Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7914c4f34684d63…

MALICIOUS

PDF

69.3 KB Created: 2020-11-16 12:47:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 9765eec4c2d80067862380b195996b61 SHA-1: de4826ddcc8baa0bcb86ae80bb40049d6c6abda7 SHA-256: d7914c4f34684d63dcdc866f61039e2f80622931ea39ca4a9365260bbb3bc173
214 Risk Score
Tags
free-cdn-ebook-manual-lure

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 for phishing or to serve a secondary payload. No scripts were extracted, but the PDF structure itself facilitates the attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://cctraff.ru/123?utm_term=nile+c.+kinnick+high+school In PDF document text
    • https://faluwizux.weebly.com/uploads/1/3/4/3/134372305/defegu-zusisam-sivax.pdfIn PDF document text
    • https://xoraxabaxid.weebly.com/uploads/1/3/2/6/132682630/kivutagawalapu_vadejug.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/e3847b47-af27-4015-8d31-1c4e81d70762/33997375035.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/07d11dd0-d27d-4416-b039-8c4d78542bee/fosafefugixifivezid.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/13addc9d-3d2a-40d2-b73c-ce283b4158e1/jitex.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4211c8a5-ff85-4713-8775-3673f0f78fbd/pufajewevos.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6fba535f-38e6-440e-9715-c35af7cb6b7b/22870893468.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/af281430-8439-4fcd-b816-7c79deff3e60/77585234983.pdfIn PDF document text
    • https://s3.amazonaws.com/pexodugosa/wisotuvonomuvovitip.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1f43d877-5c46-4e49-9d3c-b67e4eaa3fac/12039795210.pdfIn PDF document text
    • https://s3.amazonaws.com/degagaziv/58623222413.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c86b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC86B 4528 bytes
SHA-256: 2e22c222340db684355f2eb5a92ce1fdd61360c872ad727c8ca4a788c613cb8e
font_01_sfnt_off0000d7c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7C4 10192 bytes
SHA-256: dcb1eff939304a44db3b6e31ccea4f1dc8aba03bcc2c1f5a73d3757af8cb2609
font_02_sfnt_off0000fa9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA9E 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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