Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3a899dee7716ead…

MALICIOUS

PDF

77.7 KB Created: 2021-02-15 17:42:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: 15dabffc57cd592db006c8ab8f64e2f1 SHA-1: f3cd6c32bfdfeafd9011b2d9da4d05dab522a740 SHA-256: a3a899dee7716ead74af2f7c0d15c8763c62afa4950cc433746a6db3fe5b0c01
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, a common tactic for SEO poisoning or phishing campaigns. The embedded URL and the document body text suggest a lure related to a common search query, aiming to trick users into visiting a malicious domain. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://jottigo.ru/123?utm_term=what+does+a+green+light+on+a+fire+alarm+mean PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4458137/normal_600a71a8379d2.pdfIn PDF document text
    • https://guwemegarorara.weebly.com/uploads/1/3/4/3/134353603/438f0c9096e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4365553/normal_5fde003dbf21e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421764/normal_6009c05b39a43.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485946/normal_5fd380d9451e4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446491/normal_5ff53f6e980d5.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/tonemakopinibem/91784657890.pdfIn PDF document text
    • https://s3.amazonaws.com/safago/skiena_algorithm_design_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/gajakelegeza/62618475946.pdfIn PDF document text
    • https://s3.amazonaws.com/takebemanijewok/windows_10_1809_education_iso.pdfIn PDF document text
    • https://s3.amazonaws.com/difigomisosak/97299451011.pdfIn PDF document text
    • http://mawivevixovoxet.epizy.com/are_re_are_song_free.pdfIn PDF document text
    • https://s3.amazonaws.com/mefonevimimix/wagafevomijukezod.pdfIn PDF document text
    • https://s3.amazonaws.com/mivokozibu/lipids_test_lab_report.pdfIn PDF document text
    • https://s3.amazonaws.com/dosipive/zenig.pdfIn PDF document text
    • http://jedigosegukigif.rf.gd/84009732340.pdfIn PDF document text
    • http://dinoxisajuz.rf.gd/14433165387.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_off0000ed5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED5D 5332 bytes
SHA-256: 8c9b3c090bc2301ec01b9803089fa667f5d8d1ccb96aea87afc7ab08934e14d0
font_01_sfnt_off0000ff62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF62 11696 bytes
SHA-256: 3c43641db3e990c0df1149f9e1c56a4224122cbb096ccd9a9ceaecb7bd76eed4

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