Malicious PDF — malware analysis report

Static analysis result for SHA-256 9bd701328fd49621…

MALICIOUS

PDF

72.1 KB Created: 2021-09-18 14:05:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 11960a1bb2b7e9a0cc8b0c77375dcb55 SHA-1: aa6fb718046f54542843246d5ef7542d241ce8f8 SHA-256: 9bd701328fd4962167fe723c95d70637db91dbcd1c9e492fc023c417e1532421
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected by ClamAV as Pdf.Phishing.Trojan and an ML classifier flagged it with high confidence. The PDF contains numerous embedded URLs pointing to external domains, many of which are associated with link farms or disposable hosting, suggesting a phishing or redirection scheme. While no scripts were explicitly extracted, the PDF structure and heuristic firings indicate it's designed to lead users to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 5

  • 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.
  • 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://cochleartudaskozpont.hu/files/lamegozisa.pdf In PDF document text
    • http://gizmakina.com/depo/sayfaresim/file/64408416295.pdfIn PDF document text
    • https://somogyplusz.hu/files/60024526352.pdfIn PDF document text
    • http://massintech.ru/img/outer/files/zonavotusudimitujebigus.pdfIn PDF document text
    • http://kammatrans.com/userfiles/files/towixukuvilojevobog.pdfIn PDF document text
    • http://nofatrans-int.com/userfiles/file/vaxebegegegoxeteniwiji.pdfIn PDF document text
    • http://lesbambousbleus.fr/ckeditor/upload/files/gawuwebovupaforeregulu.pdfIn PDF document text
    • http://nathulaldasptti.com/ckeditor/ckfinder/userfiles/files/logakodakusopusete.pdfIn PDF document text
    • http://debsecond.net/UserFiles/File/62569782795.pdfIn PDF document text
    • https://marljivo.hr/UserFiles/files/lurutanimojixikin.pdfIn PDF document text
    • http://tehla.eu/userfiles/file/13194297192.pdfIn PDF document text
    • http://podwierzba.eu/ckfinder/userfiles/files/sokoto.pdfIn PDF document text
    • http://hongsung114.com/files/fckeditor/file/44284853227.pdfIn PDF document text
    • http://schokofontaene.de/idata/76237561544.pdfIn PDF document text
    • http://www.kevimotor-rock.hu/files/files/73233113305.pdfIn PDF document text
    • https://underworldgear.com/upload/users/files/9921284756.pdfIn PDF document text
    • http://clickvay.com/upload/files/ropilinagozafemoz.pdfIn PDF document text
    • http://www.chubsorn.com/file/files/vopabasodazolobezezumidi.pdfIn PDF document text
    • http://resetimpianti.it/reset/public/file/gatovabixatokilax.pdfIn PDF document text
    • https://tahitotfaluovodak.hu/ckfinder/userfiles/files/lilopezerofudefimiva.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141d2630dfd4---2100261193.pdfIn PDF document text
    • http://dieukhactransam.com/uploads/files/35051795556.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136e3d99126b---nisirupujipezovi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=medimagic+mod+apkPDF 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_off0000b84c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB84C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d05e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD05E 16072 bytes
SHA-256: c203f10f464ee08c9be25efdade49c84ba80c179e42701f678d5e2f02941030f
font_02_sfnt_off0000f9a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9A6 10424 bytes
SHA-256: aa56877bc5f03c0c08dd99872e02cd917813115c82f535c796e5c75c055fb9fc