Malicious PDF — malware analysis report

Static analysis result for SHA-256 61e9aa86610d47e8…

MALICIOUS

PDF

74.5 KB Created: 2021-09-19 20:46:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: bb31c2970d51a37f9a00f2a013bccb09 SHA-1: dff0a1dee2224fd92ef5c9bfc7e10710c349a436 SHA-256: 61e9aa86610d47e84342b795cdba973ecf938b5e28d40a459bd9ead909d8a489
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs that point to disposable hosting, characteristic of a link farm designed to redirect users to malicious sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests this is a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 5

  • 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 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://pistant.ru/uplcv?utm_term=sm64+download+rom PDF link annotation
    • http://www.hermosabeachbungalows.com/userfiles/files/sanovodarabi.pdfIn PDF document text
    • https://rosebankprimary.co.za/inc/ckfinder/userfiles/files/lejegopej.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/161316a0e203f4---46446516438.pdfIn PDF document text
    • https://luxurybaths.marblobaths.ph/app/webroot/img/files/59687201014.pdfIn PDF document text
    • http://hide-bo.com/img/tmp/file/62667111851.pdfIn PDF document text
    • https://spheresignal.com/app/webroot/userfiles/files/43761453406.pdfIn PDF document text
    • http://tuzvedo.hu/elemek/file/mevibogutorokumewekilifa.pdfIn PDF document text
    • https://otoform.com/upload/ckfinder/files/34445121838.pdfIn PDF document text
    • http://gcsiva.com/files/userfiles/file/30472915558.pdfIn PDF document text
    • http://haitrungkim.vn/uploads/userfiles/file/sipubujufezimonuxomavipo.pdfIn PDF document text
    • https://ssmavidiyar.com/public/content-images/files/sifawigemovelorimigupejoj.pdfIn PDF document text
    • https://pensiuneavalentina.ro/app/webroot/file/xevomogatasujuponojipug.pdfIn PDF document text
    • http://iccjsc.vn/images/uploads/files/wigox.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c338f5adba---52748981962.pdfIn PDF document text
    • https://paulogomeslda.com/userfiles/file/56791147738.pdfIn PDF document text
    • http://csc021.com/userfiles/file/20210913232820_nznp3i.pdfIn PDF document text
    • https://mahanakhon.pacedev.com/ckupload/files/6888465956.pdfIn PDF document text
    • https://svltv.in/userfiles/files/40831734166.pdfIn PDF document text
    • http://www.scenekunstskolen-efteruddannelsen.dk/ckfinder/userfiles/files/budufuresaluxifaxewi.pdfIn PDF document text
    • https://whatshoulditcostme.com/userfiles/file/35719401161.pdfIn PDF document text
    • http://nanopena.cz/upload/file/roxisaw.pdfIn PDF document text
    • http://janjoling.com/public/ckfinder/userfiles/files/14329345632.pdfIn PDF document text
    • http://sotel-perm.ru/site/file/rovavugamotulidorazanoje.pdfIn PDF document text
    • http://modern-pro.ru/files/file/50397047213.pdfIn PDF document text
    • http://emilygrilltogo.com/uploads/files/wakodeweje.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c276.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC276 16692 bytes
SHA-256: 9c8d72711d1a9573d2f9843389aef1f50a057deb0cff3918027b6ca51393be01
font_01_sfnt_off0000ed69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED69 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010580.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10580 10324 bytes
SHA-256: 0c659cf8d9762abddf11c94692b242a5ed8d94b34e7153b06e3ad67172db6730