Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3b6c1548165ae33…

MALICIOUS

PDF

88.7 KB Created: 2021-04-07 02:07:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e67ce4fdcaa4c0779cb15f21606ca64b SHA-1: 18cae2f4c17a58877e61268443adad66e6b9de90 SHA-256: b3b6c1548165ae330b7d23e1af644d954b345a39bf89170851172fde98ca6f06
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to SEO-optimized PDF documents, suggesting a link farm designed to drive traffic to malicious sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. The embedded URLs are the primary indicators of compromise, directing users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://resalured.ru/award?keyword=notes+on+statistical+quality+control+pdf
    • https://cdn.sqhk.co/mekaxosur/DWhj4Af/38647604041.pdf
    • https://cdn.sqhk.co/poxirowo/4k19hb8/painting_house_exterior_colour_ideas.pdf
    • https://cdn.sqhk.co/kutajanode/gfgiijC/phone_usage_tracker_screen_time_monitoring_apps.pdf
    • http://kavelizopepi.mywebcommunity.org/pagezajovodip.pdf
    • https://cdn.sqhk.co/dobajinorite/Dhjijhb/37450467340.pdf
    • http://mosuxuvemuzuwex.mywebcommunity.org/plant_embryogenesis_zygote_to_seed.pdf
    • http://muziwavesos.iblogger.org/husky_20_gallon_air_compressor_replacement_parts.pdf
    • https://cdn.sqhk.co/pekobenew/Zjc5jcy/14997893043.pdf
    • http://zozamowewideno.mypressonline.com/google_academico_2020.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://ed8bc375-cd54-49ab-9ddb-988cb5b2fc3d.filesusr.com/ugd/3f3824_f57ffe25e011484bbdf5d905277ca801.pdf?index=true
    • http://pawepeg.atwebpages.com/catalyst_9400_datasheet.pdf
    • https://c4a5d104-04f9-44e6-b03f-1f5edac3680f.filesusr.com/ugd/f23921_ea371775ab044dc8939cac59db992f92.pdf?index=true
    • http://bajofot.epizy.com/edit_text_free.pdf
    • https://uploads.strikinglycdn.com/files/04d34432-1a59-42df-aac4-5e94ff4662b1/how_to_critically_appraise_a_medical_journal_article.pdf
    • https://uploads.strikinglycdn.com/files/1770d2bd-9acb-4193-930f-3338003b228a/wusenogukakekijuxudatap.pdf
    • https://30de3caf-c510-4ce9-8691-b8280dc60d9b.filesusr.com/ugd/4980ee_ae0dbe5e870946b88620912e720d858c.pdf?index=true
    • https://uploads.strikinglycdn.com/files/ccb5d4ce-aefd-4cdb-8f80-dc8061dde704/sony_a230_untuk_video.pdf
    • https://uploads.strikinglycdn.com/files/673ca611-4396-49d2-a8f7-fb818030205e/what_is_the_earth_atmosphere_composed_mostly_of.pdf
    • https://uploads.strikinglycdn.com/files/fd097486-b026-4d26-9a6a-ba1d2ac69aac/fijabapilarejikon.pdf
    • http://xowilewegiwo.myartsonline.com/ascent_of_sap_class_10.pdf
    • https://uploads.strikinglycdn.com/files/3d87f7c4-f583-471e-9e9d-ea346f5e3629/dell_optiplex_9010_all_in_one_teardown.pdf
    • https://uploads.strikinglycdn.com/files/58607d2d-5840-4be5-a320-7bdd0a4eeac9/baby_girl_birthday_dresses_for_sale.pdf
    • https://uploads.strikinglycdn.com/files/2b753af3-1e17-49ac-955a-33fc554a737c/metro_2033_moscow_dead_city_walkthrough.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fae4.bin
1a73fc084ed1b309174dd507309ffa10e51d3c2b49736a99ddc85eb0aed41431		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFAE4 5348 bytes
font_01_sfnt_off00010d29.bin
8652522a46fc63549263a47128acdc6684b8539d0d6665d52a1ad3b8b2db464c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10D29 2168 bytes
font_02_sfnt_off00011686.bin
fad9097cfb40e9e37f1598d70e4d8019bcb8fc409b1214e4122161e28f1b23aa		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11686 11820 bytes
font_03_sfnt_off00013ebe.bin
f13f7ddc20cbb5826cfc4b5a9db676aa7118f0433df2adf337904653d458680d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13EBE 16260 bytes

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