Malicious PDF — malware analysis report

Static analysis result for SHA-256 12f3b1bfcc705112…

MALICIOUS

PDF

80.2 KB Created: 2021-05-22 20:44:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 5a022355803c809233eff100ea298762 SHA-1: 5442e2bb8f63ba86df96c3f4461636c1d184ed56 SHA-256: 12f3b1bfcc705112f5bd2599d4a2b100ebeb48d059e18ba0f96b610eb8e967ff
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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://botokaw.ru/strik?utm_term=scary+stories+to+tell+in+the+dark+stories+2 PDF link annotation
    • https://boginajidu.weebly.com/uploads/1/3/4/6/134693166/5354639.pdfIn PDF document text
    • https://xafokakiza.weebly.com/uploads/1/3/2/7/132710638/levumetuvozu_guveketidufat_melurunuzaz.pdfIn PDF document text
    • https://buxodofuluni.weebly.com/uploads/1/3/4/8/134875319/1206708.pdfIn PDF document text
    • https://tidemipevu.weebly.com/uploads/1/3/0/7/130740592/cef53466.pdfIn PDF document text
    • https://mevuzujalojidid.weebly.com/uploads/1/3/4/5/134598641/3609794.pdfIn PDF document text
    • https://dovizitozul.weebly.com/uploads/1/3/1/4/131408131/mewut.pdfIn PDF document text
    • https://sifobidegi.weebly.com/uploads/1/3/0/8/130874382/8610838.pdfIn PDF document text
    • https://vonazevuza.weebly.com/uploads/1/3/4/6/134603973/6199821.pdfIn PDF document text
    • https://vevavosabiwebe.weebly.com/uploads/1/3/4/3/134349804/c995361.pdfIn PDF document text
    • https://kuvitarige.weebly.com/uploads/1/3/4/0/134095916/272510.pdfIn PDF document text
    • https://sozefusezat.weebly.com/uploads/1/3/4/8/134860931/5323487.pdfIn PDF document text
    • https://kexowepapu.weebly.com/uploads/1/3/2/8/132815076/9601673.pdfIn PDF document text
    • https://dinomorozowi.weebly.com/uploads/1/3/4/6/134610364/dupuvidiboberebafe.pdfIn PDF document text
    • https://wipikiriku.weebly.com/uploads/1/3/4/6/134696444/fac1b9ad492.pdfIn PDF document text
    • https://wikefazopikevi.weebly.com/uploads/1/3/4/7/134715570/3903001.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/34c2d034-7d92-4b22-bad0-e2cbcea227ea/43113175894.pdfIn PDF document text
    • https://s3.amazonaws.com/nefagolom/pipevixatixinebigikogelig.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3d157b9c-a8a0-40bc-8153-fae09d728d3d/why_school_uniforms_should_be_banned.pdfIn PDF document text
    • https://s3.amazonaws.com/bulozor/caida_libre_ejercicios.pdfIn PDF document text
    • https://s3.amazonaws.com/setigafat/10958002190.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_off0000f6bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6BB 5428 bytes
SHA-256: dca7d3a97766f88d46f25f6f5f77f5de60a68d08cb4e17448699ed7d44cb5e89
font_01_sfnt_off0001092f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1092F 12112 bytes
SHA-256: 3cb2b1c1d4be2af49997840aa356ac4af2505b314b27313de15a8ec2c8d9bf22

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