Malicious PDF — malware analysis report

Static analysis result for SHA-256 6910cbcdb998e11a…

MALICIOUS

PDF

77.2 KB Created: 2021-09-20 07:10:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 0c56d937dc8134feba8771dbac6491f5 SHA-1: eefc840270ad54253c1ad39c7fce7221057b057e SHA-256: 6910cbcdb998e11a57524cf984248ecff8dd4b4c2f1e41e85b37ebca04895ef3
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for executing malicious code. The PDF also contains a large number of external URIs, many of which point to disposable domains, suggesting a phishing or malware distribution attempt. ClamAV detection and ML classification further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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 http://www.haztartasigepszakuzlet.hu/pics/file/wodosefowigegelo.pdf In PDF document text
    • http://pttaccounting.com/userfiles/files/51964899883.pdfIn PDF document text
    • https://mystruggle.uk/indigo/ckfinder/userfiles/files/bodofebodedonaz.pdfIn PDF document text
    • http://fujiya-burbank.com/uploads/files/rivakifobanew.pdfIn PDF document text
    • http://antonio-pelella.eu/userfiles/files/jupofadukowijer.pdfIn PDF document text
    • https://paysecure.ro/ckfinder/userfiles/files/37877770865.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f20eccea3b---lubumupuxogifototaderoz.pdfIn PDF document text
    • http://1careglobal.com/upload/files/19801858365.pdfIn PDF document text
    • http://grandfiltr.com/files/file/zopovivipobusejoxavop.pdfIn PDF document text
    • https://www.thaiahpa.com/flash/files/23567226499.pdfIn PDF document text
    • http://studiotecnicomancini.eu/userfiles/files/58483981054.pdfIn PDF document text
    • http://dentherapia.hu/files/file/gilizidamenalimamig.pdfIn PDF document text
    • http://csc021.com/userfiles/file/20210914115043_un4yhg.pdfIn PDF document text
    • https://armature.ir/cache/fck_files/file/gepere.pdfIn PDF document text
    • http://studioturina.com/userfiles/files/89393240290.pdfIn PDF document text
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613e67ef55f23---jexuwositudijazolejug.pdfIn PDF document text
    • http://darangyi.com/userData/board/file/bamojamugudemaf.pdfIn PDF document text
    • http://kristiankutschera.de/userfiles/file/88716089616.pdfIn PDF document text
    • https://daiichitravel.com/uploads/news_file/tuzegedix.pdfIn PDF document text
    • http://gamax-motor.cz/data/dokumenty/bamimon.pdfIn PDF document text
    • http://www.thegrcinstitute.org/app/webroot/js/ckfinder/userfiles/files/losobarek.pdfIn PDF document text
    • https://semsaesp.com/ckfinder/userfiles/files/zomagutaziloxoj.pdfIn PDF document text
    • http://kapsalonvogue.nl/files/file/birotuditujaxadapiga.pdfIn PDF document text
    • http://dh-life.com/ckfinder/userfiles/files/5352955864.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=fifa+20+android+mobilePDF link annotation
    • 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_off0000ca17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA17 10608 bytes
SHA-256: 1242d14069caf35f54d7291ed2721fb9fd821385a85d78ecc5d13db22d7081d4
font_01_sfnt_off0000e23a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE23A 17408 bytes
SHA-256: 9fefb61b62a0a6848b50bd745eb34d4efe332fda4962676ae82013139bab4d02
font_02_sfnt_off00010f24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F24 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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