Malicious PDF — malware analysis report

Static analysis result for SHA-256 840dbe13856f66c9…

MALICIOUS

PDF

65.5 KB Created: 2021-02-15 18:26:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 48ea84b5aa4eaf62d87a225ddf6af864 SHA-1: 1bb8218f3d29f100d238e699b8fa2d8fb6470a4f SHA-256: 840dbe13856f66c9421853c91ce1f595a2b35168a5c54a7079cbd83d018ad864
184 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://yafferge.ru/wix?keyword=mbi+setl+med-i-bank+med-i-bank+gusto In PDF document text
    • http://nunanokipikade.22web.org/mewudokimifogek.pdfIn PDF document text
    • http://waramejejit.22web.org/new_bollywood_movies_mp4_free.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412895/normal_5fe1d8afc0f51.pdfIn PDF document text
    • http://milky-rp.space/19675561689a9ma.pdfIn PDF document text
    • https://cdn.sqhk.co/wamiratena/hfhaLlo/lufusedupabozegabimuxijef.pdfIn PDF document text
    • http://artdebug.site/52737972297rzoml.pdfIn PDF document text
    • https://cdn.sqhk.co/javukapegami/hjMtChv/34992920053.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4457838/normal_5fec869269a91.pdfIn PDF document text
    • https://cdn.sqhk.co/kafufojugure/a7jhHih/36651999470.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375341/normal_5fe8f5c59fd7b.pdfIn PDF document text
    • https://cdn.sqhk.co/xajamenujo/ig4hdib/tenkyu_ball_balancing_game.pdfIn PDF document text
    • http://copyright-help-center.com/absage_einladung_formulieren7zwd7.pdfIn PDF document text
    • https://cdn.sqhk.co/jimumakevaji/AgdrZjf/kulabadam.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/laginekux/philips_tv_ambilight_manual.pdfIn PDF document text
    • http://bepenaguvofiw.epizy.com/meboduvutezuror.pdfIn PDF document text
    • http://buwebone.epizy.com/jumipubofunovasojufonadij.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b68d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB68D 5172 bytes
SHA-256: d5ab57c781b6c839960a0c9894283ca601b06ba602f76c5225b84df5cc88175e
font_01_sfnt_off0000c813.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC813 10088 bytes
SHA-256: e4e7736ca86fdc56a53ed680fecc1b1bb9168b27d15bdb9ee1deeefa11b3a3cc
font_02_sfnt_off0000eaa9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAA9 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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