Malicious PDF — malware analysis report

Static analysis result for SHA-256 429542c506a8a9fd…

MALICIOUS

PDF

79.6 KB Created: 2021-04-18 17:58:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 355b72d9a673f6a7bdb39e19eaf30dd0 SHA-1: 5b2e78cca14a26a406add5131d7b3ed64c2ed85e SHA-256: 429542c506a8a9fd4b29267ed598114cbac54f1af568344243df42173a5789cd
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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://jottigo.ru/strik?utm_term=romeo+and+juliet+paragraph+writing+prompts+act+1+answers PDF link annotation
    • https://cdn.sqhk.co/takoxuwal/0jcjbid/sci_fi_wallpaper_4k_iphone.pdfIn PDF document text
    • http://patedeziw.mypressonline.com/math_in_the_modern_world_ched.pdfIn PDF document text
    • http://jogebavipe.iblogger.org/50196899086.pdfIn PDF document text
    • https://cdn.sqhk.co/rogenujudita/gd2geij/17915553044.pdfIn PDF document text
    • https://vemakovuzabomon.weebly.com/uploads/1/3/4/8/134881214/6490192.pdfIn PDF document text
    • https://lobumemimakagom.weebly.com/uploads/1/3/3/9/133999871/3005018.pdfIn PDF document text
    • https://rotasemenedifo.weebly.com/uploads/1/3/5/9/135985080/7230127.pdfIn PDF document text
    • https://cdn.sqhk.co/dejijadu/bgghhhe/xovax.pdfIn PDF document text
    • https://cdn.sqhk.co/letareximo/fjehdj0/78443447435.pdfIn PDF document text
    • https://cdn.sqhk.co/kokijunuxagi/hagelxf/iaastd_agriculture_at_a_crossroads_global_report.pdfIn PDF document text
    • http://wefufivubulal.medianewsonline.com/polovetujilatule.pdfIn PDF document text
    • https://cdn.sqhk.co/rufosopufu/5dgijcM/wodadabutamexemiwi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://rorazizaxaf.atwebpages.com/6165870844.pdfIn PDF document text
    • http://xujided.onlinewebshop.net/paranoid_personality_disorders.pdfIn PDF document text
    • http://nukivamo.myartsonline.com/xipiwizibusizu.pdfIn PDF document text
    • http://rujamodi.rf.gd/how_to_pass_organic_chemistry_final.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA76 5596 bytes
SHA-256: ef8f2e9077515dc3fd87fb79a0b33c5e04ca5db92ccacdb8478f15e9909ecde1
font_01_sfnt_off0000fd65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD65 11116 bytes
SHA-256: ddb4677ebda31d82d579e4a5ed131489b7c6a35a21f5ab79e9a760f838536231
font_02_sfnt_off000122bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122BC 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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