Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ee4c3d0f23d4c3c…

MALICIOUS

PDF

88.9 KB Created: 2021-04-04 19:09:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: fa89fc33f0a2d62d3e991100ab397143 SHA-1: 13bf233ab40fbea09598269055a81a7a86283c24 SHA-256: 4ee4c3d0f23d4c3c5db7dbc3f2607531d23cd4608a86e539d45efa80eba24f61
156 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, identified as a link farm, suggesting a malicious intent to redirect users to potentially harmful websites. The ML classifier and ClamAV detection strongly indicate malicious content. While no scripts were explicitly extracted, the presence of embedded URLs and the heuristic findings point towards a phishing or SEO manipulation attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • 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/award?keyword=formation+windev+mobile+pdf PDF link annotation
    • http://vefavirona.22web.org/cm_awas_yojana_mp_form.pdfIn PDF document text
    • http://femetorisufi.sportsontheweb.net/24133105010.pdfIn PDF document text
    • https://fukuzodi.weebly.com/uploads/1/3/5/3/135329923/6800763.pdfIn PDF document text
    • https://fojiwuduz.weebly.com/uploads/1/3/5/3/135309278/kokejizam-dijomo.pdfIn PDF document text
    • https://nujalujuxak.weebly.com/uploads/1/3/5/3/135347358/b54db6e52ccf537.pdfIn PDF document text
    • https://dakusarifupufa.weebly.com/uploads/1/3/3/9/133997242/9503630.pdfIn PDF document text
    • http://mumolazesinidix.getenjoyment.net/artistry_studio_paris.pdfIn PDF document text
    • https://wiwofuda.weebly.com/uploads/1/3/2/3/132303082/21010c5534.pdfIn PDF document text
    • https://wenuzivubog.weebly.com/uploads/1/3/5/3/135392435/gotolovubez.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/daniwodug/54054725293.pdfIn PDF document text
    • https://s3.amazonaws.com/dutimajizowa/56378370726.pdfIn PDF document text
    • https://0dd0cd87-80d3-4eb5-b9c6-73c43c3a6fca.filesusr.com/ugd/f0b6b3_91ab0d0ea3dd4e7e921744ff08b4658f.pdf?index=trueIn PDF document text
    • http://vafotuneg.rf.gd/contractor_s_affidavit_template.pdfIn PDF document text
    • http://bikutuvuxaxixo.epizy.com/fenupotogizudo.pdfIn PDF document text
    • https://s3.amazonaws.com/wamatasamegu/vexevinedurakuwujabuxalu.pdfIn PDF document text
    • https://804b95bc-9ca4-448d-a094-5a8e1ff69a26.filesusr.com/ugd/99d1da_2b82e5ee7b2e4a638d4201efb5f2b4a0.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jevedijadiki/is_korean_a_hard_language_to_learn.pdfIn PDF document text
    • http://xolavozezimodan.onlinewebshop.net/relation_between_gdp_and_national_income.pdfIn PDF document text
    • https://s3.amazonaws.com/tobobowu/mejizobifomu.pdfIn PDF document text
    • https://add83a7c-0e31-48b3-928b-061d82ba9144.filesusr.com/ugd/205ae4_181cd6086a3442fda7ff771389f45109.pdf?index=trueIn PDF document text
    • https://01d67eed-50ba-4ccb-8f82-c1581f7ed07e.filesusr.com/ugd/e3325f_acff24f0c1d842c2aef9f529fda80a54.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000118e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118E0 5256 bytes
SHA-256: 57e59fc6694552ed9a9e2a5646609a6b2fade1793188ae7edcc3b7b2420ee11f
font_01_sfnt_off00012abd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12ABD 13420 bytes
SHA-256: 173afbe5ccad51965bb8dd2256fa446a154afa8e620602492c02346981b5dbc2

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