Malicious PDF — malware analysis report

Static analysis result for SHA-256 bddfdb38d8484d5f…

MALICIOUS

PDF

66.0 KB Created: 2021-02-27 11:18:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 7f754a9730fa3b21d203480ca28fe38d SHA-1: 5663fa84b6dd899de39912388d16b75cdfd970f8 SHA-256: bddfdb38d8484d5f84cbe16d4174e32c05d45ac89b929dd151b6c64b9eac8600
156 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for a 'PDF_SEO_LINK_FARM' which indicates a large number of external links, with one prominent URL pointing to 'resalured.ru'. ClamAV also detected this as 'Pdf.Phishing.Trojan'. The presence of numerous external links suggests an attempt to direct users to malicious content or phishing sites, aligning with a spearphishing attachment attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://resalured.ru/strik?utm_term=persuasion+in+the+media+age+3rd+edition+%25282013%2529+by+timothy+a.+borchers PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4402517/normal_602e70716d779.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366340/normal_5fe3dd3d24348.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451225/normal_600ae9d175b12.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388629/normal_602d314f508d1.pdfIn PDF document text
    • https://cdn.sqhk.co/zubavagi/jeidNgB/99707811281.pdfIn PDF document text
    • https://murunabijijot.weebly.com/uploads/1/3/5/4/135401069/0026be.pdfIn PDF document text
    • http://fojalalut.22web.org/dd_5th_edition_players_guide.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/xonobijikivo/aligarh_movie_worldfree4u.pdfIn PDF document text
    • https://s3.amazonaws.com/lonozote/cabinet_drawer_hardware_installation_template.pdfIn PDF document text
    • http://nipufafinera.epizy.com/55177907469.pdfIn PDF document text
    • https://s3.amazonaws.com/woberiz/free_curriculum_vitae_template_for_teachers.pdfIn PDF document text
    • https://s3.amazonaws.com/zuxime/18295251708.pdfIn PDF document text
    • http://robexekipojop.rf.gd/bridgeton_public_schools_salary_guide_2017.pdfIn PDF document text
    • http://jatuxijor.epizy.com/14336002890.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_off0000c330.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC330 6240 bytes
SHA-256: 56e8e9a2fa28d3fb3444b01ca5902f6e25c1dd743690ce204228fff76d3817e4
font_01_sfnt_off0000d85f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD85F 9968 bytes
SHA-256: 564707ed42011ceec71c26d064333166574622abaa11e1877d2d4c6aad85dcae

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