Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6a503dd69562c62…

MALICIOUS

PDF

75.5 KB Created: 2020-12-28 07:42:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 237cc01e4bd934b9e8b47658a3b8ed98 SHA-1: 90b942ff28d72ca3727303ceb4e4760c61dd0b4e SHA-256: d6a503dd69562c62a58ef0dfb4111d8040c47096d3e8d5460b6104eabc50b266
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains a large number of external links, many of which are to PDF files, suggesting a link farm or phishing attempt. The ClamAV detection and ML classifier strongly indicate maliciousness, specifically as a phishing or trojan delivery mechanism. While no scripts were explicitly extracted, the presence of numerous external URLs and the 'PDF_SEO_LINK_FARM' heuristic indicate the document's primary purpose is to redirect users to potentially malicious sites, likely for credential harvesting or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://traffset.ru/123?utm_term=aquarium+visit+worksheet PDF link annotation
    • https://datirelegewewat.weebly.com/uploads/1/3/4/3/134329883/ninir-puduvesawitef.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392191/normal_5fa30cdeeac58.pdfIn PDF document text
    • https://lazumuron.weebly.com/uploads/1/3/4/8/134863931/1299864.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381094/normal_5fbf6a163ce54.pdfIn PDF document text
    • https://zamidagotef.weebly.com/uploads/1/3/1/4/131453459/ludazefewevated.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453741/normal_5fb03374f33ef.pdfIn PDF document text
    • https://cdn.sqhk.co/lapefuxolu/LMuhdhj/music_maker_hip_hop_beat_producer_download.pdfIn PDF document text
    • https://vodipewelo.weebly.com/uploads/1/3/1/6/131637384/2992456.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417808/normal_5fdbfceb77f72.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/zunewidimem/google_chrome_65_filehippo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/51ba76e7-7b87-4a2f-b23c-40541e7af70d/guxowovuxu.pdfIn PDF document text
    • https://s3.amazonaws.com/wipotegadodorek/crossword_answer_for_distinguished_or_famous.pdfIn PDF document text
    • https://s3.amazonaws.com/daselex/vomawagiv.pdfIn PDF document text
    • https://s3.amazonaws.com/fobupojowojon/alloxan_monohydrate.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d42e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD42E 5224 bytes
SHA-256: f4d181c5145e707bf8beccaaf33119092b8aa00e705c90d316b2b55f3405ea2f
font_01_sfnt_off0000e5e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5E3 10444 bytes
SHA-256: 35f5de771c37511296a1059abec6860ee7157fcc698993fa29da56c978b44299
font_02_sfnt_off000109ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109EA 16140 bytes
SHA-256: 2732c78df68b4531e26da51a256f0f9ab881cb8a96d1886ade34872d88eeece3

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