Malicious PDF — malware analysis report

Static analysis result for SHA-256 50b6d3b191ecac3d…

MALICIOUS

PDF

87.6 KB Created: 2021-03-23 14:26:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c733dc3a793f6b8e30ffefaae49e522c SHA-1: 652aeadbaff05456e5b046623af87b0009097dbf SHA-256: 50b6d3b191ecac3dc5ff520321bc88f1092db49b6766785c4a1009e23f3237c9
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to other PDF documents hosted on various platforms. This behavior is indicative of a link farm designed to manipulate search engine rankings or distribute malicious content. The ClamAV detection and ML classifier further support the malicious nature of this file, likely used as a lure for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://mezovuduw.ru/wix?keyword=social+darwinism+vs+gospel+of+wealth
    • https://cdn.sqhk.co/vewukiziwemi/hcdfl6r/66408601579.pdf
    • https://jikegasabum.weebly.com/uploads/1/3/1/8/131856907/d9c43b4bd2d26e.pdf
    • https://cdn.sqhk.co/litawoxelida/TjjjddA/play_earn_to_die_3_unblocked.pdf
    • https://sulogaxelope.weebly.com/uploads/1/3/1/4/131438888/9037633.pdf
    • https://derifopo.weebly.com/uploads/1/3/4/4/134490925/latebexixir.pdf
    • https://cdn.sqhk.co/jogepirar/Bhbhgig/fijedupok.pdf
    • https://cdn.sqhk.co/kagurase/T3Thg7v/gravity_definition_drivers_ed.pdf
    • https://cdn.sqhk.co/wetabupi/hijaBie/lastday_clash_heroes_battle_mod_apk_android_1.pdf
    • https://cdn.sqhk.co/masunidupag/dhcjiib/mimpi_digigit_ular_di_tangan.pdf
    • https://cdn.sqhk.co/zuzipogowita/ii3Fhbn/how_to_reup_my_simple_mobile_account.pdf
    • https://cdn.sqhk.co/pomoliwekag/e0Bgeha/jain_bhajan_audio_free.pdf
    • https://cdn.sqhk.co/modonasuje/hiigdig/charmeleon_evolution_pixelmon.pdf
    • https://cdn.sqhk.co/letarezetap/PibLjcP/clothes_worksheets_clipart.pdf
    • https://surumovosutimu.weebly.com/uploads/1/3/4/7/134733284/nikijiporosubus-wajasugifetese-jatatezuse.pdf
    • https://cdn.sqhk.co/bibolaned/hQe2iei/58517886059.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/a188a0e6-7229-414f-9910-58f218204a92/what_does_an_it_system_engineer_do.pdf
    • https://3e1ae61b-6b68-46dc-8a90-d1c7a5b9f91c.filesusr.com/ugd/b8bbd7_d88b80efeb484a9a8a77f0c5c80c008f.pdf?index=true
    • https://234a0c07-d908-4261-bb83-16b3c96a9b04.filesusr.com/ugd/73e0e6_b58fbc2155084d58aca3561699ba216d.pdf?index=true
    • https://aa4c2489-c93b-4667-afab-104bf5323bad.filesusr.com/ugd/8b49c6_d1d03de264144b30a230e51e21ac25fe.pdf?index=true
    • https://911f1565-2faa-4874-b261-330d521e7362.filesusr.com/ugd/f46427_b2496f668dbf435ea18c39f92d49990d.pdf?index=true
    • https://uploads.strikinglycdn.com/files/73aa2d09-c00e-48a0-8caf-b3c9f90666e6/what_card_means_death_in_tarot.pdf
    • https://4123e755-5e7e-4fb8-b167-49ba90d37259.filesusr.com/ugd/fd3290_0d84499644fe4a9b9eab07fe57af0056.pdf?index=true
    • 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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001097a.bin
94cdcfaaf2157f85018e024c66f94f8c172831f90f66af4a61c8485cf9fc90a8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1097A 5612 bytes
font_01_sfnt_off00011c64.bin
4ecec629b6c4cdd8cb8a3e2227c2588610229599c2a2523058a789f488d11f35		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11C64 11320 bytes
font_02_sfnt_off000142de.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x142DE 4324 bytes

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