Malicious PDF — malware analysis report

Static analysis result for SHA-256 1acd8c3d88d4a7df…

MALICIOUS

PDF

72.7 KB Created: 2020-11-24 03:20:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: c0be9fad3f2fe7d6f62b09e5a5d4e47b SHA-1: 7cd6d8148279a7ba7787c9e3484f6afc53239099 SHA-256: 1acd8c3d88d4a7df09dfb508c74061f7b5705be5897241c7a05842d342f895da
214 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with several pointing to known malicious redirector infrastructure. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the document structure and embedded URLs suggest a phishing or content-luring attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • 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://gettraff.ru/aws?utm_term=alto+sax+songs+sheet+music In PDF document text
    • https://zafozudakajadev.weebly.com/uploads/1/3/0/8/130814863/b628c54eef4e3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457838/normal_5fb767d44e3f1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462974/normal_5faa8a2fcac11.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416932/normal_5fb74997493e4.pdfIn PDF document text
    • https://puliwavigajog.weebly.com/uploads/1/3/4/4/134469254/suwizan.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402517/normal_5fa7c5d74e659.pdfIn PDF document text
    • https://revokaraso.weebly.com/uploads/1/3/4/3/134320841/a39c9f2759f.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/6320aab9-de1a-4665-9cad-b45d39f21f08/vakemozagisufise.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0caa25c0-bf8b-4a76-99a4-dee3e5ef66b6/80975461858.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/39bbaccf-829f-4d7c-86a9-8e250aac5c9d/how_deep_is_your_love_bee_gees_chord.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1aea5685-2ee3-4378-b093-38d3d53b33bb/music_in_theory_and_practice_answer_key.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/19f5e821-5208-4361-8d90-4818cceabc21/xiraxejabewukuz.pdfIn PDF document text
    • https://s3.amazonaws.com/susopuzupure/wusugobudo.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_off0000e194.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE194 5176 bytes
SHA-256: a87c9e17f3caa244e6ae8439554c931a9a108d5920895126ee00354c4d4f7004
font_01_sfnt_off0000f30f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF30F 10480 bytes
SHA-256: 6ec6f3a96b1db43a32bc203e274a6ea95a0596faa37fcd68e78ef32b4cc458b1

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