Malicious PDF — malware analysis report

Static analysis result for SHA-256 842c7e080bf36a46…

MALICIOUS

PDF

70.3 KB Created: 2021-06-10 00:13:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: ed4ea0a635176d1bffcd278b7efad430 SHA-1: c76e2ee52bb4e8c2421f6381f48963452430392b SHA-256: 842c7e080bf36a46f2e96ef46cbf8a19bdb2a5fdd57d2f6b2819b1714432f199
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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.
  • 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://smidgel.ru/pbw?utm_term=lab+activity+relative+dating PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4371812/normal_5ff0626f3c0f7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385435/normal_60371387df864.pdfIn PDF document text
    • https://gexeperi.weebly.com/uploads/1/3/4/3/134348656/03459b3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485800/normal_5fe7b566e697c.pdfIn PDF document text
    • https://memuwumobodedo.weebly.com/uploads/1/3/5/9/135974490/663f250d23ea.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477913/normal_6020bb03592d6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409628/normal_601610cc5284f.pdfIn PDF document text
    • https://wasoxojeroxinab.weebly.com/uploads/1/3/4/8/134888233/nakuloxama_wutujavuxa.pdfIn PDF document text
    • https://natugivekoxatan.weebly.com/uploads/1/3/1/3/131380011/limatepe-kugukapuz-baxaketixuziwu.pdfIn PDF document text
    • https://duwesokele.weebly.com/uploads/1/3/1/6/131606866/7901175.pdfIn PDF document text
    • https://pamibatofenowa.weebly.com/uploads/1/3/4/5/134525539/fd9ecf573.pdfIn PDF document text
    • https://jiditejebata.weebly.com/uploads/1/3/5/3/135305220/fuvamolafuzek.pdfIn PDF document text
    • https://dizugupixaxagoj.weebly.com/uploads/1/3/4/4/134440249/8407954.pdfIn PDF document text
    • https://laratenin.weebly.com/uploads/1/3/2/8/132816160/e8a07c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/89f16c9c-d852-4bf9-ab71-dee7d923d43b/data_mining_techniques_and_applications_an_introduction.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d0829827-fadb-40ac-9dca-c8b9ca9f92dc/pretty_little_liars_the_perfectionists_enter_the_professor_recap.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/caef2a8f-a081-4864-b34b-f915e91a52cd/8719457973.pdfIn PDF document text
    • http://vikowezanipe.pbworks.com/f/que_es_el_sistema_circulatorio_funcion.pdfIn PDF document text
    • http://gibabug.pbworks.com/f/38841378153.pdfIn PDF document text
    • http://fudejob.pbworks.com/f/what_is_the_learner_centered_approach.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2f7dd7ed-fe1d-4e74-b418-68a1a6d3e455/catch_me_if_you_can_trailer_youtube.pdfIn PDF document text
    • http://mukonisu.pbworks.com/f/xamafuz.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_off0000d7ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7CE 5172 bytes
SHA-256: ebb9747297466c1992039dbcbc2a5e9e42a9358f3fa0ba8ed0eb0441f09893c3
font_01_sfnt_off0000e986.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE986 10136 bytes
SHA-256: d248504e384e58c416181155f61b9745fb3596250c7243629a28d44ebc5a50bd