Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f580ebd34145fd0…

MALICIOUS

PDF

49.6 KB Created: 2020-11-05 17:49:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-01-15
MD5: d46d9f0408eabcc7b2fc51ffa455e37c SHA-1: 92b6691142e2dc035972216cc81d67c785cca72e SHA-256: 7f580ebd34145fd051bf8a721faea7cc83767640f2ad07d47da4d5c2f9376713
136 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • 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/aws?keyword=biology+chapter+2+test+the+chemistry+of+life PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4365553/normal_5f8710f700c85.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384644/normal_5f8ca82f3ec2e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390069/normal_5f91591e620a7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424331/normal_5f9bcad792714.pdfIn PDF document text
    • https://wuwenivavubujer.weebly.com/uploads/1/3/1/4/131437756/3056898.pdfIn PDF document text
    • https://javodamujuwevef.weebly.com/uploads/1/3/4/4/134446411/sadiv-lawarilam-ziseni-rekuza.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372983/normal_5f8aa62e7026d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380854/normal_5f8ca3b7375b3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390373/normal_5f93a37364f91.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366007/normal_5f875044c8b52.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421205/normal_5fa165f69ccd2.pdfIn 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/1b5f9def-26cd-433a-8559-f6a9b3bfd00c/rigawurawu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/63e19c5e-96ef-4212-915c-d6d42942315d/minox_35gt_repair.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_off0000671d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x671D 5712 bytes
SHA-256: eb17d17a9032e877a3d2c6fe6079fea723ed4ed5dff8955e038a9e30e6f71f63
font_01_sfnt_off00007a7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7A7A 12800 bytes
SHA-256: 8e1252478ce90f33f6e03e32c67e5d4a8a59ec84f119719269121984993455ff
font_02_sfnt_off0000a43d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA43D 16132 bytes
SHA-256: 43e84046d57c5d8edad47de9228ce36feb53c5e515436c294a71041590f3a3a6