Malicious PDF — malware analysis report

Static analysis result for SHA-256 9dc2b43164a62482…

MALICIOUS

PDF

67.4 KB Created: 2021-01-12 03:21:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-29
MD5: bf3a6d2efe469aa76e2bd7e86bb3e82a SHA-1: c14c9f36910d39bad6c142905a9e45a950ad75c2 SHA-256: 9dc2b43164a62482e4b3eafafee4a786a716159b162233498aa4475a6b88f469
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, many pointing to S3 buckets and other domains, suggesting a link farm or redirection mechanism. The heuristic PDF_SEO_LINK_FARM indicates a mass of external PDF links, with one prominent example being a link to a PDF hosted on s3.amazonaws.com. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external links suggest it's designed to redirect users to malicious content.

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://traffine.ru/123?utm_term=the+eyes+of+nye+human+population+worksheet+answer+key PDF link annotation
    • https://cdn.sqhk.co/bovokolel/8PjeLFN/deriwusigonipurigegozepe.pdfIn PDF document text
    • https://cdn.sqhk.co/bulixanejad/iIArigU/lixidorilanu.pdfIn PDF document text
    • https://site-1173522.mozfiles.com/files/1173522/lions_questions_and_answers.pdfIn PDF document text
    • https://kuvomudoriri.weebly.com/uploads/1/3/1/4/131406544/0a56036a393442c.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/xonaxevetaf/sokinurozilufaxapeda.pdfIn PDF document text
    • https://s3.amazonaws.com/baposivarabuj/niluw.pdfIn PDF document text
    • https://s3.amazonaws.com/wufujudisu/craftbukkit_1._12._2_jar.pdfIn PDF document text
    • https://s3.amazonaws.com/roxawo/alien_vs_predator_2004_sinhala_subtitles.pdfIn PDF document text
    • https://s3.amazonaws.com/supefujoxopubu/make_excel_sheet_print_full_page.pdfIn PDF document text
    • https://s3.amazonaws.com/serogajugomiji/75809699199.pdfIn PDF document text
    • https://s3.amazonaws.com/vapelurowar/nexetidijiwewazimajatite.pdfIn PDF document text
    • https://s3.amazonaws.com/jojitagifuva/mayhem_gun_2.pdfIn PDF document text
    • https://s3.amazonaws.com/xojafemori/bandwagon_fan_transfer_form.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_off0000c9fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9FE 5348 bytes
SHA-256: 9f11ea13bc7f57df051c664b25e635ec3881866243d128b8a3c3b9cd1823a99d
font_01_sfnt_off0000dc19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC19 10736 bytes
SHA-256: 5ea599d9c426eac58e7c18a6b14c04e4c415b23c89a4f47628f54804e69ee618

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