Malicious PDF — malware analysis report

Static analysis result for SHA-256 41034bff7ebde26c…

MALICIOUS

PDF

75.5 KB Created: 2021-06-04 23:52:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 57f0a4b423ddd7c92f41da53ef1d29de SHA-1: 550898d4a94938d4bdafbcedeabcfb63fc49c6d3 SHA-256: 41034bff7ebde26cd6d5d84bb6da797d353d5728f5eeb51e04c913ec2a6edf00
186 Risk Score

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 0.9993

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://lozipotod.ru/123?utm_term=fannie+mae+guidelines+regarding+disability+income PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4465719/normal_605f6d2965c8e.pdfIn PDF document text
    • https://wufezaju.weebly.com/uploads/1/3/0/7/130738917/db9d8e7b.pdfIn PDF document text
    • https://tuloforukidape.weebly.com/uploads/1/3/4/7/134752744/xatapuw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447085/normal_5fe759150c6a2.pdfIn PDF document text
    • https://lapumutugafi.weebly.com/uploads/1/3/4/6/134601317/worenosufiku-dulanepobo-zoxada.pdfIn PDF document text
    • https://pizovepe.weebly.com/uploads/1/3/5/3/135323062/65e04dfdeb3aa4.pdfIn PDF document text
    • https://metaxifal.weebly.com/uploads/1/3/4/3/134311681/ec203584ed4.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4465131/normal_60b7385c29342.pdfIn PDF document text
    • https://vudefuzafovafid.weebly.com/uploads/1/3/4/6/134630521/rapariwos_vemizamanalode_fugugover_polesiki.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414494/normal_60541eb290255.pdfIn PDF document text
    • https://vatewiwep.weebly.com/uploads/1/3/4/4/134482367/7255098.pdfIn PDF document text
    • https://pobikutilun.weebly.com/uploads/1/3/4/8/134871216/vovupopakuzaxoz_gabakik_zusurumiwaw.pdfIn PDF document text
    • https://fadejumiz.weebly.com/uploads/1/3/5/3/135349507/ab89d15f633521f.pdfIn PDF document text
    • https://xopaluwejur.weebly.com/uploads/1/3/1/8/131857284/varoxovuzudurezaxe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369769/normal_603115d530f69.pdfIn PDF document text
    • https://larebefol.weebly.com/uploads/1/3/4/6/134691273/kemalovogemoxut_rujaloludufo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377403/normal_601b446885dd7.pdfIn PDF document text
    • https://didowivukosu.weebly.com/uploads/1/3/4/4/134470318/ae3154485854339.pdfIn PDF document text
    • https://rereviraret.weebly.com/uploads/1/3/4/5/134512362/c6a6315.pdfIn PDF document text
    • https://jovegubegatok.weebly.com/uploads/1/3/5/3/135318826/2fee9945.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kepojijudiva.pbworks.com/w/file/fetch/144527217/muwuvumobapagesigoruzowaw.pdfIn PDF document text
    • http://jesababa.pbworks.com/f/57051225860.pdfIn PDF document text
    • http://dumogaluz.pbworks.com/w/file/fetch/144575244/65471703350.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_off0000e81a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE81A 5456 bytes
SHA-256: 5675bf2db3cadc137f5e5edc536f6ef86dc576e6af204fcc7318f54587f794ac
font_01_sfnt_off0000fa9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA9D 11264 bytes
SHA-256: 6caf6b8e033670d66b96363cd1dc2b4a350b0d3a39d5b13d4c5db8a0dce30211