Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5423d3c98f0f3e6…

MALICIOUS

PDF

49.2 KB Created: 2020-10-02 04:58:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: e18143f7acb515d9becb56c9934c5357 SHA-1: 3637cc14e782e7e3bf4f74ffa1615e139a5c0a07 SHA-256: e5423d3c98f0f3e6c9211e613e78143f4ece782e030e3c147880d7e5ae10d826
202 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • 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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://gettraff.ru/strik?keyword=begf+101+question+paper+december+2020+pdf In PDF document text
    • https://site-1038597.mozfiles.com/files/1038597/79475970816.pdfIn PDF document text
    • https://site-1036698.mozfiles.com/files/1036698/fubiwizufere.pdfIn PDF document text
    • https://site-1038705.mozfiles.com/files/1038705/79006221537.pdfIn PDF document text
    • https://site-1038313.mozfiles.com/files/1038313/31980720858.pdfIn PDF document text
    • http://files.kpuhra.com/uploads/1/3/0/7/130738513/tojuteza-rekale-fojoniba.pdfIn PDF document text
    • http://motifaxe.mightypineacres.com/uploads/1/3/0/8/130873786/3565280.pdfIn PDF document text
    • http://newazujev.billings-equestrian.com/uploads/1/3/0/7/130775387/6b97f86cd.pdfIn PDF document text
    • http://bubar.africanqueensdance.com/uploads/1/3/2/8/132815004/8317544.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/2344/9760/files/galizamimexat.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0485/9084/8165/files/mefawopopajukomiwajofefov.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/5139/2922/files/tegimejesirizosisuru.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0498/0604/9434/files/diamond_fork_hot_springs__springville_utah.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0479/1608/9510/files/28271304219.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0486/0719/9400/files/686_amibios_1999_motherboard_drivers_windows_7.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_off00006528.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6528 6084 bytes
SHA-256: ef9f37f7bfec92b2fc78b262db3a4bd59a80a02b74fae23b9f0b5722afbc9583
font_01_sfnt_off000079c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x79C8 13948 bytes
SHA-256: b3a9a1e937327bde3e6461485d9e1c86d2d3c7c07571a5c642a5d1d6f3eda5e7
font_02_sfnt_off0000a602.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA602 4628 bytes
SHA-256: e9c40fd071f69d2366f502889e282b71dbfa6ef01ce4a8302bab1e7751a53f50

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