Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ec81d52309c152c…

MALICIOUS

PDF

67.6 KB Created: 2020-11-19 02:36:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: ff133a717475967d9d9650fa08b18c19 SHA-1: 15e50c4c0d5d2f08ee9dce109b551e3c499c357d SHA-256: 5ec81d52309c152c5591510dd101149d920332eb6d55d1ee7707dff57dfa7649
96 Risk Score

Malware Insights

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

The PDF was flagged by multiple heuristics, including a machine learning classifier and ClamAV, indicating malicious intent. An embedded URL points to a suspicious domain, likely for phishing purposes. While no scripts were explicitly extracted, the PDF structure and embedded URI suggest it's designed to redirect users to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://trafffi.ru/strik?utm_term=audio+technica+ath-+m50x PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4409606/normal_5f9a2c017a52e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379982/normal_5f8fb6a460199.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365563/normal_5f9cfa5b17aef.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393359/normal_5f9b0f368d0c5.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/47ea334c-c150-4577-85b0-48655cdd3039/turpentine_and_sugar_home_remedy.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6bdd3b79-ea87-4107-8dec-2c283ce51991/artemis_fowl_graphic_novel_reading_level.pdfIn PDF document text
    • https://s3.amazonaws.com/mijumomub/chota_bheem_title_song_in_tamil.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/851eb5bd-4e4b-4244-92b1-f2e22fca06db/risubavif.pdfIn PDF document text
    • https://s3.amazonaws.com/rixevozajixezos/clear_java_cache_linux_command_line.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/00b6efa9-d7eb-49c2-93b8-9a98ae3d79ae/ed_sheeran_castle_on_the_hill_lyrics_deutsch.pdfIn PDF document text
    • https://s3.amazonaws.com/fasanag/79212783601.pdfIn PDF document text
    • https://s3.amazonaws.com/nuxulikiwab/history_of_spinal_anaesthesia.pdfIn PDF document text
    • https://s3.amazonaws.com/gujutavevive/acid_alkaline_forming_food_chart.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_off0000cb07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB07 5228 bytes
SHA-256: adb8ed37bcc03ca867fed9c4c65161cb9b7b686cdfe69f4b9ca5978da8e154ab
font_01_sfnt_off0000dcc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCC0 11096 bytes
SHA-256: b0170a9f00bf38c7eb26783aef9afb2ae68bbba0b0a6b1db8a527551072c9610