Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f26aa95d01b65ed…

MALICIOUS

PDF

84.3 KB Created: 2021-05-17 19:05:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: ed54b58639c900262cf1c5390e694294 SHA-1: ce1843f064e93d70b160a479ab9562681884b893 SHA-256: 4f26aa95d01b65edbdf7cabb9097761660d15b2e5f9b1c13b798a5f11525dcc0
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, exhibiting characteristics of a link farm. It contains numerous external URIs, many pointing to disposable hosting services, suggesting an attempt to distribute malicious content or conduct phishing. The presence of multiple external links and the PDF_SEO_LINK_FARM heuristic indicate a high likelihood of this document being used to redirect users to harmful sites.

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://dugedepap.ru/strik?utm_term=portosystemic+shunt+cat PDF link annotation
    • https://xaxafojub.weebly.com/uploads/1/3/0/7/130738676/9504466.pdfIn PDF document text
    • https://dotofufodil.weebly.com/uploads/1/3/5/3/135313806/woxaruwomusukix-vorobumi-votexitufujuwu.pdfIn PDF document text
    • https://gukepofefefika.weebly.com/uploads/1/3/1/4/131437977/7101486.pdfIn PDF document text
    • https://kufaxalerix.weebly.com/uploads/1/3/1/4/131453821/jawuvidojitosol.pdfIn PDF document text
    • https://didukomam.weebly.com/uploads/1/3/1/8/131857465/zujagokaragutixubab.pdfIn PDF document text
    • http://kodepovorivapi.mygamesonline.org/vuwoxeloxixusivoziw.pdfIn PDF document text
    • https://feroredo.weebly.com/uploads/1/3/1/3/131379294/3b516ed6a4b.pdfIn PDF document text
    • https://nexitikobimefa.weebly.com/uploads/1/3/0/7/130776699/5483298.pdfIn PDF document text
    • http://rejorevubirobu.sportsontheweb.net/ledegifevovunemikeka.pdfIn PDF document text
    • https://zelapagetuwuj.weebly.com/uploads/1/3/1/4/131406140/niratipobipu_tidamaf.pdfIn PDF document text
    • https://nesibebinirudeb.weebly.com/uploads/1/3/5/3/135311353/8491309.pdfIn PDF document text
    • http://navevukosuso.mypressonline.com/74025110586.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/xafaxotaful/mystic_messenger_v_route_email_guide.pdfIn PDF document text
    • http://romakilax.myartsonline.com/accurate_ring_size_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/jobavo/sol_marksheet_ba_programme.pdfIn PDF document text
    • http://zodofujeki.atwebpages.com/adding_decimals_word_problems_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/bupesejirijejus/windows_echo_username_not_working.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_off000108ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108AE 5108 bytes
SHA-256: 0523d46bd8ca9da1fc8fc7feb38e12d5aee86f1112c659f9ddc0d0f917841e12
font_01_sfnt_off000119e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119E8 12564 bytes
SHA-256: ed3865f6bc76addb518a30d2cea035db9502496edbcadf90a02cc454c578d981

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