Malicious PDF — malware analysis report

Static analysis result for SHA-256 bab2f58a98353505…

MALICIOUS

PDF

76.8 KB Created: 2021-04-04 07:13:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 8287a74156f0f9f8b62bec695f2677db SHA-1: 60b2b05dd89ab2efca7222375b2c3d3516bedffe SHA-256: bab2f58a983535051b2afd639d94c94ef24745896d15347b03202fa43b016c43
226 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The file is identified as malicious by ClamAV and an ML classifier, and it contains numerous external links, suggesting a link farm or phishing attempt. The 'SE_CLICKFIX' heuristic indicates the document likely instructs the user to execute a command, a common social engineering tactic to bypass security measures. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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.
  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • 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=how+to+fix+a+wired+xbox+one+controller PDF link annotation
    • https://cdn.sqhk.co/rixutixim/Jjhgdgj/90139066991.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483097/normal_5fdbd5439002c.pdfIn PDF document text
    • https://cdn.sqhk.co/peferitukofa/f0CifWY/3d_light_fx_soccer_ball.pdfIn PDF document text
    • http://senteber.site/anti_reclame_app_androidzk2dl.pdfIn PDF document text
    • https://vavodegan.weebly.com/uploads/1/3/5/3/135398560/giwekutimixakupe.pdfIn PDF document text
    • http://expo-kit.ru/oklahoma_prentice_hall_world_history_the_modern_era_answersok954.pdfIn PDF document text
    • https://cdn.sqhk.co/pupevadojas/R9qMhbf/talon.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446170/normal_6029f7e0d7d5b.pdfIn PDF document text
    • https://xavodujur.weebly.com/uploads/1/3/5/9/135972692/vubitujezepiserudi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4457876/normal_60094d411b8ed.pdfIn PDF document text
    • https://cdn.sqhk.co/gisatajofo/Tiighbf/pojejasukizibinewinovok.pdfIn PDF document text
    • https://xewidepomizexas.weebly.com/uploads/1/3/0/7/130775014/95038cc1aa56.pdfIn PDF document text
    • https://cdn.sqhk.co/tabewinudeka/7BhbAx0/aliexpress_hair_wigs_for_sale.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4467926/normal_6005889a6618d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370051/normal_606484d51129a.pdfIn PDF document text
    • http://meriline.store/what_are_some_common_complex_carbohydratesx3e1c.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/puretulenuza/16368572941.pdfIn PDF document text
    • https://s3.amazonaws.com/sabegokek/azure_application_gateway_certificate_arm_template.pdfIn PDF document text
    • https://s3.amazonaws.com/poresi/report_illegal_immigration_workers_uk.pdfIn PDF document text
    • https://s3.amazonaws.com/mozedijiz/funny_and_dance_video.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_off0000efaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFAF 5096 bytes
SHA-256: 58e2f398a59b6ee514ac991ef4115b62458ffb13f1b890a00af6c9a5870302f9
font_01_sfnt_off00010127.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10127 10636 bytes
SHA-256: 5a5b00bbaa906f809e1bd0cdf366f555fd158176623f628c3d35f1565efbffb5