Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a518bd5df8b98e6…

MALICIOUS

PDF

87.7 KB Created: 2021-02-24 18:21:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: d3446c75148c32f76524a57c1750b82e SHA-1: deb75fe7c5f8967b7586c7a091c7b8881b5262f2 SHA-256: 2a518bd5df8b98e60983bfdb9bd93bc82192450cbb26bf14ddac02718ada40fa
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO manipulation tactic. While no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of a phishing or malware distribution attempt.

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
  • 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://leonvi.ru/123?utm_term=the+standard+highline+restaurant+nyc PDF link annotation
    • https://cdn.sqhk.co/nemuvefik/bziagi2/sanitarium_blues_lyrics.pdfIn PDF document text
    • https://cdn.sqhk.co/kapidibewomu/ib2NhaN/98666104895.pdfIn PDF document text
    • https://cdn.sqhk.co/wibafozadil/thanhci/14740243439.pdfIn PDF document text
    • https://cdn.sqhk.co/diwamukef/jLhaHhd/gowodeloxoj.pdfIn PDF document text
    • http://doxisolawasusig.66ghz.com/dark_knight_joker_scenes.pdfIn PDF document text
    • https://tidemipevu.weebly.com/uploads/1/3/0/7/130740592/zuwuxe.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417029/normal_5fe1190f4f4f7.pdfIn PDF document text
    • https://gidixelasulam.weebly.com/uploads/1/3/0/7/130739099/polanibiniluke_sitopitewo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408996/normal_5fd96beddc438.pdfIn PDF document text
    • https://dilukali.weebly.com/uploads/1/3/4/5/134584555/goxivolexibuxe-dufesesefad-zobovuvovew.pdfIn PDF document text
    • https://latapelubatute.weebly.com/uploads/1/3/5/9/135960370/wuposemedorena_wezug_nunewo.pdfIn PDF document text
    • https://javagakikidubat.weebly.com/uploads/1/3/0/9/130969576/wadememi-razud-zogawix.pdfIn PDF document text
    • https://xuxufagitagagi.weebly.com/uploads/1/3/0/7/130740521/tubupaxibipeno.pdfIn PDF document text
    • https://cdn.sqhk.co/woberimi/dnuhigg/instagram_hashtags_for_followers_2020_copy_and_paste.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/jedadokuti/frame_by_frame_animation_in_android_javatpoint.pdfIn PDF document text
    • https://s3.amazonaws.com/resabomibogodaw/information_and_broadcasting_minister_of_kerala.pdfIn PDF document text
    • https://s3.amazonaws.com/tugumeb/zapabosopewekun.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_off000119ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119AE 5252 bytes
SHA-256: 764501ee3faff0c756c20d31f47e6e91e8a0d815a89bd0be124a999902114bde
font_01_sfnt_off00012b8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B8B 11280 bytes
SHA-256: 23b022c957373229f9b9d963fcdbab44e99849baa90cf4b38c432bace0ee1174

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