Malicious PDF — malware analysis report

Static analysis result for SHA-256 acd26b16c52be2bc…

MALICIOUS

PDF

41.3 KB Created: 2020-11-06 19:59:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 450b9aa88a12a6de1386d27bd7b16167 SHA-1: de7144a7e2f25219f6ff944acf8951b8eb7ab3ac SHA-256: acd26b16c52be2bc469bf68f4a143525f62011a360983c797533e0a74350d6b5
134 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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?keyword=emulador+ps2+android+apk+bios+2018 PDF link annotation
    • https://jovikuveditowe.weebly.com/uploads/1/3/0/8/130874612/4907837.pdfIn PDF document text
    • https://rusunesezov.weebly.com/uploads/1/3/4/3/134309606/poveloloz.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/dapekufoxiraku/jupekararanowimup.pdfIn PDF document text
    • https://sufuvuse.files.wordpress.com/2020/11/3074016501.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/900b3513-22c9-49b8-8010-b107353477bd/74406945070.pdfIn PDF document text
    • https://ziruvetod.files.wordpress.com/2020/11/39537039235.pdfIn PDF document text
    • https://zomotinofi.files.wordpress.com/2020/11/88680988383.pdfIn PDF document text
    • https://sisiviweze.files.wordpress.com/2020/11/50939477702.pdfIn PDF document text
    • https://dilopipo.files.wordpress.com/2020/11/demetivudaxakoleze.pdfIn PDF document text
    • https://juvibix.files.wordpress.com/2020/11/wazasusegupaxusijip.pdfIn PDF document text
    • https://lodoxepal.files.wordpress.com/2020/11/vibinofa.pdfIn PDF document text
    • https://nevosaxovib.files.wordpress.com/2020/11/vuvemi.pdfIn PDF document text
    • https://lusabun.files.wordpress.com/2020/11/administracion_financiera_gallagher.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c447ce23-30b2-499b-83ba-11b61d32b006/kikinopadosef.pdfIn PDF document text
    • https://vipuvixo.files.wordpress.com/2020/11/xanomuloxasan.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005eaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5EAF 5784 bytes
SHA-256: 9ad5b21b496e47e3ad055c5049c716d048fa1e940d9fad9fd08cffbb8cea4ade
font_01_sfnt_off0000723e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x723E 10652 bytes
SHA-256: 8bf6fadea4891bfc546364306e991de4e01b52ba5203cae8e02750d40b7f42c5

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