Malicious PDF — malware analysis report

Static analysis result for SHA-256 030ba0e13a4ab168…

MALICIOUS

PDF

74.7 KB Created: 2021-04-06 19:10:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: fe40515a27d4160487e78e7f65ca8093 SHA-1: 9f8b4a04b0a26ec589cacf1bb57ef591981dfb75 SHA-256: 030ba0e13a4ab1682d9899924df8130611fec5746050e192b6685102c757c0d5
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 0.9998

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://xajibur.ru/strik?utm_term=how+to+see+old+google+search+history PDF link annotation
    • https://zeloruzo.weebly.com/uploads/1/3/5/3/135349371/xefotinotusuwex-menofepe-zizulumefebod.pdfIn PDF document text
    • https://pazopoxe.weebly.com/uploads/1/3/5/2/135293382/rimutodelij.pdfIn PDF document text
    • https://bigonokefexix.weebly.com/uploads/1/3/4/5/134518339/2500979.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425005/normal_60536489197af.pdfIn PDF document text
    • https://toruvorunivigu.weebly.com/uploads/1/3/5/3/135317855/4641834.pdfIn PDF document text
    • https://xorizelipuv.weebly.com/uploads/1/3/1/6/131637744/nudukonejagu.pdfIn PDF document text
    • https://woduluzotuni.weebly.com/uploads/1/3/4/3/134373450/9221436.pdfIn PDF document text
    • https://visunudit.weebly.com/uploads/1/3/1/4/131483005/5708558.pdfIn PDF document text
    • https://fepaxumezo.weebly.com/uploads/1/3/4/3/134320712/9939324.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425005/normal_606449e392c1e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393033/normal_6044221d75092.pdfIn PDF document text
    • http://rumukisizupew.iblogger.org/befefodugilukepij.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nowuzapifara.rf.gd/1080553925.pdfIn PDF document text
    • http://pakapenabu.atwebpages.com/cellule_animale_et_vgtale_exercice.pdfIn PDF document text
    • http://kiralemosokeze.epizy.com/71809234608.pdfIn PDF document text
    • http://nuvafakidem.rf.gd/edit_file_to_word_document.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_off0000e5d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5D1 5356 bytes
SHA-256: 6c10d59d635dfd41fdd95c8fd47dad674d4b3d719ccb7ab077a865e64dedd8d3
font_01_sfnt_off0000f815.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF815 10988 bytes
SHA-256: e4089ae593129db1811c29beed1a63ebb9f7dafddb72b485d5a313ae40fda69d