Malicious PDF — malware analysis report

Static analysis result for SHA-256 05d3e0d09efb3118…

MALICIOUS

PDF

85.4 KB Created: 2021-09-17 23:08:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: c28412bf100aeae49d58f9494037907b SHA-1: fbfc55ee7126979c97a396fd875f4beb6879ad2d SHA-256: 05d3e0d09efb31186fda41df4992547fcb8b53c0704e688105db18e0694715b3
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous external URIs and is identified as a link farm on disposable hosting, suggesting it's designed to redirect users to potentially harmful websites. While no scripts were explicitly extracted, the PDF structure and embedded URIs strongly suggest a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://archism.ru/uplcv?utm_term=best+pic+apps+for+android PDF link annotation
    • http://texmet.pl/userimages/file/20855649622.pdfIn PDF document text
    • http://thomasgearon.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/20814910723.pdfIn PDF document text
    • http://xn----7sbjvweekof5d.xn--p1ai/files/files/62995798122.pdfIn PDF document text
    • https://juvelyrikoscentras.lt/Files/file/50561940400.pdfIn PDF document text
    • http://dierenwinkelindex.nl/images/uploads/sorezatorinulonor.pdfIn PDF document text
    • http://pm-property.pl/userfiles/file/15164794763.pdfIn PDF document text
    • http://thueotodn.com/uploads/image/files/38609848961.pdfIn PDF document text
    • http://terralis.net/catalogue_dynamique/file/rasudegatinulapibediwuv.pdfIn PDF document text
    • http://fcraregistration.com/UploadedData/file/mikazizasetat.pdfIn PDF document text
    • http://pjzhengwang.com/upload/file/20210909_043435_120.pdfIn PDF document text
    • https://mdteam.se/ckfinder/userfiles/files/30972925845.pdfIn PDF document text
    • http://www.motocams.cz/ckfinder/userfiles/files/pepetusugunubuxiwileguzo.pdfIn PDF document text
    • http://canshu.dlzj.net/upload/files/20210906064829386813.pdfIn PDF document text
    • http://getwealthythisyear.com/ckfinder/userfiles/files/bedepizopapemekobow.pdfIn PDF document text
    • http://kondicionery-domodedovo.ru/upload_picture/file/99855315488.pdfIn PDF document text
    • https://pataniforum.com/admin/jquery/ckfinder/userfiles/files/wuvosulok.pdfIn PDF document text
    • http://gyndoktors.de/ckfinder/userfiles/files/36017613412.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16130b2f41924b---jotexugilulivejotadokeku.pdfIn PDF document text
    • https://study-abroad-travel.com/ckfinder/userfiles/file/wirobiloz.pdfIn PDF document text
    • https://intersat.lv/files/file/10425294623.pdfIn PDF document text
    • http://neapol-m.ru/usr/file/21969088323.pdfIn PDF document text
    • http://mywayrtk.info/userfiles/file/92088114405.pdfIn PDF document text
    • http://iccjsc.vn/images/uploads/files/jejivabaxarojikinuretitut.pdfIn PDF document text
    • https://nls.vn/upload/files/67093465652.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_off0000e81c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE81C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001002e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1002E 18056 bytes
SHA-256: f05ed8600b789d543c991fa7f27490d3b7ebe599582206e8eb7119bfd1f5b328
font_02_sfnt_off00012f1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F1B 10620 bytes
SHA-256: 7fd929ccba7f0bc67336c8d9a71266ec5cf0e2cfccbb1b0c1eea4fe5cf92056b

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