Malicious PDF — malware analysis report

Static analysis result for SHA-256 4907de6190af9f55…

MALICIOUS

PDF

81.2 KB Created: 2021-04-11 19:09:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e80294c65647d54f0c734b314b3662e4 SHA-1: d38017b88055eb3f0035e5a5f1906957267977db SHA-256: 4907de6190af9f556417e54b3dac460157f473aac98a8680a8a29a5b300e85d1
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm or SEO spam operation. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external URIs are indicative of techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 6

  • 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
  • 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://dafemum.ru/strik?utm_term=feliz+navidad+lyrics+spanish+only
    • https://sifukimoja.weebly.com/uploads/1/3/4/3/134357082/vulabovozovov_tarusaramirovu_farujusetebuj_fofod.pdf
    • https://teditiwos.weebly.com/uploads/1/3/2/6/132681477/6704630.pdf
    • https://cdn.sqhk.co/nisugavu/V3sUid8/dilanewi.pdf
    • https://waguxezemi.weebly.com/uploads/1/3/4/7/134703223/luzukivegatibom-gilotorara-vurovuwijewur-waratar.pdf
    • https://cdn.sqhk.co/febutatesu/hjhbgia/nitipumonusoxowuxanar.pdf
    • https://cdn.sqhk.co/watexoba/fjfhbhe/bounce_that_bird_free_arcade_platform_games.pdf
    • https://cdn-cms.f-static.net/uploads/4392457/normal_600ffcab4c7e7.pdf
    • https://cdn.sqhk.co/sisowufabo/gnYEI5y/8_ball_pool_online_unblocked.pdf
    • https://vadutebo.weebly.com/uploads/1/3/4/8/134889136/9733016.pdf
    • https://cdn-cms.f-static.net/uploads/4447464/normal_603f0c709fa6b.pdf
    • http://xsafak.com/after_imdb_parents_guideiezw5.pdf
    • http://maturibcgj.space/tapolutilunisewilumeducroxa.pdf
    • http://helplnstagramcontact6088758.com/motherload_miniclip_androidx922f.pdf
    • http://usacreditscore.info/93536742926lnkr9.pdf
    • https://cdn-cms.f-static.net/uploads/4367631/normal_5fd26240526ef.pdf
    • https://cdn.sqhk.co/viwedanej/b4EH1gf/75105488267.pdf
    • https://judesofuvedal.weebly.com/uploads/1/3/1/8/131857090/repotanamuva_midonurazem_tebokokabu_genulolotej.pdf
    • https://cdn-cms.f-static.net/uploads/4412570/normal_6066d643d68ec.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/ea6e37fc-a27b-4b17-ab83-909724bde7cb/38736916581.pdf
    • https://uploads.strikinglycdn.com/files/7ddf3113-77bd-4b6a-bbcb-68f55de99c23/que_significa_la_sabiduria_en_la_biblia.pdf
    • https://234a0c07-d908-4261-bb83-16b3c96a9b04.filesusr.com/ugd/73e0e6_65adf76ef7b7405cadf1084b9762ad51.pdf?index=true
    • https://uploads.strikinglycdn.com/files/535ed6bc-1054-48db-b7f5-e56c997542a1/57911097577.pdf
    • https://229c3593-bb94-4e5d-9b9f-ca3747df48ef.filesusr.com/ugd/145364_a615cd93ad404e9db127559194c6f017.pdf?index=true
    • https://a815f367-2516-4b88-9496-eed07d5c1eb7.filesusr.com/ugd/665c20_c5bf7ccc6f964331ad9767541d96b9aa.pdf?index=true
    • https://uploads.strikinglycdn.com/files/86f91b63-9268-4710-9c4f-33d1cb201b55/28674010646.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fbd0.bin
9844ae4e18961cb6c308f6bdd39b60fe30f6d5abb1caf4a7ad3a212a85e78976
pdf-font-stream PDF embedded font (sfnt) at offset 0xFBD0 5328 bytes
font_01_sfnt_off00010e02.bin
98e52a7ea0e606de183d0ecee42a839169e12ba29c694782de3be2971bb33ffa
pdf-font-stream PDF embedded font (sfnt) at offset 0x10E02 13264 bytes