Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a148f71a6a54bad…

MALICIOUS

PDF

75.5 KB Created: 2021-05-16 07:44:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: b9a1ea779fabf46f32da0d839c26be1e SHA-1: 35fd19c1c576b8d5bb56f960b62446bfac6f671f SHA-256: 1a148f71a6a54bad4a4feeb133bbcf22be10cf334aa5b3ebfe021f330cb3357d
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, identified as a 'PDF_SEO_LINK_FARM' heuristic. Several of these links point to suspicious domains and are likely intended to redirect users to malicious content or phishing sites. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://kuzutuzo.ru/strik?utm_term=how+to+arrange+in+descending+order+in+excel+pivot+table PDF link annotation
    • http://ses-sanobrabotka.ru/curriculum_guide_in_mapeh_20197v1v4.pdfIn PDF document text
    • http://ita-bio.fun/stephen_hawking_young_interviewjezkd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458428/normal_601146c7bbf9b.pdfIn PDF document text
    • http://salopkisa.website/niwabuwutomofuxh0hl.pdfIn PDF document text
    • http://domavera.ru/401308316231t2bi.pdfIn PDF document text
    • http://indir-kazan.com/74642142136a3da.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4460708/normal_6009945fdb4ff.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/ditiruz/best_guided_meditation_apps_2019.pdfIn PDF document text
    • https://s3.amazonaws.com/fotepopunaj/moto_x_2nd_generation_case.pdfIn PDF document text
    • https://s3.amazonaws.com/tugumeb/59786296669.pdfIn PDF document text
    • https://s3.amazonaws.com/rimejiguvif/xuvonalir.pdfIn PDF document text
    • https://s3.amazonaws.com/polojuliragam/antropologia_livros.pdfIn PDF document text
    • https://s3.amazonaws.com/dazifozixawus/99465033727.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/edd91785-d1e7-49e3-b510-c14cd1e520ea/91544853689.pdfIn PDF document text
    • https://b64dd490-e5b9-492f-89ff-e398ecee904c.filesusr.com/ugd/5926b4_21f449a87711459c973cf20742558cb4.pdf?index=trueIn PDF document text
    • https://d321836a-1bf8-47c4-b4d3-67fe1e7f0250.filesusr.com/ugd/33ab24_d7232cd6fb1242ceacf835804ce9a87f.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/fc123371-9d86-446d-8c81-4dc50b362ef3/what_tests_are_optional_during_pregnancy.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_off0000e5c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5C2 5564 bytes
SHA-256: a390ff9d79dbb280c82eb6e7b10064e782bd04f61232b8937cca87227c4eb10e
font_01_sfnt_off0000f8d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8D0 11072 bytes
SHA-256: 6c2c4ae71553788cc1054c852fa7bc58eafe27ffe79ab3827ac75986b5fa2d10

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