Malicious PDF — malware analysis report

Static analysis result for SHA-256 4691bb9ad229de25…

MALICIOUS

PDF

74.9 KB Created: 2020-11-26 04:18:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 8e3e94ebdd67d35821a6a18d8b699b73 SHA-1: 32bf269575ec9f7c184b1232922fe4c65c0f0276 SHA-256: 4691bb9ad229de25c5d5c7b6bdf480927b75b026161604b9b62407ee7b2041e1
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing or malware distribution lure. The PDF contains a large number of external links, many pointing to PDF files hosted on various platforms, suggesting a link farm or redirection mechanism. While no scripts were explicitly extracted, the PDF structure and the presence of numerous external URIs indicate an attempt to redirect the user to malicious content.

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
  • 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.
  • 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://traffnew.ru/123?utm_term=citrus+hill+high+school+yearbook PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4407102/normal_5fbcf5763c6c4.pdfIn PDF document text
    • https://ruwitopiramowu.weebly.com/uploads/1/3/4/3/134364975/9515921.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387430/normal_5f8cf89bf37c2.pdfIn PDF document text
    • https://bewupoterefi.weebly.com/uploads/1/3/1/3/131380107/vofex-tagifoji.pdfIn PDF document text
    • https://pisanofinupu.weebly.com/uploads/1/3/1/4/131437881/3702811.pdfIn PDF document text
    • https://vuximugividus.weebly.com/uploads/1/3/4/7/134718293/9434457.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383128/normal_5f8dcb6f39a3e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4394062/normal_5fbb8dbcbeb92.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457572/normal_5fa82fffdcc31.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386081/normal_5f9dca2aee033.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419193/normal_5f95ee48b73f0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383308/normal_5f96430f70beb.pdfIn PDF document text
    • http://www.opentle.orgIn 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/777d933c-b8a4-4509-ac4b-917baa46dfe5/archeage_new_player_guide.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://www.gnu.org/licenses/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off0000db57.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xDB57 11080 bytes
SHA-256: 1ab406f325619c75f761ba8b107f356af71de5ec8da2bfd5f499d0a9793a1917
font_00_sfnt_off0000c96d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC96D 5272 bytes
SHA-256: 4ef6fc2ae57ca244b07d1968d2fc454a87fb82171a4a02ace6ae8d6ab3ec7f76
font_02_sfnt_off0000faec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAEC 10512 bytes
SHA-256: f022fa772ef268c8756630bb0568439d1897aaff98a743c0ab238efad0998efc

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