Malicious PDF — malware analysis report

Static analysis result for SHA-256 50d4906bda42f2bd…

MALICIOUS

PDF

79.4 KB Created: 2021-03-15 15:12:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: ac034e1870c00f31744c678c90f5ce89 SHA-1: ce8380ada15d4aa1cd2fe49e85c8029270aa4ea8 SHA-256: 50d4906bda42f2bd37084a88741d8a06dfcf356c318d71922d7b90d1afb5d5e4
246 Risk Score

Malware Insights

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

This PDF file is identified as malicious due to its structure and embedded content, which includes a link farm designed to redirect users to potentially harmful content. The heuristic 'SE_BRAND_CREDENTIAL_PHISH' indicates a credential phishing lure impersonating the 'Target' brand, directing users to a redirector URL. The presence of numerous external links, many hosted on disposable domains, further supports the phishing and malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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.
  • Brand-impersonation credential phishing lure critical SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: action link to abused redirector https://kedixusivazusug.weebly.com/uploads/1/3/4/8/134869684/boxunula.pdf.
  • 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://leonvi.ru/wix?keyword=clash+of+clans+unlimited+gems+hack+apk+download PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4468550/normal_5fd29fd1aa51f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496571/normal_5fd98b711959c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500893/normal_5fe856e3e8528.pdfIn PDF document text
    • https://kedixusivazusug.weebly.com/uploads/1/3/4/8/134869684/boxunula.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380228/normal_600bb3de72ade.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376601/normal_603e0008a1373.pdfIn PDF document text
    • https://mivagadak.weebly.com/uploads/1/3/4/5/134599435/puxaxego-sozoxufujex-najubad-gefuroruso.pdfIn PDF document text
    • https://sejomuxajifaged.weebly.com/uploads/1/3/1/4/131437693/jedibabavexe_jafatamivupore.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408355/normal_601b08c373e64.pdfIn PDF document text
    • http://tevojagi.iblogger.org/61305377250.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485321/normal_603184e09dea2.pdfIn PDF document text
    • https://vamekatowozi.weebly.com/uploads/1/3/0/8/130814347/1510283.pdfIn PDF document text
    • https://jidupedepinamup.weebly.com/uploads/1/3/2/6/132680921/7951307.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/054bf68f-5a66-4749-bb08-39d7e48cc49d/fizavesodolimubipise.pdfIn PDF document text
    • https://s3.amazonaws.com/waduzirader/luwusigovatevivaruwuwape.pdfIn PDF document text
    • http://zofunumuwade.rf.gd/9482807177.pdfIn PDF document text
    • https://s3.amazonaws.com/najubu/gatexudin.pdfIn PDF document text
    • https://s3.amazonaws.com/selivuvumepaveb/jeu_de_cartes_in_english.pdfIn PDF document text
    • https://s3.amazonaws.com/tevomenil/what_to_do_if_cronbach_alpha_is_negative.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7d66c642-d9e9-47a2-b7bf-3bf944d135b8/katawa_shoujo_route_map.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_off0000f8c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8C4 5532 bytes
SHA-256: ab3a6fa79e84b394f3fb6afc3e3173b997a86c7c227443883e0d34a600817b0b
font_01_sfnt_off00010b86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B86 10724 bytes
SHA-256: 1c75fd23fc0a3e44e4bfe81e754f4e5dc1916db6a5cc7a53991818f02314caa6