Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5b79c8ad82d775b…

MALICIOUS

PDF

89.2 KB Created: 2021-04-07 02:13:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: d16e212acf9551760cd9335f9b607216 SHA-1: 12dafbbdb1807a9d6b0757c5afd082b0f50449c3 SHA-256: b5b79c8ad82d775bb39914ece387a348680d015f994dcc7f9accee225aae3237
156 Risk Score

Malware Insights

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

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 0.9956

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://kuzutuzo.ru/wix?keyword=constructing+congruent+angles+worksheet PDF link annotation
    • http://lulilafemavivog.mygamesonline.org/java_projects_for_beginners_download.pdfIn PDF document text
    • https://cdn.sqhk.co/nevupediwix/U2jb2tu/peninsular_war_battles.pdfIn PDF document text
    • http://pay-order.info/44377667200zh4y7.pdfIn PDF document text
    • https://cdn.sqhk.co/fosojatesog/Agjjahh/41551921989.pdfIn PDF document text
    • http://kojazunupetip.mygamesonline.org/lozetunajolotatajulibi.pdfIn PDF document text
    • http://max-lifting.store/433034503836e7ri.pdfIn PDF document text
    • http://zutelotojenexop.getenjoyment.net/zosirixusagag.pdfIn PDF document text
    • https://cdn.sqhk.co/tosilura/slDCihN/try_not_to_laugh_challenge_hard_impossible.pdfIn PDF document text
    • http://rat-red.space/gelazol8l6gx.pdfIn PDF document text
    • https://cdn.sqhk.co/mekaxosur/SgggiQE/battery_charger_walmart_aa.pdfIn PDF document text
    • https://cdn.sqhk.co/ragejeli/e4vRpgf/space_flight_simulator_mod_apk_download_for_pc.pdfIn PDF document text
    • http://fontawesome.iohttp://fontawesome.io/license/In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/tenunud/wodadefukaxegerime.pdfIn PDF document text
    • https://s3.amazonaws.com/vososasoxumete/halloween_word_search_worksheets.pdfIn PDF document text
    • https://s3.amazonaws.com/sesafefanulokam/waves_maxxaudio_pro_software.pdfIn PDF document text
    • https://19004eff-8f5e-45b0-b15a-9fbdbd99e39d.filesusr.com/ugd/578ea4_777171d295c34bec96c1d2773c91a515.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/megelugik/88463252331.pdfIn PDF document text
    • https://44f39d5c-a655-4437-91b6-62b11e148e71.filesusr.com/ugd/eb4c03_07a0840af38846c5b06342e8d098f2fd.pdf?index=trueIn PDF document text
    • https://c33c3ce4-fa2f-4f19-9477-7a801b41b29e.filesusr.com/ugd/ebbcbd_793238d7ef894cc79031f77ba8b1a2da.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/pozokimepe/kongo_saga_ruleset.pdfIn PDF document text
    • https://be8414c4-f2d5-40c6-b8a8-1a5561a1dac7.filesusr.com/ugd/a452ea_488d53b361c246339398a3ec2255a96c.pdf?index=trueIn PDF document text
    • https://21c505bb-01ca-4817-a549-4ed1ebba5040.filesusr.com/ugd/7d7105_920c7316a4864372ba702de1f9569681.pdf?index=trueIn PDF document text
    • http://kadoxosin.atwebpages.com/cambridge_primary_science_6.pdfIn PDF document text
    • http://xamukipadu.myartsonline.com/99280572238.pdfIn PDF document text
    • https://bf130ee1-1463-4c69-9604-1b23772ced92.filesusr.com/ugd/b4609a_eddf0e356f0943efa2dd7c3408afaa1c.pdf?index=trueIn 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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 6

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dcf6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCF6 8160 bytes
SHA-256: b237a8a998a7e39f83afc95ec9085b792e5675a4ecd892eeffff6e3659981f65
font_01_sfnt_off0000f233.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF233 2332 bytes
SHA-256: fda4b1b3c769c672a39f1cd71ffe955e731c1c177e3f5f177f74fd7727ce9333
font_02_sfnt_off0000fc8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC8D 5124 bytes
SHA-256: ea867aa85de64419d1e2de70463f8f014ee621c30a2dc235cc2bba28cf8b0bd0
font_03_sfnt_off00010e04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E04 10492 bytes
SHA-256: cd6c43db797366182e97640e629c598179416751b23fdf183216ebaae92fd04b
font_04_sfnt_off00013225.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13225 16208 bytes
SHA-256: da4ea59cc176b97d3f684b7bb2b26b968a8f164288cc6b2b9da6348f398cb169
font_05_sfnt_off0001476c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1476C 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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