Malicious PDF — malware analysis report

Static analysis result for SHA-256 40bb6a3e90cc0ff2…

MALICIOUS

PDF

88.4 KB Created: 2021-06-10 18:53:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: ac618a80d4a8c06968d8a8440d2039ab SHA-1: a94c010decce9e6833282f3303a60c804cc34ee9 SHA-256: 40bb6a3e90cc0ff2ae9e8760ea9655fdb98eb18412d27997ba4ec72733f4fe1c
186 Risk Score

Malware Insights

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

The PDF document contains a link farm designed to redirect users to various download sites, masquerading as search results for popular content. The presence of multiple external URIs and the ML classifier's high confidence score indicate malicious intent. While no scripts were directly extracted, the PDF structure and embedded URLs suggest it's part of a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • 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.
  • 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://allytemp.ru/pbw?utm_term=hack+apk+beach+buggy+racing+2 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4408712/normal_604aa69686e6e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467017/normal_602f7c56bd7e4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451047/normal_6005419883b61.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4411001/normal_5fd095e19a1e6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463287/normal_6016edaa9d2a0.pdfIn PDF document text
    • https://sudivepa.weebly.com/uploads/1/3/5/3/135315425/jovujoxobo-musozele-mowabixuv-vodawavog.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411700/normal_6062e9419f9c0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371025/normal_605db6b578cb3.pdfIn PDF document text
    • https://dotofufodil.weebly.com/uploads/1/3/5/3/135313806/vadebisajax.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485157/normal_5fee068876521.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470828/normal_601cd1d2d53a4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4447258/normal_6006274fe9f29.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sujagajo.pbworks.com/f/ice_age_collision_course_full_movie_download_in_hindi_1080p.pdfIn PDF document text
    • http://menovokosi.pbworks.com/w/file/fetch/145020798/barcode_generator_online_free_download.pdfIn PDF document text
    • http://wenitudodub.pbworks.com/f/60239669513.pdfIn PDF document text
    • http://vawaguzidatu.pbworks.com/f/73626637765.pdfIn PDF document text
    • http://xedidovetaw.pbworks.com/f/fiche_fraction_cm1.pdfIn PDF document text
    • http://furalagaposu.pbworks.com/f/luwugobetomutelamebemava.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
    • 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_off0000ee6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE6E 4396 bytes
SHA-256: 989860152aa6188e9b766ad7b587f2d65ddd36ab1d6fda3a7fe3df040ccd681b
font_01_sfnt_off0000fddb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDDB 5384 bytes
SHA-256: caed3a8760613930722bd7a007eb1821e57867fdd01bd563d5dd7dabc85194c7
font_02_sfnt_off0001102e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1102E 16688 bytes
SHA-256: ddf180b6a72200b1228409693e0074253b3cbc66d1f711bfb889d2e9da78d666
font_03_sfnt_off00013bd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BD7 16428 bytes
SHA-256: 2101bab9782cfab1096acc0977a555af7a51c1e6bad01778ac629fbcd7dc6109