Malicious PDF — malware analysis report

Static analysis result for SHA-256 4529a462c22625c8…

MALICIOUS

PDF

67.1 KB Created: 2021-03-25 14:13:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 885b712f9bb06b0bf9d9c3ca93b3e8b5 SHA-1: 6043c454e57b59324cb9b01d9f52d19c5ad0e931 SHA-256: 4529a462c22625c89c4329f07da5fecc95d482116e8a8f6be9c5fe645eac8fb2
186 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 ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://midufefew.ru/award?keyword=materiales+dentales+aplicaciones+clinicas+pdf PDF link annotation
    • https://tatudikugox.weebly.com/uploads/1/3/4/7/134738012/xefizoxefusufit.pdfIn PDF document text
    • https://cdn.sqhk.co/fiwojosop/2Dia2Ab/red_rose_pizza_cincinnati.pdfIn PDF document text
    • https://faboduvo.weebly.com/uploads/1/3/5/3/135343103/vonudawifilo.pdfIn PDF document text
    • https://cdn.sqhk.co/dorejewibiz/haZHBu1/adventures_of_tom_sawyer_movie_1973.pdfIn PDF document text
    • http://the-english-temple.com/vr_buck_hunterfsts5.pdfIn PDF document text
    • http://znasila.ru/656735732360px28.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4418755/normal_5fcd2dcf4ebdc.pdfIn PDF document text
    • http://lnstagramverifiedbadge-media.com/lemurijusentvoun.pdfIn PDF document text
    • https://dipakexamima.weebly.com/uploads/1/3/1/0/131069759/1952806.pdfIn PDF document text
    • http://shoop-fn.ru/deresemelavozujeseruguf9yvjs.pdfIn PDF document text
    • https://zusavakaki.weebly.com/uploads/1/3/0/8/130815140/3f93a67b2c0a6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454813/normal_603098915a74e.pdfIn PDF document text
    • https://xoxomupufolud.weebly.com/uploads/1/3/0/9/130969418/47048a3e0b.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/zewimu/champion_manager_17_mod_apk.pdfIn PDF document text
    • https://ff19a39e-637c-4fc6-80cc-750024e8dd37.filesusr.com/ugd/d217e2_44aadb15ebff432d8e5f3b79fd553139.pdf?index=trueIn PDF document text
    • https://0f926834-650c-4d5a-b53c-ad60ae412ccc.filesusr.com/ugd/6a44d8_5a07964bac2e47ebbc4d5262db19f055.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fewifuwu/33988668219.pdfIn PDF document text
    • https://eed7fa7e-4f31-4ba6-8269-e73f07ac74c5.filesusr.com/ugd/93374d_be5f3053fa4247379fa68e599f82a951.pdf?index=trueIn 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_off0000ca2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA2E 5156 bytes
SHA-256: 4eebaeceaf5603d7d2b0f23aa1d8f7f85875de6f29607544c5cf1947db1535c3
font_01_sfnt_off0000dbd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBD2 10768 bytes
SHA-256: c4327282c81366413917a7ffaaff96fe11a1bfe2ef71d7969aeb974127649966

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