Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae46a9411ee393b0…

MALICIOUS

PDF

73.7 KB Created: 2021-05-18 12:59:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 5e8781ac83d5a2cea669dc18e8b673ad SHA-1: df37776a82ba4b5d1d93d92979a824ca9b9ecda3 SHA-256: ae46a9411ee393b08cfd1dde603d6c317cfc46d408bcf2d3de639e7d11e75287
134 Risk Score

Malware Insights

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

The PDF document contains an embedded URL that redirects to a suspicious domain, identified as a link farm on disposable hosting. Heuristics indicate this is a phishing attempt, likely to trick users into downloading a secondary payload. The ML classifier and ClamAV detection strongly suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://baarspo.ru/strik?utm_term=install+dymo+labelwriter+450 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4478961/normal_604b202661d87.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368503/normal_6057acfbba6c9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494888/normal_604bb9f96e0a7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387825/normal_605bb37b8fc71.pdfIn PDF document text
    • http://gejepixaso.iblogger.org/aritmatika_sosial_sd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405208/normal_600df844203ee.pdfIn PDF document text
    • http://zuxenegobepejij.22web.org/el_caballo_de_troya_libro_completo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4389581/normal_5ff3c52e5777f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391024/normal_6052ccd5ca577.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/d3c3d3a0-d46e-4bd9-b27e-3158e1d84932/how_can_i_increase_my_neck_length.pdfIn PDF document text
    • http://gaposajalumawes.rf.gd/50285077459.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b3cf2d8f-adc4-4d89-80dc-b360c7d179f4/lerubirozalerawodozijawof.pdfIn PDF document text
    • https://s3.amazonaws.com/toguvaju/bose_wave_soundtouch_music_system_iv_review.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c9feb1a6-2d71-4b6b-920a-a3d696519ed7/loputasok.pdfIn PDF document text
    • http://topemuzopapegu.epizy.com/61170364721.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/50d1f36c-22e1-432c-81bd-e22976dd548c/sogezuken.pdfIn PDF document text
    • https://s3.amazonaws.com/tamovagag/pojidikebopatogir.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b0e7026c-d2d3-409c-babd-3483018dad03/safivujorikiwodegizef.pdfIn PDF document text
    • https://s3.amazonaws.com/wozoxub/67834573631.pdfIn PDF document text
    • http://vonizupereru.rf.gd/74716653964.pdfIn PDF document text
    • http://retelowanudugut.epizy.com/billetes_didacticos_mexicanos_para_imprimir.pdfIn PDF document text
    • http://judejelalub.rf.gd/weight_loss_diet_plan_vegetarian.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_off0000e14b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE14B 5596 bytes
SHA-256: b1e3a764d73d1a486e701a4b4167a2781322b6c5b848fca9dc3aebedcae9cd54
font_01_sfnt_off0000f45d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF45D 10952 bytes
SHA-256: bbd70b54884eb29ea5944b588de359b285325ba021d3991ae4c1c4086fa7c67c