Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b7259472e775270…

MALICIOUS

PDF

77.8 KB Created: 2021-04-09 03:51:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: b5b5f5644f3a2120850a3e8d3bba6b98 SHA-1: 15ff9e7cb0fc8429f7aea3d164e22ae8d178218e SHA-256: 7b7259472e775270391472306c446ca9a52b8d4fcc9edc2975a6bdabe5de8b7a
186 Risk Score

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 0.9998

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://druttle.ru/strik?utm_term=can+i+send+mail+to+my+local+post+office PDF link annotation
    • http://migukoto.22web.org/bookkeeping_workbook_for_dummies.pdfIn PDF document text
    • https://cdn.sqhk.co/kajurineg/oxibYia/casse-_o-_player_for_pc_download.pdfIn PDF document text
    • https://cdn.sqhk.co/tezizejaropu/ajefNbz/joxon.pdfIn PDF document text
    • https://cdn.sqhk.co/pulijidapis/ejahegi/javascript_datetime_format_example.pdfIn PDF document text
    • http://katomowubi.iblogger.org/vulifiteregugene.pdfIn PDF document text
    • https://wukelefitifaka.weebly.com/uploads/1/3/4/8/134882985/9281764.pdfIn PDF document text
    • https://cdn.sqhk.co/jipazebej/C1jfY7I/69294408.pdfIn PDF document text
    • http://wozovumorawoka.sportsontheweb.net/84204695554.pdfIn PDF document text
    • http://fafasun.iblogger.org/kenomanetunedipomemub.pdfIn PDF document text
    • http://serovakarara.mygamesonline.org/le_bilinguisme_et_le_plurilinguisme.pdfIn PDF document text
    • https://kitorulefif.weebly.com/uploads/1/3/4/3/134331375/2467563.pdfIn PDF document text
    • http://wodekenizowa.getenjoyment.net/bazowuvugetag.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gagolabirej.atwebpages.com/free_download_oxford_dictionary_english_to_urdu.pdfIn PDF document text
    • http://rasijubesu.epizy.com/noun_gender_in_spanish_worksheet.pdfIn PDF document text
    • http://nanakoje.epizy.com/hey_you_pink_floyd_lyrics.pdfIn PDF document text
    • http://noratev.myartsonline.com/kizopirerabamulapavadu.pdfIn PDF document text
    • http://puwurivetib.epizy.com/baixar_programa_free.pdfIn PDF document text
    • http://fitizoluwa.epizy.com/lagu_yang_terdalam_lyrics.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f4e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4E9 5212 bytes
SHA-256: 5ef585516a0f74d193bf770dfd0679552cb7537529d8a7ecf44d0a2b75c48382
font_01_sfnt_off000106a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106A0 10500 bytes
SHA-256: 39fc7d28078f20bad3aa3000b14cf16d859485e58153aae703a162f4b378c546

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