Malicious PDF — malware analysis report

Static analysis result for SHA-256 657763d5337025af…

MALICIOUS

PDF

65.7 KB Created: 2020-12-01 15:47:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: f930971166de40239e15583845ca7144 SHA-1: ae60d02594d3d2844b96f405bd18ffaf80613775 SHA-256: 657763d5337025afe149d0da7acd0f3ffef249d8716d7fa4741a80f17f9ae0fc
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The sample is a PDF document that contains a significant number of embedded links, many of which point to disposable hosting and redirector infrastructure. This suggests a phishing or spam campaign aimed at driving traffic to malicious sites. While no scripts were directly extracted, the PDF format itself can embed JavaScript, and the heuristic firings strongly indicate malicious redirection and link farming activities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://ggtraff.ru/wb?keyword=cavendish%20school%20hemel%20sixth%20form In PDF document text
    • https://jagusidenoz.weebly.com/uploads/1/3/4/9/134902343/8224142.pdfIn PDF document text
    • https://daxugukixirujin.weebly.com/uploads/1/3/4/7/134739014/wakawumukij.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387235/normal_5fa028491586e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376358/normal_5fb77e1c9d09f.pdfIn PDF document text
    • https://nanerofe.weebly.com/uploads/1/3/4/3/134312873/wumesolod.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475564/normal_5fbf7c55da3c0.pdfIn PDF document text
    • https://tavumake.weebly.com/uploads/1/3/2/7/132740551/5117028.pdfIn PDF document text
    • https://nikibowo.weebly.com/uploads/1/3/4/3/134354591/809548.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/106c81d7-cd96-43b7-b76a-011878264849/21607436184.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/46343192-5008-4fdc-b2b0-5dcda3fa98ac/managing_oneself_peter_drucker_full_book.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9c446808-6538-4b69-834f-089deeb2dfd4/39962706012.pdfIn PDF document text
    • https://s3.amazonaws.com/fajeloninesitel/final_fantasy_mods.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc284356609fd0ee79ba959/t/5fc60c273570fb44d1d1f7b6/1606814759616/19169482422.pdfIn PDF document text
    • https://s3.amazonaws.com/zesotat/digarelamifovezobig.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc2e88de2fce462bc991529/t/5fc4692d6457125654c94c6a/1606707504119/94418416727.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_off0000c38f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC38F 5296 bytes
SHA-256: 9283eb8165e634ba0a91adef662aa7cb48139ac2dc41d70e9fac33fdbe4301f9
font_01_sfnt_off0000d56f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD56F 10652 bytes
SHA-256: 738259fbf4cf812ccde91f9dd26f1d70507758e7354fb2a7ed741ce29ce95a3d

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