Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4edf90672946793…

MALICIOUS

PDF

68.5 KB Created: 2020-11-25 12:14:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 223dce1de3e0c28dde35630bca1617a5 SHA-1: 3e2712d9627c7c99043ab9e1ee41e19c21211922 SHA-256: f4edf906729467932dca77a3d91deb5a8e6a1228bb88240b06033d3b662c0950
244 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was flagged as malicious by multiple heuristics and a machine learning classifier, indicating it is likely a phishing or link-farming document. It contains a large number of embedded URLs pointing to various external sites, with at least one identified as a known malicious redirector. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the presence of numerous links suggests an attempt to direct users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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.
  • 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/123?utm_term=schodek+structures+pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4375884/normal_5fa5019f40e45.pdfIn PDF document text
    • https://jajedasas.weebly.com/uploads/1/3/4/2/134234666/rowasubev.pdfIn PDF document text
    • https://losepubi.weebly.com/uploads/1/3/4/5/134502138/parafefejarurat.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387421/normal_5f9fbddfe47fe.pdfIn PDF document text
    • https://fijojonibiw.weebly.com/uploads/1/3/2/6/132681787/8279037.pdfIn PDF document text
    • https://worivoka.weebly.com/uploads/1/3/4/5/134588103/9e1a3dca78d.pdfIn PDF document text
    • https://nonexivibofopuv.weebly.com/uploads/1/3/4/6/134603010/731261.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/bopuxosavubare/robabepari.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a05b0c30-d286-4501-ba00-dd70d3d05f75/power_bi_resume_templates.pdfIn PDF document text
    • https://s3.amazonaws.com/temujonuwu/best_vanilla_sheet_cake_recipe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8338b8cf-4805-455f-b0ae-914ed28f9263/83118853432.pdfIn PDF document text
    • https://s3.amazonaws.com/tiluwisulepam/wogipunidagofagirika.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_off0000cff4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFF4 5168 bytes
SHA-256: 58a5900a3785530e713d06887feeba4278d71de4b059549b0fbcf4403f0f70e9
font_01_sfnt_off0000e189.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE189 10720 bytes
SHA-256: 985176f25c1e00611c667351ea5e99ff494dc37790e6b51691521933e325cfef

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