Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a0a1d4ccb9e4c30…

MALICIOUS

PDF

74.8 KB Created: 2021-03-10 04:58:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 347a0b9a83deb8d4139b43f8ed112506 SHA-1: 61eea7fe59b9c89a2b500add3e405ca71ea2da9f SHA-256: 1a0a1d4ccb9e4c303e57ef9efad25c9432a4bda6d66d07705abd70a6951b137d
222 Risk Score

Malware Insights

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

The PDF contains multiple heuristics indicating malicious intent, including a critical finding for a malicious redirector link and a PDF link farm. The ML classifier also strongly flagged this PDF as malicious. The embedded URL points to known malicious infrastructure, suggesting a phishing or malware distribution attempt. No scripts were extracted, but the PDF structure itself is indicative of a malicious lure.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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
  • 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://crophysi.ru/123?utm_term=casting+crowns+only+jesus+audio In PDF document text
    • https://gukaguse.weebly.com/uploads/1/3/1/3/131398473/juxunezu.pdfIn PDF document text
    • https://kegegofelev.weebly.com/uploads/1/3/2/6/132681159/1456706.pdfIn PDF document text
    • https://gavozosalaz.weebly.com/uploads/1/3/1/1/131163920/7511031.pdfIn PDF document text
    • https://dowibowaxetejoz.weebly.com/uploads/1/3/0/7/130740522/2550572.pdfIn PDF document text
    • https://falusawo.weebly.com/uploads/1/3/6/0/136084102/kamixibabonexe-zefazulaz-dubebil.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/fukezavazuj/80302878890.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/df0428ad-92a8-4d29-a423-423a1ae3eee2/cyberpunk_never_fade_away_mission_music.pdfIn PDF document text
    • https://s3.amazonaws.com/semuxemakaw/wet_hands_minecraft_piano_sheet_music.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1d92196c-1fcc-49bc-973b-64e302f533d4/95209499367.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b0fed2b5-ba34-4c2c-aeb2-fe0d6cf9ecfc/john_carlton_allstate.pdfIn PDF document text
    • https://s3.amazonaws.com/venunamazozuzo/wedding_march_mendelssohn_organ.pdfIn PDF document text
    • https://s3.amazonaws.com/turip/events_template_wordpress_free.pdfIn PDF document text
    • https://s3.amazonaws.com/luramamelolem/birafokexijozuto.pdfIn PDF document text
    • https://s3.amazonaws.com/guxosa/grammar_and_style_coordinating_conjunctions_worksheet_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eb739bcf-f295-4245-8c64-00729752689c/33994140834.pdfIn PDF document text
    • https://s3.amazonaws.com/davubewu/yaquina_bay_fishing_report.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2766dcdb-cc50-4f10-b7c9-a175a45321c5/fusugiko.pdfIn PDF document text
    • https://s3.amazonaws.com/pulujolatepuv/zuwilelilegiwesijivevaz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6b700c3e-ab0f-4374-9c05-3a7883dd07a1/suzuki_violin_book_1_piano.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6f9cee22-ad49-416e-879b-cfdf2148acc6/vocabulary_tests_for_beginners.pdfIn PDF document text
    • https://s3.amazonaws.com/jarirotexab/graphs_of_parabolas_vertex_form_worksheet_answers.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000df84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF84 5280 bytes
SHA-256: e0cc8755fbeb675244c3c04e57f8207e670b8befe86c2d8c9c10b4b1ea98b095
font_01_sfnt_off0000f194.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF194 1796 bytes
SHA-256: 68bbe42c93759ab90c218695aa25c1747b40456063d11b0ac06b51d2514fd3e6
font_02_sfnt_off0000fa1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA1F 10292 bytes
SHA-256: 26989dc434109e6fe7ce8f4855f6979f2f6675ee9579235bbf483aa0b3ad46df