Malicious PDF — malware analysis report

Static analysis result for SHA-256 e03600e7c2e5cc26…

MALICIOUS

PDF

78.8 KB Created: 2021-09-16 15:52:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 1eb8caadb84d3683b0ca3f0823ef0018 SHA-1: 0f95171171ea791ee5f7d4df8628fb8bc0ab1730 SHA-256: e03600e7c2e5cc260924aa5ba59aca19ad123658923090642f298664d9373ba9
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a large number of external links, suggesting a phishing or spamming operation. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9944

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://toptenstudy.com/upload/files/BodyFile__6136194984D80.pdf In PDF document text
    • http://marthomaiticherukole.com/userfiles/file/jovijukoxeritute.pdfIn PDF document text
    • http://feg.vn/uploads/files/69194258565.pdfIn PDF document text
    • https://eetravel.net/file/dujibujazetob.pdfIn PDF document text
    • http://zsmnowakowski.pl/userfiles/file/92125660884.pdfIn PDF document text
    • http://www.srijonihealinghome.com/fckimages/file/numusukinitodefiku.pdfIn PDF document text
    • https://chambres-lannion.fr/userfiles/file/73752223831.pdfIn PDF document text
    • https://aynadakikemalizm.com/resimler/files/39145261596.pdfIn PDF document text
    • http://somkuthyoptika.hu/editor_up/21224015020.pdfIn PDF document text
    • http://immobilieninvestors.com/userfiles/file/kapadutexatidod.pdfIn PDF document text
    • https://renetravel.ro/images/files/49018617541.pdfIn PDF document text
    • https://ratosatu.com/contents/files/damopozasejomewurofomij.pdfIn PDF document text
    • http://rosesrealtyhomes.com/userfiles/files/fuvarem.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/sevilikodozisojuju.pdfIn PDF document text
    • http://metamorfoza-krosno.pl/userfiles/file/kezubu.pdfIn PDF document text
    • http://nut-shell.net/upload/files/puzomajafusurezifi.pdfIn PDF document text
    • http://www.thegrcinstitute.org/app/webroot/js/ckfinder/userfiles/files/kudomozulaxogakoravuvetuv.pdfIn PDF document text
    • http://enricobarraco.com/files/67713310541.pdfIn PDF document text
    • https://alarrabnews.com/images/content/content/file/koxenuzuju.pdfIn PDF document text
    • http://pttaccounting.com/userfiles/files/73877576753.pdfIn PDF document text
    • http://franklcalabreseattorney.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/mifexutat.pdfIn PDF document text
    • https://lifesmart.lifesmart.ro/ckfinder/userfiles/files/31654782803.pdfIn PDF document text
    • http://jowinbio.com/upload/files/202109130450496858.pdfIn PDF document text
    • http://vector-luczak.pl/new/fck_user_files/file/80482566120.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=swords+and+souls+a+soul+adventure+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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b498.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB498 16060 bytes
SHA-256: 64af0185a2beffa7382febdf957b2ddd2015d3985e5bc97cf8ad64f3c2914973
font_01_sfnt_off0000c9ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9AE 10880 bytes
SHA-256: 3db651725508622fa449b6ba8e2ca2ba089119a6f486970fa8a0aa69378d1287
font_02_sfnt_off0000e2e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2E5 19168 bytes
SHA-256: f35a23d64695d77001ef612f77f67216f7f0158ef18015359cddba64110871a7
font_03_sfnt_off000112f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112F5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1