Malicious PDF — malware analysis report

Static analysis result for SHA-256 41a542b4215abc96…

MALICIOUS

PDF

75.8 KB Created: 2021-03-01 10:30:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: aadecc5f4d10b637cdeb561df337d26e SHA-1: d70179cdf8d82fed8e01be649e445313398de5b7 SHA-256: 41a542b4215abc9606591ab05b5a6bb2cd3fd646a1c970bf9dcd2170f4b8cfb7
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://jacksth.ru/strik?utm_term=administracion+de+medicamentos+por+via+otica+objetivos PDF link annotation
    • https://letosuve.weebly.com/uploads/1/3/0/7/130739520/c390f200.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448550/normal_5fd813ce14bc4.pdfIn PDF document text
    • https://gavebinakufir.weebly.com/uploads/1/3/2/3/132302735/613323.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465719/normal_6028a39c3bf6d.pdfIn PDF document text
    • http://rexonina.medianewsonline.com/what_are_the_ethical_questions_raised_by_cloning.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470678/normal_601ce8aca2d14.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490735/normal_600c8ed35e35f.pdfIn PDF document text
    • https://ganakinupep.weebly.com/uploads/1/3/4/5/134599301/5d364eacfe626cd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487432/normal_601889df8bbfa.pdfIn PDF document text
    • http://pewadulojuba.mypressonline.com/41077942654.pdfIn PDF document text
    • https://zokelafeg.weebly.com/uploads/1/3/4/8/134889419/1167074.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/nazekisigiduz/departmental_contribution_to_overhead_reports.pdfIn PDF document text
    • https://s3.amazonaws.com/divikufifir/79027413440.pdfIn PDF document text
    • https://s3.amazonaws.com/bipepezuwed/baby_pink_platform_heels_uk.pdfIn PDF document text
    • http://wegugoleta.onlinewebshop.net/25742032953.pdfIn PDF document text
    • http://bidusibebawuz.onlinewebshop.net/51648020505.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dadd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDADD 5240 bytes
SHA-256: d3df95cb95210f738284bec6f6176214bb4240c30d9cdd7c163cd22040aa94b8
font_01_sfnt_off0000ec89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC89 11476 bytes
SHA-256: ca6d97606c4ae540f508d898737b6feea96200baf1a38435c9e654c166728074
font_02_sfnt_off000111af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111AF 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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