Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe708daf4dc8da13…

MALICIOUS

PDF

72.9 KB Created: 2021-06-06 03:07:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: e43bdcf6f9f7503da001eda7cbdb821a SHA-1: 5ff09f6bfe91ad9d62061ca289914ad12a84e019 SHA-256: fe708daf4dc8da131c227f63e9524c9e48028d9d745db550e21fff6ebbaac122
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier. It contains a large number of external links, many pointing to disposable domains, suggesting a link farm or SEO manipulation tactic. One embedded URI, 'https://crysiq.ru/pbw?utm_term=java.net.socketexception+connection+or+outbound+has+closed', is also present, potentially leading to further malicious content or phishing attempts. No scripts were extracted, but the overall structure and link farm behavior are indicative of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://crysiq.ru/pbw?utm_term=java.net.socketexception+connection+or+outbound+has+closed PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4490523/normal_601d4b398d946.pdfIn PDF document text
    • https://lutowixo.weebly.com/uploads/1/3/4/7/134705225/sagumikavuro.pdfIn PDF document text
    • https://bezujaseda.weebly.com/uploads/1/3/1/4/131437953/c48058bea83b1f0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421360/normal_60282ec0a298b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387411/normal_606e137257f12.pdfIn PDF document text
    • https://jafufikatovovew.weebly.com/uploads/1/3/4/4/134481731/5209849.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489977/normal_602d48bb0c210.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379742/normal_6021ba0659212.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4448347/normal_5fca738f4ada5.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4488141/normal_60aff390c1e9f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4473053/normal_5ff26049e0c4b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408583/normal_603d03679fa56.pdfIn PDF document text
    • https://pujuwofox.weebly.com/uploads/1/3/4/8/134882524/lapirowu-xufajazoku-kenuzidi-nurulonosejiw.pdfIn PDF document text
    • https://nekekijubexofus.weebly.com/uploads/1/3/4/5/134587401/dowop.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413012/normal_6008ed6cb7efd.pdfIn PDF document text
    • https://xuvamedinomu.weebly.com/uploads/1/3/5/3/135392700/piravilejejurisutak.pdfIn PDF document text
    • https://gijidibeb.weebly.com/uploads/1/3/4/7/134702067/8291614.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375358/normal_5ff55a63a1426.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469359/normal_604a7716341d5.pdfIn PDF document text
    • https://wepusetu.weebly.com/uploads/1/3/2/6/132695333/708ad3b2fc02277.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4456387/normal_5fe258e1e70df.pdfIn PDF document text
    • https://gatuxarujesij.weebly.com/uploads/1/3/5/2/135296766/bawidonod-gejutevu-jimunefegomekid-veneduxipepa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416928/normal_6051a0f723a7c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4365998/normal_5fc8740f4a936.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000dd21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD21 5512 bytes
SHA-256: 89d1b2ab2a2feb2afbed84b7adf20618b8eeae4b6303a02c2492ea3091c49ed1
font_01_sfnt_off0000efe6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFE6 10980 bytes
SHA-256: 3d515b436a2f45617fa6ff74150b7eed4ad47b270c0767f5dcf52877eee1ec45