Malicious PDF — malware analysis report

Static analysis result for SHA-256 6091ec025e9e962c…

MALICIOUS

PDF

79.2 KB Created: 2021-09-09 12:15:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 86fc46f77a3cc4dbfcffd896162d4ae1 SHA-1: 4da4cf60db20e6ae99c4297d2047dba168f33884 SHA-256: 6091ec025e9e962cf83be6231be16d36eb7f581bb8490ea6a3aa1e4cdee6b33d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document contains numerous links to potentially disposable domains, suggesting a tactic to obscure malicious destinations. While no scripts were explicitly extracted, the presence of embedded URLs and the overall structure point towards a phishing or malware distribution attempt, likely initiated via spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://creativitagh.com/pevron/www/img/file/muwewavadivajekepukire.pdf In PDF document text
    • http://picart-personal.pl/fckupload/upload/file/89340331377.pdfIn PDF document text
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/5dcf0f5065411d56ffec2ef9a24df3ae/duzirojiwobi.pdfIn PDF document text
    • http://puzynowska-kancelaria.com/userfiles/file/1379990369.pdfIn PDF document text
    • https://sasalidayanisma.org/uploads/file/92516890353.pdfIn PDF document text
    • https://www.delaneyllc.com/ckfinder/userfiles/files/rividek.pdfIn PDF document text
    • http://www.c-l-r-p.com/admin/ckfinder/userfiles/files/44779255897.pdfIn PDF document text
    • http://ecolservizinettuno.com/userfiles/files/govoxedexewitimuguf.pdfIn PDF document text
    • http://xn--m1age8bh.xn--p1ai/files/file/55029941114.pdfIn PDF document text
    • http://kdwatch.net/upload/files/2021090720194458.pdfIn PDF document text
    • http://www.ctmmaximoravenna.com/ckfinder/userfiles/files/1002906363.pdfIn PDF document text
    • http://influences-vegetales.eu/assets/Image/files/14010766429.pdfIn PDF document text
    • http://aktien-analyse.de/images/File/42972399669.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/lvor2fdbhqtqg0jbi36u6he65b/moboxu.pdfIn PDF document text
    • http://simkoongschool.com/uploads/editer/files/63501831368.pdfIn PDF document text
    • https://vialivonica.eu/userfiles/files/pezitunudojafapag.pdfIn PDF document text
    • https://kingwaterpure.com/ckfinder/userfiles/files/lawawejodesawufoxajulavi.pdfIn PDF document text
    • http://nsdadventist.org/FCKData/file/gilabujuzofulupafufegisug.pdfIn PDF document text
    • http://www.teaterskolen-efteruddannelsen.dk/ckfinder/userfiles/files/42441872587.pdfIn PDF document text
    • https://nycsmindia.org/ckfinder/userfiles/files/54282375045.pdfIn PDF document text
    • http://warehousetraining.ie/images/93158616274.pdfIn PDF document text
    • http://originalcheck.it/public/img_admin/file///34686756400.pdfIn PDF document text
    • http://medius.sk/userfiles/file/fumume.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=how+to+check+conference+call+in+androidPDF 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_off0000d437.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD437 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ec49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC49 16504 bytes
SHA-256: f96a245f0ef65f7b7d3b6ceeccc441ca47e5e2fff30416caf9344606887377f5
font_02_sfnt_off000116fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116FC 10572 bytes
SHA-256: 8b827c0a0a8c784fef89ad2480da6a41274144ab3bb040380b80b361a8f4c9cd