Malicious PDF — malware analysis report

Static analysis result for SHA-256 246777190f115b25…

MALICIOUS

PDF

64.0 KB Created: 2020-12-25 10:06:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 7256fb3392ffb735c02ef9cfbc307e2f SHA-1: 90151112575931cd5598d563d04bd9e2da65f752 SHA-256: 246777190f115b25d4e4dd384e36b976f8773fc2c2428cc98a72c523f6722c1f
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a significant number of external links, identified as a link farm, suggesting a malicious intent to redirect users to potentially harmful websites. The ClamAV detection and ML classifier strongly indicate maliciousness, with the primary technique being Spearphishing Attachment due to the nature of malicious documents. While no scripts were explicitly extracted, the PDF structure and embedded URIs point towards techniques like JavaScript execution for further payload delivery or redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://traffnew.ru/123?utm_term=miriam+mozes+zeiger+cause+of+death PDF link annotation
    • https://jukafubu.weebly.com/uploads/1/3/0/8/130874261/f02011.pdfIn PDF document text
    • https://jedunifoxawixe.weebly.com/uploads/1/3/4/4/134458330/41e198349e2c73c.pdfIn PDF document text
    • https://cdn.sqhk.co/xevuvuxene/jj8zkb5/pirates_of_everseas_halloween_event.pdfIn PDF document text
    • https://vifexaxelis.weebly.com/uploads/1/3/4/4/134482988/malejevalal.pdfIn PDF document text
    • https://cdn.sqhk.co/xulawajikigi/fijigpk/youth_hockey_training_videos.pdfIn PDF document text
    • https://cdn.sqhk.co/baxemazisod/icxhiHh/12193105736.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/f5fa5c2d-6559-43e4-b89d-d5be31103b4d/formal_amendment_process_definition_ap_gov.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c41138dc-2615-4ae6-9a0f-6cddfc6f3821/63149588817.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4104ff63-9f38-40e5-ac1e-63d05697ce08/cisco_certification_tracker.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/feb27303-345f-49c5-801f-46f537205653/angles_in_parallel_lines_worksheet_basic.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/718a4672-92f2-4d49-be83-10700eecc475/ruwuzo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ffe17be0-4949-49ae-8380-b08753df732f/bobs_burgers_cookbook_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/21bf4a5a-6aa1-40d2-b4cf-08a54507f113/using_similar_triangles_to_find_slope_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
    • http://www.geocities.com/mitra_anirban/hobbies.htmGNUIn PDF document text
    • http://www.gnu.org/copyleft/gpl.htmRegularIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b409.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB409 5460 bytes
SHA-256: d91bfff7ab2365f07cacaf508e8d1e3656c6ad76df81f73be1a08460eda2debd
font_01_sfnt_off0000c681.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC681 3720 bytes
SHA-256: b91f3c26f37c28538ed09035cbea6f9221827f1e30b50c452f08cc820bcc167b
font_02_sfnt_off0000d1e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1E3 9176 bytes
SHA-256: b91351d7fdde3e0436ecf118b9ce97bf9d420174275aa01292e05d1576b5cc2e

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