pdfIn PDF document text
    • https://gifenatewa.weebly.com/uploads/1/3/4/4/134480542/13f3028790ff2.pdfIn PDF document text
    • http://veronaital.space/galaxy_invaders_alien_shooter_gift_codes_for_android6xqyg.pdfIn PDF document text
    • http://flipping-car.online/46706072584nqrwc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427293/normal_600f2604abeff.pdfIn PDF document text
    • http://scm03.ru/gba_emulator_iphone_11_13._3._10j0j1.pdfIn PDF document text
    • http://koprovk.xyz/al_futtaim_private_company_llc_annual_reportonfgh.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4406455/normal_5fe48af4d58d6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470205/normal_602aeca600943.pdfIn PDF document text
    • https://bewevirat.weebly.com/uploads/1/3/1/4/131437926/xujenemelagak.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/lebaxa/lozizig.pdfIn PDF document text
    • https://s3.amazonaws.com/kegubinefuda/38381307655.pdfIn PDF document text
    • https://s3.amazonaws.com/diwitapezu/android_sdk_path.pdfIn PDF document text
    • https://s3.amazonaws.com/fuwuzerijofa/tepezesazomu.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_off0000d7e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7E5 5580 bytes
SHA-256: 3016feee96dc50919b200d7a9c2f8291e54bc1fdd7417dacb96be7b522649815
font_01_sfnt_off0000eab6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAB6 11908 bytes
SHA-256: c1f69c445c8d28a5aa647cd789be6a02685cfa62b79cce9f947f77d806e7179c

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