Malicious PDF — malware analysis report

Static analysis result for SHA-256 51576a510ea946eb…

MALICIOUS

PDF

39.2 KB Created: 2020-11-05 20:18:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-01-23
MD5: cc5e44067c19f967307e8eb858a72e5d SHA-1: 81f9cd58f964ffc6a885eb4ec2f5cb68fcdf110f SHA-256: 51576a510ea946ebe081a5677af275d4ce4af4a815f541078518185150d9f8a0
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://traffking.ru/123?keyword=manual+for+stihl+50+bg In PDF document text
    • https://cdn-cms.f-static.net/uploads/4369327/normal_5f88af19de7b3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375203/normal_5f925d5b21a3d.pdfIn PDF document text
    • https://xodetawutal.weebly.com/uploads/1/3/0/7/130774968/c0531f4a.pdfIn PDF document text
    • https://guwomenod.weebly.com/uploads/1/3/0/8/130873843/ligewajinaxi.pdfIn PDF document text
    • https://roriwemako.weebly.com/uploads/1/3/4/5/134599113/gixikam-pamaj-wipibawijenepar.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376870/normal_5f9765f93dc9c.pdfIn PDF document text
    • https://zemuxarasojutin.weebly.com/uploads/1/3/4/3/134374283/a7dc4e67da7bfe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427105/normal_5fa0af3475f54.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387924/normal_5f99093f78b2a.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://uploads.strikinglycdn.com/files/2462b85b-0942-429b-9646-717a6d3870a0/robudezagovemore.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/554a7c9a-3d99-4e45-a919-f024c53c98da/83370376312.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5290ca9e-48f5-4b2b-b9f2-bed721f2b902/ffx_fortune_sphere_farming.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_off00005121.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5121 5440 bytes
SHA-256: bdfb4bbc2c9d624ac1e4460e2846b71c4332d5f76ae2da1878bcf0fb0a10e426
font_01_sfnt_off000063a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x63A9 1612 bytes
SHA-256: ef1d8bdc1257846726cc0d355806cf6e6bc9d766f4defd18fb431c62ce94704b
font_02_sfnt_off00006c34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6C34 10500 bytes
SHA-256: 42453ac32d1bcb729844df9c682c7fdb961217b8d9aba6640a77ad771e22fa8c

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