Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa40a81c28b09e23…

MALICIOUS

PDF

73.1 KB Created: 2021-03-03 00:25:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-04
MD5: 9b457f9ab7f1b581e4fd37093f6fb190 SHA-1: 6f22b4b66536316f5b81c18c242333aea3e20125 SHA-256: aa40a81c28b09e238bc3f111049dd14ac88cdca87409756f07af47421cf8da6e
196 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://seumenha.ru/award?keyword=what+does+an+occupational+psychologist+do PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4368218/normal_5fe1ecf3d8996.pdfIn PDF document text
    • http://clipshd.design/354760689124di7d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4480595/normal_5fe10f5c627b9.pdfIn PDF document text
    • https://sigiduba.weebly.com/uploads/1/3/1/3/131384121/3257544.pdfIn PDF document text
    • https://levalezekavazif.weebly.com/uploads/1/3/4/6/134639406/netupivusisu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388163/normal_5ff19c1e907b3.pdfIn PDF document text
    • https://nogonosexenepe.weebly.com/uploads/1/3/4/6/134674491/wevazoxaw-sewarewujewofim.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391024/normal_603b59d78dd86.pdfIn PDF document text
    • https://butevexonukuzi.weebly.com/uploads/1/3/2/6/132681970/d50fff17db9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4464870/normal_5ff6831e85f2b.pdfIn PDF document text
    • https://wukarogokemek.weebly.com/uploads/1/3/0/7/130739107/pidomo_nujutapuw_sobibanajajife_disava.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453764/normal_603141415f7bd.pdfIn PDF document text
    • https://xufujakuzizam.weebly.com/uploads/1/3/5/3/135315974/45aed.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495254/normal_600dfbea4d42c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4452839/normal_5fe5530dc07b6.pdfIn PDF document text
    • http://pedagaro.22web.org/ejercicios_para_angina_de_pecho.pdfIn PDF document text
    • https://desotidibig.weebly.com/uploads/1/3/0/7/130775813/lapoluko.pdfIn PDF document text
    • https://berekimitavogi.weebly.com/uploads/1/3/1/4/131452750/7204113.pdfIn PDF document text
    • https://fexaxotira.weebly.com/uploads/1/3/5/4/135401388/3a58d5.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nujowizuwumug.rf.gd/20106468054.pdfIn PDF document text
    • http://sawelisibov.rf.gd/platicas_de_seguridad_para_mina_subterranea.pdfIn PDF document text
    • 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e094.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE094 5352 bytes
SHA-256: c685091b659a4420515c02534543194ab4a164377db66f8ff9eb2ba1eb7cc084
font_01_sfnt_off0000f2e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2E4 10624 bytes
SHA-256: 3bd3e844d834337b9610b38cf2a7b517f9e232d1565fd113a1a68a43b692791a