Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef452134c5e3d553…

MALICIOUS

PDF

88.8 KB Created: 2021-03-14 01:44:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5f8f89c492e91f5da143f59c6160a940 SHA-1: 14c605a97c0781dc558c8065cb1dea215c9ec994 SHA-256: ef452134c5e3d55360cbe1a72aadccc90066b5fcefaea9e72f1c8ce9f2e3ff19
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of external links, many of which are part of a link farm designed to manipulate search engine results. The primary malicious URL identified is 'https://xezojetit.ru/wix?keyword=bernard+of+clairvaux+sermons+on+the+song+of+songs+summary', which is likely used to redirect users to phishing or malware sites. The ClamAV detection and ML classifier strongly indicate malicious intent, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://xezojetit.ru/wix?keyword=bernard+of+clairvaux+sermons+on+the+song+of+songs+summary
    • https://migobajiker.weebly.com/uploads/1/3/5/3/135390735/9484461.pdf
    • https://vubilidupetox.weebly.com/uploads/1/3/0/9/130970012/8782120.pdf
    • http://republvinb.fun/facebook_lite_app_for_nokia_e63x7mq9.pdf
    • http://1gusevshop.space/vipefozaworukevoluvipafevx6vg.pdf
    • https://lewefuno.weebly.com/uploads/1/3/4/0/134041273/limizudorotowijekofo.pdf
    • http://evromotors.net/mercruiser_5.0_mpi_for_sale_uk9kuw2.pdf
    • http://picply.ru/82617983948df01p.pdf
    • http://mkr-olimp.info/852168800755xq9e.pdf
    • http://clubstore.pro/davis_drug_guide_online_discount_code1sv46.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://a98f38e8-5810-4fc9-be6a-c3d78c7c4f9f.filesusr.com/ugd/921909_66c10b2b11094bdeb7f94b1001d4dde8.pdf?index=true
    • https://b73db3ac-2e3c-475a-83ab-7f4668f00a8f.filesusr.com/ugd/80e8fa_79d6a29d6dad4ff6a9c477ca367e3cee.pdf?index=true
    • https://s3.amazonaws.com/tigewibejageju/army_shooting_games_free.pdf
    • https://s3.amazonaws.com/fizup/16903722260.pdf
    • https://f89b8795-a90f-4359-81e0-6309601a98d9.filesusr.com/ugd/8e7730_ffd26b0cc2fd4a1aadf472c2ce421001.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011f79.bin
75004ea9ae23a719b8b63ab41fcf34019aa5c8ca444992c84e97c1e98f5f7ab5
pdf-font-stream PDF embedded font (sfnt) at offset 0x11F79 5712 bytes
font_01_sfnt_off000132dd.bin
f9a342b9618dfa0efe3eec66e629a04a63b6894efadefa7c5688cfa9d2f4d2a0
pdf-font-stream PDF embedded font (sfnt) at offset 0x132DD 10536 bytes