Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a005eb7c809d37a…

MALICIOUS

PDF

39.2 KB Created: 2020-10-07 20:53:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 4daca66adbee40f372aeee28427b9391 SHA-1: ab7ae10440af72c3e64b51fc34f0e0192e936740 SHA-256: 5a005eb7c809d37a3c4e2faacaac008c9fcdb70987ce7692f03ccf1937f3d76f
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to external resources, a technique often used for SEO manipulation or to host malicious content. One critical heuristic identified a link to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains text that appears to be a lure for educational material, further supporting a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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://cctraff.ru/strik?keyword=miller+and+levine+biology+pdf+chapter+21 In PDF document text
    • http://lonemepe.jewelrybycynde.com/uploads/1/3/0/9/130969317/8147586.pdfIn PDF document text
    • http://files.kingimusic.com/uploads/1/3/2/6/132682787/6513127.pdfIn PDF document text
    • http://files.victoriasongweisoprano.com/uploads/1/3/1/4/131437242/fezagonedubutazas.pdfIn PDF document text
    • http://files.conwayfeedandgarden.com/uploads/1/3/0/7/130739155/45ec9cfe8f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0127/3758/files/english_luxury_car_brands.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/7319/1580/files/rarijiberexotimufos.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/7571/5743/files/39871253096.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0476/7137/8086/files/totirazibizazos.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0485/2062/6331/files/tavononemokojokif.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/9257/3336/files/gixusim.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2f675582-6887-4a3d-bd63-fd66ab61231d/50235949094.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/93b0ea7b-bbe9-41ee-b9ad-312c8a18b7e2/31953966459.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3b9c8a11-32ee-41a4-be7b-26b70ed7d6e5/69414540665.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/143d07e9-7172-48dc-acd2-7a6e1ff4b464/2127275632.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/404ae375-3eab-4227-9044-0c87c1963571/bidareneje.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_off00005a8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5A8D 5732 bytes
SHA-256: 315ebd386e1d1df98e3a99ac38e79cd7c278c77572f36fb644ea53911c600657
font_01_sfnt_off00006e32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6E32 9880 bytes
SHA-256: e23816a7ea86738d3a3526c98a1e41874fe7c18c10c0c0ce6af75cfd0f8143b2

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