Malicious PDF — malware analysis report

Static analysis result for SHA-256 140a7476bbb026f5…

MALICIOUS

PDF

79.7 KB Created: 2021-03-19 02:32:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 4910cdd7177ab1b6be1f0660f7c24385 SHA-1: 1387db51cf9f93cbcb9fcc94658eb93c86bf6362 SHA-256: 140a7476bbb026f5dd991ae8cda99d72faadb680facbcbc82152689fb815fdb8
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://bologen.ru/wix?keyword=confluence+christian+high+school PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4366018/normal_604f99834e869.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487423/normal_603e8f9ee1d45.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374708/normal_6007fccc5ca00.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475588/normal_60297662e8cde.pdfIn PDF document text
    • http://gidaxajigim.22web.org/27962104768.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470985/normal_603e281f55501.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/samopakamefap/wogaweketul.pdfIn PDF document text
    • https://65de77fc-0341-4fd2-89b2-cd6b005a91de.filesusr.com/ugd/cf79db_3554591149914108a9d47f8647592fcb.pdf?index=trueIn PDF document text
    • https://a43ab9c2-5efb-4cee-ac06-b782a0f5e207.filesusr.com/ugd/4826f5_bb079df93911479990b38f28ab00a049.pdf?index=trueIn PDF document text
    • https://b32521b7-32ca-447e-9967-d27d0dce683d.filesusr.com/ugd/800b88_6f88848ae100461f8fb6d3ee80be5730.pdf?index=trueIn PDF document text
    • https://34ec465e-51aa-4dba-9a8c-c05fcfb5ae84.filesusr.com/ugd/df15ee_c90ab1780a65487b9506009b875f930d.pdf?index=trueIn PDF document text
    • https://91ca87c2-c493-4616-adaa-fbcec45394e1.filesusr.com/ugd/6116da_5524e459560b4c84a52630a88223f055.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xupizewuxere/bamowisereguz.pdfIn PDF document text
    • https://09235f31-469a-4613-94fc-36d04c1f642a.filesusr.com/ugd/8b6407_978b102fef8242119fc8f48676562c63.pdf?index=trueIn PDF document text
    • https://38f9ccf9-db33-4582-994d-0ea518e52d38.filesusr.com/ugd/368de4_d3306f9ae3d74e81a3f93528de0338cd.pdf?index=trueIn PDF document text
    • https://2e03c77f-99cc-4591-9807-54d8d49c9ce6.filesusr.com/ugd/759733_f98ec3bb8343478497f91eaa4cb75192.pdf?index=trueIn PDF document text
    • http://vitusaw.rf.gd/70463759021.pdfIn PDF document text
    • https://33fe1336-4051-433c-b691-b763732126dd.filesusr.com/ugd/6c8f37_8eba142738824eac8386e8ee7aabe1ca.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xafaxotaful/revejutalewekewiboja.pdfIn PDF document text
    • https://3ae4d138-4ba3-4962-98fb-1b98b40a6a82.filesusr.com/ugd/38062a_2eefdc32ff16428e8bbebfc5849d390d.pdf?index=trueIn 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_off0000f767.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF767 5048 bytes
SHA-256: f3b6ed434051a45c5d557e864dd1e7cbeefffc9f3add988ed085b56ffaed76d7
font_01_sfnt_off00010890.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10890 11568 bytes
SHA-256: db7387df973719729658f24a0c7f7abb73b9565caf30eac91705c11d7748e557