Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb0e56c4d18842d6…

MALICIOUS

PDF

75.3 KB Created: 2021-09-23 14:35:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 655625b65356a1be8b737d73dbae6cb4 SHA-1: 589212f01dabfa9104d3a8f9900d5d2175bdb6e2 SHA-256: bb0e56c4d18842d6f0d2eee80a70e006588f6688c75f2fc20d56a921195448e1
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and is identified as a link farm hosted on disposable domains, strongly suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection further confirm its malicious nature. Although no scripts were explicitly extracted, the PDF structure and embedded URLs indicate an intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://ketchas.ru/uplcv?utm_term=what+do+you+name+an+animal+in+minecraft+to+make+it+upside+down PDF link annotation
    • http://nadiadsa.org/userfiles/file/pimugiwemukojapesaw.pdfIn PDF document text
    • http://opusincertum.it/userfiles/files/gujogalogozirepegamu.pdfIn PDF document text
    • http://drairtools.com/ckfinder/userfiles/files/xidivotilojezadenarugit.pdfIn PDF document text
    • http://thaisomboonautopart.com/userfiles/files/xalew.pdfIn PDF document text
    • http://emeat.ru/var/files/75773295174.pdfIn PDF document text
    • http://vektor-bezpeki.com/userfiles/files/wagibogedu.pdfIn PDF document text
    • http://ducnhua.com/upload/files/jurariw.pdfIn PDF document text
    • https://adikketiga.com/contents/files/sorereligonakudobeb.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/1614c4f751becd---biluz.pdfIn PDF document text
    • http://bosch-elektronarzedzia.pl/catalog/file/52670831146.pdfIn PDF document text
    • https://aksusu.com/upload/files/26109335774.pdfIn PDF document text
    • http://wx-test.com/upload/ckimg/files/202109072131305576.pdfIn PDF document text
    • http://www.salac.cz/ckfinder/userfiles/files/975886419.pdfIn PDF document text
    • http://alhambra.kopanramen.com/uploads/files/80243249359.pdfIn PDF document text
    • http://congseng.com/uploadfile/files/pososogejufev.pdfIn PDF document text
    • http://www.herbertvanderbrugghen.nl/draft/muwigelupewupokak.pdfIn PDF document text
    • https://oglethorpeclub.org/~oglethor/UserFiles/file/wigasitulanox.pdfIn PDF document text
    • http://hantechwelding.com/userfiles/file/2021090512364873499.pdfIn PDF document text
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/22bba749baf76e687b7065c0f3d434f8/77312747596.pdfIn PDF document text
    • http://fijiembajak.com/uploads/ck_uploads/files/86746604763.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_off0000be75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE75 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d687.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD687 18216 bytes
SHA-256: 68515e8cbc842e873004461c24a095392e90f1fe47ebe182488bc567f7c7de45
font_02_sfnt_off00010562.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10562 11272 bytes
SHA-256: d94a964096dcbb635db197f9b8870daf6da82b200e9742680dbf4b2fa3c92bac

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