Malicious PDF — malware analysis report

Static analysis result for SHA-256 b81d426aa8c498b4…

MALICIOUS

PDF

74.4 KB Created: 2021-03-06 14:59:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-04
MD5: 65117c73db81eaf94ebee9387ec97acb SHA-1: 5f9916b02ee0951fa1f5616e0ed5695f6db4ca3e SHA-256: b81d426aa8c498b46d9daa981be8d537ceba1c56ee8d0bf34735be052102ff6c
96 Risk Score

Malware Insights

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

The PDF file contains a lure related to fishing, which is a common tactic for phishing or malware distribution. It embeds external URIs, including one that appears to be a malicious domain, suggesting an attempt to redirect the user to a compromised site or download further malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or trojan delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://golowaki.ru/123?utm_term=how+to+rig+corn+for+trout+fishing PDF link annotation
    • http://belkwigs.com/acrobat_reader_11._10_for_windows_79oe53.pdfIn PDF document text
    • http://carbackseat.site/35425864383p5sbf.pdfIn PDF document text
    • http://idealica-itufficiale.website/587034530239sdyb.pdfIn PDF document text
    • http://hightrade.club/zaxojesakipatamubijijogi3d7ny.pdfIn PDF document text
    • http://somixewavado.sportsontheweb.net/xetewixovijurepi.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/dewutexorob/eel_river_fly_fishing_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c8c79d86-f78a-4bde-be00-21130e941e11/how_to_charge_citizen_eco_drive_watch.pdfIn PDF document text
    • https://52468903-0e2d-47c5-babb-61e1d305d291.filesusr.com/ugd/32777b_c894500d280c4605bb56d2e0a0a67d6b.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vufupu/pujegokoxidiba.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3c82fce3-2d66-4b6a-8184-a4bc88725ca8/61683351394.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f19750d5-344e-471b-91bf-5394df8c9186/the_young_elites_fanart.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e4bf8122-de3d-4fdb-a3b0-861ee4cb0ce4/shure_blx_wireless_vocal_system_w_pg58_microphone.pdfIn PDF document text
    • https://s3.amazonaws.com/palevijuj/what_are_the_common_shapes_of_protein_molecules.pdfIn PDF document text
    • http://niwimugosaz.onlinewebshop.net/90786131582.pdfIn PDF document text
    • https://e06e8306-d71e-4c92-aa1b-e8c52eeb44cb.filesusr.com/ugd/bc4951_3f9084453fb7415e803a32ff70e77555.pdf?index=trueIn PDF document text
    • https://8d90b851-447f-4cfc-ac95-1e867b71b983.filesusr.com/ugd/b371d9_8df567915a654a5ba2a07c866786d934.pdf?index=trueIn PDF document text
    • https://cc67bef4-e22e-42fd-bf01-3f02b15f800b.filesusr.com/ugd/080020_b779db0570894e17a8cd6de97be09d36.pdf?index=trueIn PDF document text
    • https://c5c27394-2042-4749-9b39-d1c24dcbd9f0.filesusr.com/ugd/e9b987_fe3a7b6ef0e749b9a87efc8633ae8469.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/posaxugidut/incidente_campoformido_oggi.pdfIn PDF document text
    • https://08c3cc13-1ce0-4add-927e-a3aed263473e.filesusr.com/ugd/ccf397_f9babf6645704300b227a0c6548b366e.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vifusupegiza/zusejelub.pdfIn PDF document text
    • https://f59c0a4d-c104-43ac-8966-a5978cdf1b8c.filesusr.com/ugd/0c1ebd_7c5ce7b3e9174165b060f2742febb347.pdf?index=trueIn 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_off0000e773.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE773 4952 bytes
SHA-256: e4f57d6e87592b3715502ef3b8179de5fd9ebe480e88984a76113f418569faf3
font_01_sfnt_off0000f866.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF866 10472 bytes
SHA-256: 8b3b4df8feff0defea0adb662ace0272f939246187a14add4cb761bea0e36f20

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