Malicious PDF — malware analysis report

Static analysis result for SHA-256 c57b4e1e485d3323…

MALICIOUS

PDF

71.3 KB Created: 2021-02-13 07:51:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 9a3a89242b1b65384d0120eccb4683ad SHA-1: a8c4e4a2fe013da54962564dca328202e0ef373a SHA-256: c57b4e1e485d3323a809a9c52ac49621ecb8c3fd31a883ad9a7fc440835f1c42
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, indicating a link farm or phishing attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a malicious document designed to redirect users to potentially harmful sites.

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://jottigo.ru/wix?keyword=boy+scout+sunday+2020 PDF link annotation
    • https://cdn.sqhk.co/jenetuwuda/ii3gege/guardian_tales_guide_world_1-_4.pdfIn PDF document text
    • https://cdn.sqhk.co/goworonol/jdihigM/borat_soundboard_funny_sounds.pdfIn PDF document text
    • https://cdn.sqhk.co/sukijubese/ighfjh9/mirror_lake_state_park_campground_map.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4496571/normal_5ffe7ae62e348.pdfIn PDF document text
    • https://fatomomome.weebly.com/uploads/1/3/1/6/131606630/7810158.pdfIn PDF document text
    • http://vuzitofakomuj.22web.org/xupuja.pdfIn PDF document text
    • http://pitupunum.iblogger.org/harvard_referencing_software_free.pdfIn PDF document text
    • https://bojufare.weebly.com/uploads/1/3/1/0/131070992/c03384b0d247.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gizejofak.epizy.com/phn_mm_bkav_pro_min_ph.pdfIn PDF document text
    • https://s3.amazonaws.com/gazivemon/purble_place_apk_pc.pdfIn PDF document text
    • https://s3.amazonaws.com/samopakamefap/64448259368.pdfIn PDF document text
    • http://suwulinivez.rf.gd/55374536323.pdfIn PDF document text
    • https://s3.amazonaws.com/rivazixexuguri/8799844053.pdfIn PDF document text
    • http://rakumutebita.epizy.com/nukewala.pdfIn PDF document text
    • https://s3.amazonaws.com/kizugokofo/peromusukirupoke.pdfIn PDF document text
    • https://s3.amazonaws.com/gimisorixosu/medugigagonefito.pdfIn PDF document text
    • http://rupilozomu.epizy.com/nespresso_inissia_manual_uk.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_off0000d7ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7FF 5228 bytes
SHA-256: 0b29acde867be7c5c8cce439a8769014f392cef1801addcde1acba3459ddea74
font_01_sfnt_off0000e9ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9ED 11536 bytes
SHA-256: dbcd7c47ecb64c72fa2c244df056f5ce94176b852cb7ab4014fbe759f54fabae

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