Malicious PDF — malware analysis report

Static analysis result for SHA-256 38fd1e0d315360de…

MALICIOUS

PDF

85.5 KB Created: 2021-09-18 06:59:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: fdf27c30010a94f0460450faf6ff2bea SHA-1: 0ee23157902accedcd8eed6e28e795fc600575fc SHA-256: 38fd1e0d315360dec9b851085c98ff166ada950e7a1eb090e3ef3e2239d1a6e7
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a high-severity heuristic firing for a random URL link, pointing to a suspicious PDF file. The ML classifier and ClamAV also flagged this file as malicious, specifically as a phishing trojan. The presence of embedded URLs and the nature of the heuristics suggest an attempt to trick the user into downloading a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://trouver-une-ssii.com/img/pics/files/54396692673.pdf In PDF document text
    • http://sun-green.de/ckfinder/userfiles/files/98502321539.pdfIn PDF document text
    • http://lamorenj.com/userfiles/files/45120942814.pdfIn PDF document text
    • http://zonazero.es/userfiles/file/86318273126.pdfIn PDF document text
    • http://erex.hu/upload/file/buxuzopozufejipibuda.pdfIn PDF document text
    • https://benhgout.net/uploads/Files/file/75720530414.pdfIn PDF document text
    • http://abbuffalowings.com/uploads/files/womurokepinim.pdfIn PDF document text
    • https://tidurmalam.com/contents/files/84947229383.pdfIn PDF document text
    • https://vrindaindia.com/php/joseph/uploads/file/78903544132.pdfIn PDF document text
    • http://dakov.hu/_user/file/sawikiwepukese.pdfIn PDF document text
    • http://uhorder.com/upload/files/15280802390.pdfIn PDF document text
    • https://zippy-inc.com/app/webroot/userfiles/files/zinikaditikidu.pdfIn PDF document text
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/137f27938534865a313ccce24472c7ed/23201445302.pdfIn PDF document text
    • http://toyotaquangninh.org/data/dulieu/files/72952246447.pdfIn PDF document text
    • http://carraracucinecomponibilitrapani.it/userfiles/files/kufaxaputodezozasutigupeb.pdfIn PDF document text
    • https://shturnev.com/files/foFKED/file/60073011848.pdfIn PDF document text
    • http://sreema.org/FCKeditor/file/64478761804.pdfIn PDF document text
    • http://www.gleason.com.au/application/third_party/ckfinder/userfiles/files/fuwodufotepixebefa.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/1613a771a49e63---38974214410.pdfIn PDF document text
    • http://indcms.testingmachines.com/images/file/94557573227.pdfIn PDF document text
    • http://romengo.com/ckfinder/userfiles/files/61939958523.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=interactive+buddy+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_off0000e40a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE40A 19968 bytes
SHA-256: 40a84f0bc3ee3d8f58871c93a14e91ddaf079e9e17d8c832e136ce8024eb9cd7
font_01_sfnt_off000118da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118DA 10520 bytes
SHA-256: 2808d62d3ce40fe995b1b8735492016fa3f12bb9ab1fef27aa1ea7727afcc7d1
font_02_sfnt_off000130fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130FD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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