Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a6211b748a9ac3b…

MALICIOUS

PDF

51.7 KB Created: 2020-11-09 16:14:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-02-02
MD5: 5a83da8f240a77b5895ba84d1495362a SHA-1: b2ffc6b2d686f7a6e7b81066213693fa4e0b0848 SHA-256: 5a6211b748a9ac3b43348d7643445130f008114e9f755535497efd8a155df3cf
194 Risk Score

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.
  • 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://traffking.ru/aws?keyword=best+materia+guide+ffxiv In PDF document text
    • https://cdn-cms.f-static.net/uploads/4408001/normal_5f93a8d3b3947.pdfIn PDF document text
    • https://gixejeti.weebly.com/uploads/1/3/4/3/134326891/9e559.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391602/normal_5f8fef1f92e9c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384035/normal_5fa762e9338d4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365652/normal_5f86f63894510.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383912/normal_5f9198cf767ea.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367624/normal_5f88485a471f9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410730/normal_5f947096548d3.pdfIn PDF document text
    • https://wefamojugibe.weebly.com/uploads/1/3/1/1/131164519/fupad.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476270/normal_5fa8a3f973332.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376611/normal_5f9a2de4d6e47.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415052/normal_5f95ccc8740fc.pdfIn PDF document text
    • https://tunuwowidu.weebly.com/uploads/1/3/4/6/134606858/97e8c4b32.pdfIn PDF document text
    • http://www.ascendercorp.com/In extracted file (font_00_sfnt_off0000892d.bin)
    • http://www.ascendercorp.com/typedesigners.htmlIn extracted file (font_00_sfnt_off0000892d.bin)
    • https://s3.amazonaws.com/mukut/barash_clinical_anesthesia_8th_edition.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 extracted file (font_00_sfnt_off0000892d.bin)

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000892d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x892D 5372 bytes
SHA-256: dfc6172d48531530db817ba60637b41ca2493311b62cd8add81ccc17f54707d9
font_01_sfnt_off00009b68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9B68 11336 bytes
SHA-256: 387cc6fb63bfe9b49b476f2a65cae75a350f62d30f7946ce8aaa0be85784808c