Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3ddb2aea0e74a16…

MALICIOUS

PDF

77.2 KB Created: 2021-02-08 19:08:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 78f63a3e1c16e22638835b2cb299d70b SHA-1: 94fd768580e4181ff5c668807396669c97ee4637 SHA-256: a3ddb2aea0e74a162f105a14fba1ae5bb3d05029830a62410338000ef845dd87
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, and is flagged by ML classifiers and ClamAV as malicious. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using link farms on disposable hosting, suggesting an attempt to obscure the true malicious destination. The presence of external URIs and the overall structure strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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 is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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/aws?utm_term=south+african+wine+industry+information+and+systems PDF link annotation
    • http://merishwheelrecords.com/best_quality_camera_app_downloadprn69.pdfIn PDF document text
    • http://homiak.fun/luxikovepujuginqtlwr.pdfIn PDF document text
    • http://1gusevshop.space/bass_booster_bluetooth_speaker_apkj5haj.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368265/normal_5fc869a1ba814.pdfIn PDF document text
    • http://cherrypimp.online/84668353931d3e27.pdfIn PDF document text
    • http://slampochka.ru/pelican_mall_sinema_bilet_fiyatlarsgyg8.pdfIn PDF document text
    • http://zuvels.xyz/vativikuratuwimaxyd9u7.pdfIn PDF document text
    • http://meetchambre.xyz/handwriting_worksheets_for_2nd_gradel6uci.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4423750/normal_6002f4ee7f8cd.pdfIn PDF document text
    • http://tophomework.space/b._ed_syllabus40y6z.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4425235/normal_5fe4644be7f54.pdfIn PDF document text
    • http://dodemawaj.iblogger.org/information_of_carbon_compounds.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387037/normal_601dc907f1bc7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4428342/normal_6015d9c379529.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fesejuseluniw.rf.gd/jufafasezaf.pdfIn PDF document text
    • http://foxozokibi.rf.gd/37609599898.pdfIn PDF document text
    • http://nipixexit.rf.gd/avast_antivirus_uninstall_software.pdfIn PDF document text
    • http://vuvuvemalazot.epizy.com/filehippo_winrar_32_bit.pdfIn PDF document text
    • http://sofikej.rf.gd/concrete_masonry_units_size_and_shape_guide.pdfIn PDF document text
    • http://jefebewo.epizy.com/adobe_illustrator_corel_draw.pdfIn PDF document text
    • http://kowivinig.epizy.com/34425124841.pdfIn PDF document text
    • http://sumexodugefuw.epizy.com/barbie_games_makeup_free.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_off0000edea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDEA 5528 bytes
SHA-256: 7ae21980c36954a9b142dd5c1ff82e126cb7afd68c54f5e5cf90f5a6feb2a7f9
font_01_sfnt_off000100a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100A0 11304 bytes
SHA-256: 016e3ba773bc1cbcb2350ac697170e5a6a208b61cd3252be2f7fbea60060f795

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