Malicious PDF — malware analysis report

Static analysis result for SHA-256 51b3b1d1d7555713…

MALICIOUS

PDF

59.0 KB Created: 2020-11-02 08:00:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 48c120f5c22b0d61e22b8eb49149f7aa SHA-1: d51661913db734589848de893c0b093da3904382 SHA-256: 51b3b1d1d7555713ab081d5011708e2a5a280e424e70f9317be5076ddd77f009
184 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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?keyword=how+to+learn+pdf In PDF document text
    • https://dutitujazekap.weebly.com/uploads/1/3/0/8/130814390/kadijamiruvinugeno.pdfIn PDF document text
    • https://sizojupitad.weebly.com/uploads/1/3/4/3/134332657/8405544.pdfIn PDF document text
    • https://bibeliki.weebly.com/uploads/1/3/0/7/130738572/pekaberosevaji-navoxojulan.pdfIn PDF document text
    • https://sifizebutu.weebly.com/uploads/1/3/0/8/130814914/6960081.pdfIn PDF document text
    • https://viweposedijul.weebly.com/uploads/1/3/1/0/131070314/wepezuwodu-fivusosi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0505/2298/0536/files/wabifigilofubifeletawemod.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0505/0748/1258/files/al_quran_indonesia_apk_gingerbread.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ac58ef52-a9a4-4302-ad54-fdc83bb7e5f6/67920599584.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0504/1251/9574/files/jerebujud.pdfIn PDF document text
    • https://s3.amazonaws.com/dazutun/feguw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a7b25543-8cfd-4206-8b9c-62ac807e0d32/36232988982.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006b94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6B94 6588 bytes
SHA-256: 44338af2ae2917f5feff7d5e90b8459a7255d5b6c4e9e89c4fa6f30a383634c2
font_01_sfnt_off000081b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x81B4 4908 bytes
SHA-256: 2a5a50e0a2df2984c8be4b6ed9b09c2eb32eaaaeade7c7a6112a36ebb00b5422
font_02_sfnt_off00009280.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9280 1800 bytes
SHA-256: 51ebeec29509b87aa858d500e37ac8853184703d07d1f913ce36d8e1dc7764c0
font_03_sfnt_off00009b0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9B0E 10524 bytes
SHA-256: 68a43a953c892e7380ec5b16f8eeeef21227302ac172c53df987c88f06b7aee1
font_04_sfnt_off0000bf0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF0D 19188 bytes
SHA-256: 6110ff7699302be7c5f66f9fc111e285d330bde98736ac3b193f6243602103f5

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