Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5a9f8815ef00961…

MALICIOUS

PDF

69.8 KB Created: 2021-04-03 07:51:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: efd3f7855d018a0bf97490246c34d254 SHA-1: 2ab6e96e937d622ee2baa3fac27d7d977f87e5db SHA-256: c5a9f8815ef0096179a74a6305c9243c498a71a33ac36f49be3d2a9118bb3d61
186 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for a phishing trojan. It contains a large number of external links, indicating a link farm designed to redirect users to other sites. The ML classifier also strongly indicated maliciousness. While no scripts were explicitly extracted, the PDF structure and URL patterns suggest it is part of a phishing or SEO manipulation campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://nipisod.ru/wix?keyword=answer+quick+questions PDF link annotation
    • http://vawurabel.mygamesonline.org/dafagogemekudunepunuvelan.pdfIn PDF document text
    • https://wotigutaz.weebly.com/uploads/1/3/4/3/134361511/422c94826b6f8b4.pdfIn PDF document text
    • https://muwudenejudazo.weebly.com/uploads/1/3/4/6/134677543/7478743.pdfIn PDF document text
    • http://bedebatosisazov.22web.org/62994363773.pdfIn PDF document text
    • http://fewudutizoxom.medianewsonline.com/82039848162.pdfIn PDF document text
    • https://xofanasafavusov.weebly.com/uploads/1/3/4/3/134399160/dasagawunow.pdfIn PDF document text
    • http://xemizawufogutuf.scienceontheweb.net/supuzataxabigudulade.pdfIn PDF document text
    • http://pixidilivutep.medianewsonline.com/rikikuxemefemezobo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kutugujipix.epizy.com/92380674368.pdfIn PDF document text
    • http://ronojegev.rf.gd/surat_al_kahfi_download.pdfIn PDF document text
    • https://43a2ba88-5de9-465b-b95f-6a4d82f2d06e.filesusr.com/ugd/dcbeda_94a1c7831c144f73b582007a2fca12a9.pdf?index=trueIn PDF document text
    • https://fe2b84af-b373-48e0-a714-f820169e3fe9.filesusr.com/ugd/ed1d2e_2decbfcd687047b78b5860bb7d010657.pdf?index=trueIn PDF document text
    • http://bupixifebinare.epizy.com/mapatojeludewupivu.pdfIn PDF document text
    • http://fipejawopali.epizy.com/chandra_prakashan_assam_tet_book_2020.pdfIn PDF document text
    • http://doguzikeva.epizy.com/why_does_my_emergency_alert_keep_going_off.pdfIn PDF document text
    • http://sakikuzugodo.rf.gd/how_to_know_if_a_pimple_is_skin_cancer.pdfIn PDF document text
    • http://bidexegope.epizy.com/mazezugepaxuwukolosur.pdfIn PDF document text
    • https://21a67f6d-2aea-439f-a910-ed4feb6be009.filesusr.com/ugd/173616_8b35007cc71344f6a88ec1f47ca34fac.pdf?index=trueIn PDF document text
    • http://jebufipip.epizy.com/ripugorefidawogerufa.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d674.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD674 4824 bytes
SHA-256: 49a8656385f66f2f18fea7bb78e0e05734e00d1f08d9a710e3408c5236fdb9a7
font_01_sfnt_off0000e70a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE70A 10432 bytes
SHA-256: 7b8cbe44f9ff6afbdc4f67ccece7f9ccb48e56dae7d1d8af026cd38ee7e08dbf

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