Malicious PDF — malware analysis report

Static analysis result for SHA-256 d49d81c5a4ec2142…

MALICIOUS

PDF

59.1 KB Created: 2020-11-22 10:27:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 365924a8f206c137e77645214f371196 SHA-1: 6b10b3214deb398580044f1462343dc678073ba3 SHA-256: d49d81c5a4ec2142b8ff01789555bd950884b5838cda543e19e8262af99bc50d
184 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 by multiple heuristics, including a critical alert for linking to known malicious redirector infrastructure. The ML classifier also strongly indicated maliciousness. The embedded links, such as 'https://ggtraff.ru/123?utm_term=westby+high+school', are designed to redirect users to potentially harmful content. While no scripts were explicitly extracted, the PDF structure and embedded links suggest a phishing or redirection attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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 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=westby+high+school In PDF document text
    • https://xagajanum.weebly.com/uploads/1/3/4/5/134599721/9151808.pdfIn PDF document text
    • https://xanodupujariris.weebly.com/uploads/1/3/0/9/130969381/2183787.pdfIn PDF document text
    • https://wiliwakura.weebly.com/uploads/1/3/4/5/134596421/vidagowinikul.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366965/normal_5f88d3fc36d58.pdfIn PDF document text
    • https://bizetuxerupa.weebly.com/uploads/1/3/0/8/130873791/dorin_xujigoxuzut_nagegivemewomod.pdfIn PDF document text
    • https://sikupawabur.weebly.com/uploads/1/3/4/6/134624396/35e2019.pdfIn PDF document text
    • https://rapokivagifo.weebly.com/uploads/1/3/4/3/134338569/431035.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/pomaxa/maths_worksheets_year_8_revision.pdfIn PDF document text
    • https://s3.amazonaws.com/zikeko/gusajaguropogigiku.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a66286a2-7c6e-442c-9819-dd98fe73fad4/bell_lapadula_model_ppt.pdfIn PDF document text
    • https://s3.amazonaws.com/lanorolowu/gamemovasove.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/09f73128-e82c-41dd-a405-21365fc00297/14668888272.pdfIn PDF document text
    • https://s3.amazonaws.com/fasanag/libro_de_aristoteles_y_dante.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_off0000abcf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xABCF 5008 bytes
SHA-256: de5e8b3e7e96dc357f15a351a5f916a4271e1993e5a4b02987e15d5dc257f6b8
font_01_sfnt_off0000bcf8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCF8 9948 bytes
SHA-256: fea649ca93ab4fa5664e68c426c2699796b36d76d774d0fb96843b7a51c8aac5

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