Malicious PDF — malware analysis report

Static analysis result for SHA-256 177e7b1987984e6c…

MALICIOUS

PDF

87.4 KB Created: 2021-03-22 02:10:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f7b1dfd41fde690de21d1c9420d34d9d SHA-1: d66b3687de480d11dec7d6b91112801a0a147697 SHA-256: 177e7b1987984e6c95ea098923fbf7a5ef6128d51ed8eca51fb58ceae148b3f5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of external links, many of which point to potentially malicious domains, suggesting an SEO spam or phishing campaign. The heuristic PDF_SEO_LINK_FARM indicates a mass of external links, and one of the primary URLs is associated with a keyword that appears to be a lure. While no scripts were explicitly extracted, the PDF structure and the nature of the links suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://kuzutuzo.ru/award?keyword=rutina+de+ejercicios+abdominales+en+casa+pdf
    • https://vawevoza.weebly.com/uploads/1/3/1/4/131482963/pudola_wuwop_guzik.pdf
    • http://afracheat4.xyz/84722669190r6oqg.pdf
    • http://tersq.fun/15385156475r7xco.pdf
    • https://fenotitejov.weebly.com/uploads/1/3/5/3/135316040/xotudazira.pdf
    • https://jeludumekidi.weebly.com/uploads/1/3/2/7/132740852/nowekafimibedus.pdf
    • https://cdn-cms.f-static.net/uploads/4463807/normal_603dc1ff3db99.pdf
    • https://vugadeji.weebly.com/uploads/1/3/1/4/131406436/vudemixelilutesi.pdf
    • https://cdn-cms.f-static.net/uploads/4367297/normal_5fe6b2b984aec.pdf
    • https://static.s123-cdn-static.com/uploads/4465025/normal_5fc59ffc6729f.pdf
    • https://static.s123-cdn-static.com/uploads/4446784/normal_6006e2bb741a2.pdf
    • https://zobupasig.weebly.com/uploads/1/3/1/4/131438120/raneran_vukasazer.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/fapaga/vmware_vsphere_essentials_plus_kit_installation_guide.pdf
    • https://s3.amazonaws.com/tumuzu/hp_printer_web_services_could_not_be_enabled.pdf
    • https://s3.amazonaws.com/dazinibonofobi/airdroid_apk_full_espaol.pdf
    • https://uploads.strikinglycdn.com/files/eeb4ec1e-1537-4a6f-9339-58303fb9599e/10573641854.pdf
    • https://uploads.strikinglycdn.com/files/2cb9fec6-e6cf-40ec-9716-3ca71722afaf/mod_load_order_skyrim_se_ps4.pdf
    • https://uploads.strikinglycdn.com/files/fa5da100-7dae-4fea-a717-bd48bf85ee09/fixaratazuzobugofupi.pdf
    • https://s3.amazonaws.com/pobixedele/sewuxadinusibotavemosip.pdf
    • https://s3.amazonaws.com/wixamupelinere/blank_word_document_business_card_template.pdf
    • https://s3.amazonaws.com/bewibiwat/91807024835.pdf
    • https://s3.amazonaws.com/wulotugadag/xebivojojurum.pdf
    • https://s3.amazonaws.com/vofadoloves/python_regex_snake_case_to_camel_case.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fe92.bin
b01ec9b11f46524e255635e276fc5aceee6308171577b298e98bbdc8741431db
pdf-font-stream PDF embedded font (sfnt) at offset 0xFE92 5524 bytes
font_01_sfnt_off00011149.bin
d60c720fbdc6b4817011664a393dcf98aa77881a4b6abffd6d234b93197e83a7
pdf-font-stream PDF embedded font (sfnt) at offset 0x11149 11904 bytes
font_02_sfnt_off00013846.bin
975089639afea594160f6daa1ae948ffc4125994d61a9fd32dce02580f7b6b15
pdf-font-stream PDF embedded font (sfnt) at offset 0x13846 16312 bytes