Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c42e56a34cf7ec4…

MALICIOUS

PDF

80.3 KB Created: 2021-03-10 14:39:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 27ee6e0288c461207ab88720042dfebe SHA-1: 183f086e42c55f787cb999a01621ccfce68eb063 SHA-256: 5c42e56a34cf7ec4900c64e158d4c885d2e2ff3f3dc49c733bd7d4bfee58c65d
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many pointing to disposable domains, suggesting it's part of a link farm or phishing operation. The presence of numerous PDF links and the use of disposable hosting are strong indicators of malicious activity, likely aimed at SEO manipulation or distributing further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://mezovuduw.ru/123?utm_term=lord+hanuman+songs++in+telugu PDF link annotation
    • http://ayazshabutdinov.club/arterite_de_clulas_gigantes6wntf.pdfIn PDF document text
    • http://quickpapp.online/43093239696dt48g.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406166/normal_603edab7ae5b1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4428043/normal_5ff1829ec0e06.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384037/normal_604033d071a30.pdfIn PDF document text
    • http://rezumitisud.mygamesonline.org/assignment_abroad_times_epaper_mumbai_download.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418184/normal_600a9e5377604.pdfIn PDF document text
    • https://cdn.sqhk.co/tefazaturar/bgfighf/9678194058.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4492245/normal_603a7be042b63.pdfIn PDF document text
    • http://milesnires.xyz/43358699495i2i71.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384320/normal_600515afd7a0f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4499300/normal_5ffc87499162e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480387/normal_5fd2ca00a08ed.pdfIn PDF document text
    • http://zujejilolo.scienceontheweb.net/24323102480.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4492250/normal_60473f6ec44bb.pdfIn PDF document text
    • https://cdn.sqhk.co/tazifawixax/hcVgihd/lizifovisutimu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://e1eccfe9-8888-4f52-a155-e9c8e84e0752.filesusr.com/ugd/4fb05f_68a16268c6f040dcbc01d127e94b447e.pdf?index=trueIn PDF document text
    • https://c8070bf9-ed42-4c5d-8eb8-ca35ee70f136.filesusr.com/ugd/d38238_4d332b39952743a1b749a38796bb8d75.pdf?index=trueIn PDF document text
    • https://8a89c5bc-485b-4808-980c-66c60e8d9908.filesusr.com/ugd/834936_401a215e5f5a4a3a8682b439395aaa3f.pdf?index=trueIn 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF7A 5060 bytes
SHA-256: d62eb7a7cb2589896e98b4290c01601a645b8937f51090cca2ff71bd70315f81
font_01_sfnt_off0001007c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1007C 11216 bytes
SHA-256: d3590002bfc3c0d50c49e2b68c0cf4cc7edc8781b0d1855909327d7ab40856fe
font_02_sfnt_off000125d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125D2 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3