Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8da2939e84ec2ab…

MALICIOUS

PDF

66.5 KB Created: 2020-12-28 11:40:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 46473e83a3a533189c66f2825b2d032f SHA-1: 731a252299501ac5079c17728eea5a17816d2f7e SHA-256: c8da2939e84ec2ab215672654cd8f5317162a75897566a914b9a11755e299e7a
184 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to disposable hosting and a known malicious redirector, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a malicious redirector pattern, likely leveraging JavaScript for execution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://gettraff.ru/123?utm_term=groome+transportation+auburn In PDF document text
    • https://rurizurerenudiw.weebly.com/uploads/1/3/4/6/134649160/daripodisujoserej.pdfIn PDF document text
    • https://jameropavide.weebly.com/uploads/1/3/4/6/134699307/eccf896043.pdfIn PDF document text
    • https://gagezomelebagam.weebly.com/uploads/1/3/1/6/131606069/0fc494c5f6f.pdfIn PDF document text
    • https://gesimuto.weebly.com/uploads/1/3/4/6/134685476/bekewuzuro.pdfIn PDF document text
    • https://cdn.sqhk.co/peluxisomex/4idhazh/spotify_for_artists_before_release_distrokid.pdfIn PDF document text
    • https://cdn.sqhk.co/mofosalamo/VeEUw7k/neon_driving_game.pdfIn PDF document text
    • https://tazifidaron.weebly.com/uploads/1/3/4/9/134901468/0d64bb10bea16.pdfIn PDF document text
    • https://cdn.sqhk.co/jibenapola/RM1hKCo/5655854970.pdfIn PDF document text
    • https://watuboxe.weebly.com/uploads/1/3/4/5/134588214/0df84bbf9.pdfIn PDF document text
    • https://rosofofupamufi.weebly.com/uploads/1/3/4/3/134364257/tuxuwasewupeke.pdfIn PDF document text
    • https://zugufavowi.weebly.com/uploads/1/3/0/8/130874222/3029578.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/7d807f25-f984-4c86-bfa4-f1bc4db46c85/gre_psychology_percentiles.pdfIn PDF document text
    • https://s3.amazonaws.com/wifukedot/banjo_kazooie_rom_espaol_para_android.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_off0000c421.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC421 5104 bytes
SHA-256: 39d356326fe6d0067007744d01855927234779a69f7269737d526c6f7753b228
font_01_sfnt_off0000d55a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD55A 11408 bytes
SHA-256: ff022fc6a9bd1d812e0eee2fefe8e9eda6af3aa99ad5d835b8e93ebbb95b8f23

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