Malicious PDF — malware analysis report

Static analysis result for SHA-256 184cbeda0280aa35…

MALICIOUS

PDF

73.8 KB Created: 2021-01-10 12:46:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 3ed24c0db0357f1fb16145b5a2e8b52e SHA-1: 9826cfd78ba63467e09340d29ff51870c1a7051f SHA-256: 184cbeda0280aa3585e0a9c2bead1417617792b5f18de01dc0f5629d0110bf31
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a large number of external links, many of which point to disposable hosting services, indicating a link farm or SEO spam operation. The ML classifier strongly flagged this PDF as malicious. The document body, though heavily obfuscated, suggests a lure related to a 'character sheet'.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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?utm_term=morepurplemorebetter%2527s+auto-fillable+character+sheet PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4496391/normal_5fbbc226db9f6.pdfIn PDF document text
    • https://site-1206985.mozfiles.com/files/1206985/2429088851.pdfIn PDF document text
    • https://site-1177443.mozfiles.com/files/1177443/kits_dream_league_soccer_2019_juventus_champions.pdfIn PDF document text
    • https://cdn.sqhk.co/kezavilageg/ha4fIjh/go_compiler_escape_analysis.pdfIn PDF document text
    • https://zororoxuz.weebly.com/uploads/1/3/4/3/134309160/wirejuwewurewi.pdfIn PDF document text
    • https://kizekusoviwo.weebly.com/uploads/1/3/1/4/131453028/95010c4d.pdfIn PDF document text
    • https://cdn.sqhk.co/baluwofuk/bVhejd7/30659200790.pdfIn PDF document text
    • https://tesokumerapaj.weebly.com/uploads/1/3/4/5/134522001/7cbad.pdfIn PDF document text
    • https://nuvefiwepopowu.weebly.com/uploads/1/3/4/5/134502743/weter-dedeku-dodafiwatovosi.pdfIn PDF document text
    • https://wamibujobaju.weebly.com/uploads/1/3/4/7/134716207/1149528.pdfIn PDF document text
    • https://site-1171850.mozfiles.com/files/1171850/3718922632.pdfIn PDF document text
    • https://site-1166708.mozfiles.com/files/1166708/mix_video_player_app.pdfIn PDF document text
    • https://site-1175494.mozfiles.com/files/1175494/bevars_naa_songs_dj.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000e2dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2DC 5468 bytes
SHA-256: 85062840133ae737965d8a2261006a1fe7be28fe8cfa16e125c12c8ae60f2bea
font_01_sfnt_off0000f559.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF559 10708 bytes
SHA-256: 026f32cb002753776a48333978dbb0fc59699ee89f7d483963add648a3ea758d

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