Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e8910d28bbfc95d…

MALICIOUS

PDF

77.2 KB Created: 2021-05-23 04:44:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 2a1393b256760a64f090f1cc0abef44e SHA-1: b38259fb6968d90471d15333ba06037446f5045a SHA-256: 8e8910d28bbfc95dbb28f7130f65ea45100f375a2826467ef4b1bc047539df30
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://dafemum.ru/strik?utm_term=sin+senos+si+hay+paraiso+2+temporada+-+capitulo+53+hd PDF link annotation
    • https://saduzuwaz.weebly.com/uploads/1/3/4/5/134599146/8afea56fa1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451225/normal_5fe3a91523518.pdfIn PDF document text
    • https://mifugitosa.weebly.com/uploads/1/3/4/6/134631290/neveget_toxesejupa.pdfIn PDF document text
    • https://nitatodija.weebly.com/uploads/1/3/4/0/134012345/sokunovesifovo.pdfIn PDF document text
    • https://xuvibelatubeni.weebly.com/uploads/1/3/5/3/135306186/96d36.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406777/normal_606e7b17efd44.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425926/normal_602e21ac43b7c.pdfIn PDF document text
    • https://runumoviw.weebly.com/uploads/1/3/4/8/134854062/niwomat.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383680/normal_600dc99e152bb.pdfIn PDF document text
    • https://debuvubuni.weebly.com/uploads/1/3/4/8/134846467/4549104.pdfIn PDF document text
    • https://fuvenaxumegiga.weebly.com/uploads/1/3/3/9/133999500/357164.pdfIn PDF document text
    • https://vikenefimedok.weebly.com/uploads/1/3/4/3/134390201/jisojuzagijoziv.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/senodiw/zalakokoru.pdfIn PDF document text
    • https://s3.amazonaws.com/kibavutibeved/persuasive_essay_brainstorming_worksheet_gcu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6a3e5e9a-571c-4a33-81b7-b4cb6a71d383/how_to_do_a_buttonhole_on_a_brother_sewing_machine.pdfIn PDF document text
    • https://s3.amazonaws.com/baxekojojexusol/salilufupazu.pdfIn PDF document text
    • https://s3.amazonaws.com/mogipegi/79336118364.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/375bc599-80a7-4cff-ac60-0e3be6af3110/90015200544.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3102397a-2e62-4467-b3d8-d684e7dcd994/dugikozav.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d57b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD57B 5972 bytes
SHA-256: 7faa028e5c473637b5fbdc765db24b83ff391b1bdffeb70cca9a9a2c989c00f7
font_01_sfnt_off0000e9b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9B6 11652 bytes
SHA-256: 6e851feabf9b0b7a627ed7dc6753a4659990a1c01cac73cbd2a96c0f61112937
font_02_sfnt_off00010fdd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FDD 16256 bytes
SHA-256: 1d7d36ff445393fc65c0d4b420ca55ab1026fc76eebc0d03c57d4366b6279123

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