Malicious PDF — malware analysis report

Static analysis result for SHA-256 2555cd1059c541f0…

MALICIOUS

PDF

65.8 KB Created: 2021-04-04 13:13:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a76428e1de90119de00c2e467d85bde5 SHA-1: a5acd53e29f2191023584af818cb84a3ed92a405 SHA-256: 2555cd1059c541f03a40ed4f22defb5c8dde484616288b83b77c2649806753a2
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to Weebly and other free hosting services, indicating a link farm designed to distribute traffic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and extensive link farm are indicative of a malicious campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://nokidekuget.weebly.com/uploads/1/3/4/6/134669445/ce6263618d5.pdf
    • https://cdn.sqhk.co/xarepunekifa/o76tYja/nafimop.pdf
    • https://vikurevago.weebly.com/uploads/1/3/1/6/131606257/metugani_gekujotejowen_fukox_vexetodo.pdf
    • https://dubuzosokiboxof.weebly.com/uploads/1/3/1/1/131163723/wemevirelituka.pdf
    • https://cdn.sqhk.co/diwiporeb/fjhVGFv/detroit_become_human_menu_android_actress.pdf
    • http://ripugusulufiluj.getenjoyment.net/78895692055.pdf
    • https://cdn.sqhk.co/goluxewimabu/ihieOgj/callaway_preowned_free_shipping.pdf
    • http://vituloza.sportsontheweb.net/66495038952.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://feedproxy.google.com/~r/wb/ENAH/~3/Ecv9gJ3Ok6E/wb?keyword=howard%20miller%20grandfather%20clock%20lock%20and%20key
    • https://uploads.strikinglycdn.com/files/3c59f54b-ba71-4253-b5ec-4f9e4b124e95/fine_woodworking_magazine_reviews.pdf
    • https://s3.amazonaws.com/jupevuxirapi/dezukoz.pdf
    • https://s3.amazonaws.com/mexavofezoxi/chicco_keyfit_30_weight_with_base.pdf
    • https://71f68c9c-1037-483c-a0ca-f268b7ddd3c8.filesusr.com/ugd/87fdc7_2752cc2f58ef4055b25a2f1655761c97.pdf?index=true
    • https://3926d074-74ab-41cc-aa9d-340192ccda4e.filesusr.com/ugd/5619e7_95b447e30e6249808ed3a0a6bb6b605c.pdf?index=true
    • https://uploads.strikinglycdn.com/files/37f71f3a-b35e-4937-84ed-bf180b79ef5f/96192997540.pdf
    • https://uploads.strikinglycdn.com/files/39daee27-a3c5-4386-af08-2be530c4911a/lanijaduzopuniroxeresi.pdf
    • https://s3.amazonaws.com/nunakixuma/lippi_green_english_with_an_accent.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c3e6.bin
16130eeaab7f5bcffd991716c9e0e6d69bad1ac5310e5e05fb2cdf05ef09a22f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC3E6 5476 bytes
font_01_sfnt_off0000d675.bin
73ee7e375d86e7a9ca416a67803f6553858c64922654756823007b4001bdf2c7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD675 10440 bytes

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