Malicious PDF — malware analysis report

Static analysis result for SHA-256 491dcd7a8fc4f83a…

MALICIOUS

PDF

62.6 KB Created: 2020-11-20 15:22:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c7fcafd9f46810c0cbd78106f3ccd948 SHA-1: 150b15af557d915943d3f095625258c1ba68757d SHA-256: 491dcd7a8fc4f83a05126c6036a957fbbfb13d68ac2e9272b8c48f1d70db1d7a
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 at least one pointing to known malicious redirector infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or SEO spam campaigns. No scripts were extracted, but the presence of numerous external links suggests the primary goal is to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://ggtraff.ru/123?utm_term=64+fluid+ounces+to+cups
    • https://cdn-cms.f-static.net/uploads/4381735/normal_5f97b5101cd1c.pdf
    • https://cdn-cms.f-static.net/uploads/4375696/normal_5f9d3279badd1.pdf
    • https://wenewemegidipep.weebly.com/uploads/1/3/4/6/134679414/lelisavuvuxorotib.pdf
    • https://cdn-cms.f-static.net/uploads/4419205/normal_5fafe8ad9592e.pdf
    • https://cdn-cms.f-static.net/uploads/4417648/normal_5f97ac3c4e5d7.pdf
    • https://cdn-cms.f-static.net/uploads/4462035/normal_5fa215ee7bd42.pdf
    • https://cdn-cms.f-static.net/uploads/4370052/normal_5f893395d2e53.pdf
    • https://cdn-cms.f-static.net/uploads/4418778/normal_5fadfc1e25c82.pdf
    • https://cdn-cms.f-static.net/uploads/4381536/normal_5f9cdcf476bd5.pdf
    • https://cdn-cms.f-static.net/uploads/4449600/normal_5fa7fbbeed64c.pdf
    • https://pozimetotekiv.weebly.com/uploads/1/3/4/3/134339641/abb051f9083bbc6.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/6085ea31-c627-4ac3-ba45-1774fd362642/76879869507.pdf
    • https://uploads.strikinglycdn.com/files/a7f93ee0-25f4-4098-84de-222c13ab3ae5/wudakuj.pdf
    • https://uploads.strikinglycdn.com/files/64d13baa-2c8e-4430-8c2b-5493b04d435e/iterate_over_characters_in_string_c.pdf
    • https://s3.amazonaws.com/vufuzewasi/26273031858.pdf
    • https://uploads.strikinglycdn.com/files/607d6de8-6fb1-4e94-b93a-47935fa29ff9/waxeninipakixelevewe.pdf
    • https://uploads.strikinglycdn.com/files/62985421-681d-439d-b137-b8d17f81e36c/zewapolodasufit.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_off0000bb0d.bin
f4c6c7372ecc62c772e71e2f631b5c86d740306ad46f6480d1804cd3c66fcf86		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBB0D 4988 bytes
font_01_sfnt_off0000cc22.bin
e34cb9d8a2dc68d36573f7e574b283a2acfa6d58c546401033328c61e26a2e7b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCC22 9776 bytes

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