Malicious PDF — malware analysis report

Static analysis result for SHA-256 5af7028491180be6…

MALICIOUS

PDF

68.9 KB Created: 2021-09-14 09:36:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 8b6cae59fb9afb8a7c974668440a5a07 SHA-1: dcbed7ac7a5b980c3df31aa2b654de371054b637 SHA-256: 5af7028491180be693fa53e0eb5521e3d4d9afe2d9d45997ed3774caa433e65d
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF is identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing lure with an image overlay and a click-outward action. The document contains numerous embedded URLs, many of which point to potentially disposable hosting, suggesting a link farm or redirection mechanism. The primary purpose appears to be directing users to external malicious sites, likely for credential harvesting or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 1 text block(s), carries a click-outward action, and is only 68 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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 http://titadoorbinhduong.com/upload/files/potubosemitolivibinokilu.pdf In PDF document text
    • https://avphunter.ro/ckfinder/userfiles/files/nubikudomevobobebu.pdfIn PDF document text
    • http://maristaslardero.es/userfiles/file/92702407146.pdfIn PDF document text
    • http://lepetitjaunais.com/userfiles/file/sikatokiwik.pdfIn PDF document text
    • http://old.bgk-meshkova.com/ckeditor/ckfinder/userfiles/files/nulurejatisig.pdfIn PDF document text
    • https://www.privathospitaletkollund.com/ckfinder/userfiles/files/zejazunar.pdfIn PDF document text
    • https://nstoplana.rs/ckfinder/userfiles/files/xegawotomeguzopozamuxa.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/3343535421.pdfIn PDF document text
    • http://fotosvatba.net/userfiles/file/pareburuzuwida.pdfIn PDF document text
    • https://mimpishio2bet.net/contents/files/dewunizetabow.pdfIn PDF document text
    • http://skpizzasubs.com/uploads/files/podigapasuvubad.pdfIn PDF document text
    • http://guide-eq.com/userfiles/file/20210912191321_gmsaf7.pdfIn PDF document text
    • http://medwin.kr/userData/board/file/vorajevanukugazebabimo.pdfIn PDF document text
    • http://gonganmi.com/userfiles/file/bitukujatovavuxalen.pdfIn PDF document text
    • http://citescolairedeledit.com/include/file/52188326077.pdfIn PDF document text
    • https://equinox-e.com/upload/files/89980159925.pdfIn PDF document text
    • http://drukarnia-warszawa.pl/pliki/file/91775642925.pdfIn PDF document text
    • http://dietaltop.com/userfiles/files/5542601889.pdfIn PDF document text
    • http://westpakusa.com/phpsites/vertical_living/uploads/file/leduwezafapezijiwujumuva.pdfIn PDF document text
    • http://seychelles-resort.com/images/blog/file/24939502661.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/16138be66e472d---bafulugapururigafufaxobir.pdfIn PDF document text
    • http://guoyangmoju.com/userfiles/files/bokifalanux.pdfIn PDF document text
    • http://s2ipower.com/survey/userfiles/files/78657557599.pdfIn PDF document text
    • http://lednotice.com/userData/board/file/93127248728.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=restore+deleted+pics+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_off0000b1bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1BF 14340 bytes
SHA-256: ba6be31cd9d324cac2208ee4134cb79382a469cf67a1419534244b0ff0e0ccf7
font_01_sfnt_off0000d54c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD54C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ed63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED63 10552 bytes
SHA-256: 47118cb8626ba1b256962793db9cba79f0af5b22197b35105ee29580a19b1837