Malicious PDF — malware analysis report

Static analysis result for SHA-256 d0f35b0eeb5ec0d7…

MALICIOUS

PDF

88.0 KB Created: 2021-03-12 08:24:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 556cad97edaed4ab26a71c6ad45b2a5b SHA-1: b85dd58fa86207e157402b8173c8f508cad981fc SHA-256: d0f35b0eeb5ec0d7a9c5ab00f43a94246fc10148c40e718e1f5b7448bd4caa03
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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 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://jacksth.ru/award?keyword=carl+jung+el+libro+rojo+pdf PDF link annotation
    • http://airet.space/latesosogy9zs.pdfIn PDF document text
    • http://penexej.mywebcommunity.org/brlps_syllabus_2020_download.pdfIn PDF document text
    • https://japiravonasuv.weebly.com/uploads/1/3/4/6/134644749/c8a99ea.pdfIn PDF document text
    • http://mgacessoria.online/79461436500fv5e9.pdfIn PDF document text
    • https://gupijevud.weebly.com/uploads/1/3/1/4/131407369/4659248.pdfIn PDF document text
    • http://ketadiets.site/what_are_the_mortal_sins_in_the_catholic_churchpex7q.pdfIn PDF document text
    • http://hhizmet.com/916087273474buwc.pdfIn PDF document text
    • https://tazabojadikeze.weebly.com/uploads/1/3/4/6/134648043/tiwupulalorik.pdfIn PDF document text
    • http://bobixina.getenjoyment.net/data_analysis_techniques_in_quantitative_research.pdfIn PDF document text
    • http://differencecheats.net/67808375079d5nts.pdfIn PDF document text
    • http://help-feedback-amzn3.xyz/772754032909lquw.pdfIn PDF document text
    • http://forisawidokomor.sportsontheweb.net/brazilian_portuguese_course.pdfIn PDF document text
    • http://unityfree.xyz/cities_skylines_building_levels7w6pj.pdfIn PDF document text
    • http://kernig.online/notuwozixisonubrj7th.pdfIn PDF document text
    • http://fiziwafofekaku.mygamesonline.org/what_are_the_types_of_conclusions.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/kavifunaruvi/givofukafo.pdfIn PDF document text
    • https://s3.amazonaws.com/kagedatabujo/jofaneru.pdfIn PDF document text
    • https://s3.amazonaws.com/posaxugidut/what_are_licks_and_riffs.pdfIn PDF document text
    • https://s3.amazonaws.com/gimufesajo/best_way_to_write_science_article.pdfIn PDF document text
    • https://s3.amazonaws.com/wuvepilamamuse/laxapivezivup.pdfIn PDF document text
    • https://s3.amazonaws.com/fezenur/does_ford_ranger_come_in_4x4.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010966.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10966 4804 bytes
SHA-256: c3e4a3709807c9f36a94022d259545a11df31892e5f066fd250b6ba439a65af7
font_01_sfnt_off00011a4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A4A 5152 bytes
SHA-256: 3c03c01a43ec99d2b55103ae6f16e13ab0734f278e36e4a0f70a08c71a20b51a
font_02_sfnt_off00012bdd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BDD 11420 bytes
SHA-256: 8b071592ffe2f41632291862ec23b2981c7bc0930fc58b02225f8b62b1eca073

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