Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5300b9b2c9e6215…

MALICIOUS

PDF

77.2 KB Created: 2021-04-23 20:13:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 7bfd3fa88712a494c4cee98ce26be8c0 SHA-1: e9f5838aaf27b4dd0e0a5d6203395da20b02c245 SHA-256: a5300b9b2c9e62154afa3709542281e9e5285cd5c6bf8d7feb35ac6daa4d3f29
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document contains multiple embedded URLs, with one specifically mentioning 'asus router rt-n56u reset password', suggesting a phishing lure. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' indicates the document may be part of a multi-stage attack where a password is provided to decrypt a subsequent payload. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://ponafet.ru/strik?utm_term=asus+router+rt-n56u+reset+password PDF link annotation
    • https://cdn.sqhk.co/gekobegij/ejfeVje/how_to_get_teacher_assistant_certification_in_texas.pdfIn PDF document text
    • https://cdn.sqhk.co/tilafukefuwe/yjhgjCY/pakisewilizavukufagubi.pdfIn PDF document text
    • https://biziliwedurukax.weebly.com/uploads/1/3/4/8/134889104/ziwiroki-sojedupofo.pdfIn PDF document text
    • http://zinefikitozozeg.sportsontheweb.net/xavulunelalenodumiluraza.pdfIn PDF document text
    • https://deremufirig.weebly.com/uploads/1/3/4/8/134854029/6141597.pdfIn PDF document text
    • http://gilumesu.mypressonline.com/70710947255.pdfIn PDF document text
    • https://cdn.sqhk.co/kitujesijak/gcNIhd5/rgb_led_controller_fix.pdfIn PDF document text
    • http://jisorozasakima.iblogger.org/best_ppt_background_free.pdfIn PDF document text
    • https://gawakugoful.weebly.com/uploads/1/3/4/7/134757428/f5a2029.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bofujenarabi.rf.gd/flow_cytometry_notes.pdfIn PDF document text
    • http://mebewoxesare.epizy.com/l_accord_de_paris.pdfIn PDF document text
    • http://mawidinivetobi.myartsonline.com/ageism_in_america.pdfIn PDF document text
    • https://s3.amazonaws.com/diwitapezu/how_many_times_to_do_sudarshan_kriya.pdfIn PDF document text
    • http://wororezijetixa.atwebpages.com/62389952496.pdfIn PDF document text
    • http://kepagewav.atwebpages.com/tabafajanabazagexemigawam.pdfIn PDF document text
    • https://4bd9ed84-c80b-4837-bb2f-b1353ebfd8aa.filesusr.com/ugd/5a1791_97f5c481bc57497cbf0e744b0f44140c.pdf?index=trueIn PDF document text
    • http://gateguka.epizy.com/risk_matrix_project_management_template.pdfIn PDF document text
    • https://ddb281da-11d2-423e-b83a-408ecf1f607f.filesusr.com/ugd/9db61c_aa6161b03a6a4873a8f66bebe987b2da.pdf?index=trueIn PDF document text
    • http://jegovogetaferop.epizy.com/zokenumokogunano.pdfIn PDF document text
    • https://s3.amazonaws.com/gonasidupij/how_to_draw_a_cartoon_girl_step_by_step.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_off0000f0f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0F4 5312 bytes
SHA-256: 6ed5784e73976de1a60e1e65825e7c8bfe1a2752c99f8a2f33fe4085018d22ea
font_01_sfnt_off0001032c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1032C 10792 bytes
SHA-256: c346016680efc3d62321c85f8d7929f1605f47088093b7ddc9b25d1152db0c8d

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