Malicious PDF — malware analysis report

Static analysis result for SHA-256 162099b35b35b3a9…

MALICIOUS

PDF

75.9 KB Created: 2021-09-21 04:01:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: e75279ec21d100d62acb498164e449c8 SHA-1: 6fea470c0773c96824aafdb469a98433a83e3393 SHA-256: 162099b35b35b3a94960d05def87ba1467638e1aa0a3e3810afcc25ceb32efb3
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. The PDF contains numerous embedded URLs and is structured as a link farm, with many distinct hosts, suggesting an attempt to direct users to malicious websites. While no scripts were explicitly extracted, the PDF structure and the nature of the URLs indicate a phishing or malware distribution attempt, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://www.mtiwelding.co.uk/admin/ckfinder/userfiles/files/55762643948.pdf In PDF document text
    • https://szallas-karpatalja.net/upload/poterujumoxux.pdfIn PDF document text
    • http://medicare-darmstadt.de/bilder/UserImages/file/86136827893.pdfIn PDF document text
    • http://dcbestwings.com/uploads/files/17486284512.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138577ae5af7---zibogugore.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1612ee30375156---54164777086.pdfIn PDF document text
    • http://atrsara.ir/resource/files/vusirorekuvuwexoluwi.pdfIn PDF document text
    • http://tatugigo.com/ckfinder/userfiles/files/52251598731.pdfIn PDF document text
    • https://e-motorcycle.tw/upload/emotorcycle/files/69629507595.pdfIn PDF document text
    • https://nangluongvada.com/uploads/files/vasudemuwonido.pdfIn PDF document text
    • http://buyo-g.net/userfiles/file/sejavukijine.pdfIn PDF document text
    • http://xn--80aer5aza.xn----htbdepbihnfb8cyg.xn--p1ai/ckfinder/userfiles/files/wunivufifaxefexawi.pdfIn PDF document text
    • http://ibrahimalsada.com/pics/file/52872290435.pdfIn PDF document text
    • http://teresachild.com/upload/files/senejamalo.pdfIn PDF document text
    • https://bomnuocebara.com/quangbasanpham/app/webroot/upload/image/files/fexitepatukosafi.pdfIn PDF document text
    • http://dhf-china.com/d/files/85053965208.pdfIn PDF document text
    • http://grandp.ru/userfiles/file/57811513768.pdfIn PDF document text
    • http://www.humillacionyestrella.org/ckfinder/userfiles/files/71052321318.pdfIn PDF document text
    • http://biosystech.com/pdsFck/file/80467577240.pdfIn PDF document text
    • http://kashima.cc/userfiles/file/33150236073.pdfIn PDF document text
    • http://ttfi.org/app/webroot/userfiles/file/36011605406.pdfIn PDF document text
    • http://debsecond.net/UserFiles/File/63964542627.pdfIn PDF document text
    • http://gorsilawfirm.com/userfiles/file/kopuvuzafotisufut.pdfIn PDF document text
    • http://bobhendrix-law.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/kariledetanaxuvovinunufe.pdfIn PDF document text
    • http://baloneacessorios.com/_upload/file///16823663948.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=mektoub+my+love+canto+uno+watch+onlinePDF 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_off0000c185.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC185 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d997.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD997 18544 bytes
SHA-256: 7e13c423e9de421554f5bebd643a0d741a9638b903556894e64654b2b947b4b8
font_02_sfnt_off000108a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108A2 10816 bytes
SHA-256: a36f67880e5c42addde03a4bd71f272666297735ca198f7d4ac35757d4696fff