Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c08132851ad8891…

MALICIOUS

PDF

86.9 KB Created: 2021-03-24 16:15:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 55ccd168b9e9c921fb1b41cadd75481e SHA-1: 909f1dea668b0d40dc9d7b58ed57dc2522b87314 SHA-256: 5c08132851ad8891436841115227e9079b476ef958233b69cd7be7530e8a15b6
126 Risk Score

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 0.9989

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://zajinet.ru/aws?utm_term=fitbit+versa+lite+apple+compatible PDF link annotation
    • https://letolikasepa.weebly.com/uploads/1/3/4/6/134625664/jixomejo_ragur_togiro_donuwavaladi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474722/normal_5fda2cd740141.pdfIn PDF document text
    • http://gewututikame.getenjoyment.net/amcat_logical_ability_questions_with_answers.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404122/normal_5fe8a72ece18b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375340/normal_6002ab85539a7.pdfIn PDF document text
    • https://wexabegolorumad.weebly.com/uploads/1/3/4/3/134351445/1630605.pdfIn PDF document text
    • https://wosubazaroden.weebly.com/uploads/1/3/0/8/130813518/5503376.pdfIn PDF document text
    • http://vovavipegum.getenjoyment.net/lakakozubix.pdfIn PDF document text
    • http://fumexijana.getenjoyment.net/how_do_i_connect_my_verizon_wifi_extender_to_my_router.pdfIn PDF document text
    • http://lazirog.mywebcommunity.org/what_is_the_most_energy_efficient_infrared_heater.pdfIn PDF document text
    • https://cdn.sqhk.co/nizufalagef/dif4Ihe/tevanojalipusolirufe.pdfIn PDF document text
    • http://sipataj.sportsontheweb.net/48372629269.pdfIn PDF document text
    • https://xesisezedowajax.weebly.com/uploads/1/3/4/7/134729639/wanumolufakowojowije.pdfIn PDF document text
    • https://cdn.sqhk.co/mitugejaxel/hei8icJ/74312432190.pdfIn PDF document text
    • https://minomawisagu.weebly.com/uploads/1/3/5/9/135956859/zikim.pdfIn PDF document text
    • https://cdn.sqhk.co/vadavenaw/cWSOcLC/6147622221.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380871/normal_604b8505377ea.pdfIn PDF document text
    • http://sifisomatexow.sportsontheweb.net/goldman_cecil_medicine_download.pdfIn PDF document text
    • http://zuxemesemubozo.mywebcommunity.org/mavubigojobefavivun.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4427274/normal_6001211432ea1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4495976/normal_6000ff7505ddd.pdfIn PDF document text
    • http://naxajogilelog.medianewsonline.com/graphing_slope_intercept_form_worksheet.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://ligiwekuxote.myartsonline.com/42296085799.pdfIn PDF document text
    • http://bujijawuta.atwebpages.com/amplificateur_oprationnel_non_inverseur.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001089e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1089E 4916 bytes
SHA-256: 8e89c42780cfba2b9e1e3d2582de8f9bf6ac195f15a694b5bba1d617e01a537a
font_01_sfnt_off00011953.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11953 11460 bytes
SHA-256: 789bf5763115c903db62ac5b4e9e0c7424feb3da459838c2171f6578c0cfcea1
font_02_sfnt_off00014009.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14009 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3