Malicious PDF — malware analysis report

Static analysis result for SHA-256 8742a0a2890155fc…

MALICIOUS

PDF

69.0 KB Created: 2020-11-25 18:56:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 4a038d1eac454a90bcf67d23a0114774 SHA-1: 170ed19141a33253b27b44ff0aa2723790fe2858 SHA-256: 8742a0a2890155fc5f2d5da20a3e826b3e104444974a76edcb23e18751152402
214 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded links, many of which point to a redirector infrastructure. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' and 'PDF_SEO_LINK_FARM' indicate a strong attempt to direct users to potentially harmful sites. The ML classifier and ClamAV detection further support the malicious nature of this file, likely used as a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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/123?utm_term=wv+birth+records+online In PDF document text
    • https://jetijejage.weebly.com/uploads/1/3/4/3/134319548/5965011094ccd2.pdfIn PDF document text
    • https://kusanogiwaxug.weebly.com/uploads/1/3/0/8/130873987/bakigomegomir-nasimagelam-biwulebubikid-povisavage.pdfIn PDF document text
    • https://jofesubuz.weebly.com/uploads/1/3/4/7/134775001/8e6960c.pdfIn PDF document text
    • https://jurexufibemoso.weebly.com/uploads/1/3/4/3/134310147/7630308.pdfIn PDF document text
    • https://gakuzelidojipo.weebly.com/uploads/1/3/4/3/134395763/wajurawus.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/239effce-772b-485c-bc34-26904974a100/patuwarigabozete.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b5db9f41-ec01-43a1-bd53-f35e570ad4d8/zisozotizutolubasufajib.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d94944f3-4d64-49df-9c3f-c772789f7c87/samakuxifovaziguwet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2e8f31a8-523a-4d71-803a-e5a835357e45/play_services_apk_download.pdfIn PDF document text
    • https://s3.amazonaws.com/tofizo/57932589168.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bb369995-cf29-4922-84f8-4cc58cb32cfd/kopibojo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/01d52895-8d10-450b-8aa1-962b9a943943/baadshaho_movie_filmyzilla.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cd83eb31-117c-46d0-9158-59acb230a6d8/ligunaselij.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ec3949cc-c615-44a1-bac2-ebe34e9170f8/panasonic_nn-ds596bbpq_recipes.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_off0000d0ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0AC 5032 bytes
SHA-256: 121afcb3cfa5923d64cd7802f9edbf11543c6d5d31ccc553d985efdf83f803ce
font_01_sfnt_off0000e1d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1D4 11676 bytes
SHA-256: c087081ed13cc13528064bd56769bd671f6fd6c97ffcc2b19af6316bc4dec16e

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