Malicious PDF — malware analysis report

Static analysis result for SHA-256 530b7b0ef19f1fc0…

MALICIOUS

PDF

78.3 KB Created: 2021-09-10 03:15:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: dba55fa880a6316e470526e1860ee957 SHA-1: d9334e624070ba9272c91d74a48a97b0dc6a1b94 SHA-256: 530b7b0ef19f1fc09e9818a3ff9574b06fffbef69a621e5d4b0431c789a5eb48
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external links, with one heuristic specifically identifying it as a link farm on disposable hosting, suggesting a phishing or malware distribution lure. While no scripts were explicitly extracted, the PDF structure and embedded URIs point towards an attack pattern involving redirection to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://dolphinsolutions.net/ckfinder/userfiles/files/11717220605.pdf In PDF document text
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a81fb1efa4---kulodobefagalelobuzom.pdfIn PDF document text
    • https://newtech-utm.pl/userfiles/file/vozalenokonaluvi.pdfIn PDF document text
    • http://playeasypiano.com/resources/fck_images/nizebixasip.pdfIn PDF document text
    • https://cissud.eu/uploads/ck_editor/files/76250813204.pdfIn PDF document text
    • https://bankubezpieczen.pl/userfiles/file/togawupujuwajul.pdfIn PDF document text
    • https://digireg.at/upload/gaverunegenitadoxepa.pdfIn PDF document text
    • http://branonperformance.com/ckfinder/userfiles/files/xavos.pdfIn PDF document text
    • http://ageddfjtj.pretty-match.com/upload/files/95164027327.pdfIn PDF document text
    • https://cambodiadriverservice.com/userfiles/file/76354826940.pdfIn PDF document text
    • http://zenobiacultura.it/userfiles/file///woneti.pdfIn PDF document text
    • http://matstravel.ru/userfiles/file/kipitajelogilaxajer.pdfIn PDF document text
    • https://chilegastronomia.cl/uploads/userfiles/files/raxetaziliselunudigi.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1612f175a1c4b3---miritewefedulefowifizo.pdfIn PDF document text
    • http://asacnfservices.com/ckfinder/userfiles/files/naxapezasovixutoroxo.pdfIn PDF document text
    • http://gma.ge/admin/ckeditor/ckfinder/userfiles/files/74667002281.pdfIn PDF document text
    • http://contextuae.com/resimler/files/9966710491.pdfIn PDF document text
    • http://motovelo-nmsk.ru/userfiles/file/vivewatowuruled.pdfIn PDF document text
    • http://v-lukomorie.com/uploader/files/76432865342.pdfIn PDF document text
    • https://kristaldicarlo.com/userfiles/file/pigitudopola.pdfIn PDF document text
    • https://total-sport.pl/img/upload/files/dakugirewenag.pdfIn PDF document text
    • http://santeh.md/img/files/diwigizoxizepuvelasoxoker.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=power+of+subconscious+mind+free+pdfPDF 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_off0000ce7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE7E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e695.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE695 10800 bytes
SHA-256: cd0ada584e9e8c04d8ed44479408d4f8b2dec53bc30fe0116f911838a1590fbf
font_02_sfnt_off0000ff52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF52 17528 bytes
SHA-256: b7fcf3aa39dbfd65fdb9f4fabfe05d0b4e4b943b335a25ede9609763b01011d7

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