Malicious PDF — malware analysis report

Static analysis result for SHA-256 4dee23ce3813726e…

MALICIOUS

PDF

65.1 KB Created: 2021-01-21 17:10:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-04-01
MD5: 30964026e3234f276ef4207b0ace5912 SHA-1: 59703c341c7d4afb22ac160119dac8a40f8be5d4 SHA-256: 4dee23ce3813726e955b363d2fc8e0c416c32b095937a86f2031a8d204d301c9
254 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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.
  • 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://yafferge.ru/123?utm_term=another+word+for+good+implications In PDF document text
    • https://site-1168462.mozfiles.com/files/1168462/posibi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368736/normal_5f8ba88eb5336.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413977/normal_5ff06c07839b1.pdfIn PDF document text
    • https://gupapuna.weebly.com/uploads/1/3/4/7/134726568/dusafuti_nugosekuxufif.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408864/normal_5fd15377f2991.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4472783/normal_5fc6480a96d02.pdfIn PDF document text
    • https://tavifarexup.weebly.com/uploads/1/3/4/6/134611028/8157633.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476596/normal_5faaecbf72304.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413712/normal_5fb27e808c314.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403824/normal_5fa754f3c2b9e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4458622/normal_5ff68e6ccdf26.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426954/normal_5ff7b7dcb5477.pdfIn PDF document text
    • https://site-1233605.mozfiles.com/files/1233605/weed_wacker_cordless_amazon.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426953/normal_5fd7b8daa1ba5.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kesekerezox.epizy.com/parofukukatavamabapewu.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c224.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC224 5652 bytes
SHA-256: bf4abf4b16a333b8f13e7ff4c0e605e835448acbd29e960010d64615e5311d76
font_01_sfnt_off0000d546.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD546 10060 bytes
SHA-256: fd1011bc3bf3c240d964225a67df3bf1294035cd5709450f15d490a241159284

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