Malicious PDF — malware analysis report

Static analysis result for SHA-256 0965c8dda9b00385…

MALICIOUS

PDF

116.8 KB Created: 2021-03-12 14:06:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ae89c1a676d0e17a01d590ef819bd126 SHA-1: ba6f0dc7a9b557e069aea9ddbcb0d3571f3466c0 SHA-256: 0965c8dda9b003859be47e43c407fb34ecc890af18b78f4c3daae6857c740dec
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 suspicious domains, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external links suggest it's designed to redirect users to malicious sites, potentially for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://zajinet.ru/award?keyword=auditor%25C3%25ADa+de+seguridad+inform%25C3%25A1tica.+ifct0109+pdf
    • http://logmeinnow.xyz/blauer_uniform_shirts_super_shirt2bho1.pdf
    • http://popuboloza.22web.org/wallace_stegner_angle_of_repose.pdf
    • http://wejesigozolireb.getenjoyment.net/quadratic_function_review_common_core_algebra_2_homework_answers.pdf
    • http://tehnopolis.org/kuwenozp7jm.pdf
    • http://zatutajijiti.getenjoyment.net/96398040091.pdf
    • http://solusaxisabo.scienceontheweb.net/kesuwowarovuf.pdf
    • http://pakunobun.getenjoyment.net/atomic_absorption_spectroscopy_principle_and_instrumentation.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://667b589a-70dd-4c78-a03f-47f6e9f07b1f.filesusr.com/ugd/db80c5_c354b1557a694e19b620008f908e734a.pdf?index=true
    • https://dd7ee03d-3646-4e01-a1e1-4c0a7e2c9e57.filesusr.com/ugd/d7ba0f_b8954333b5564d188a911d778db152ea.pdf?index=true
    • https://s3.amazonaws.com/fukezavazuj/sewapeb.pdf
    • http://darewuxopasog.rf.gd/emotion_wheel_worksheet.pdf
    • https://fa90eb46-aa9b-4fd1-a2e8-e903ec8e50a4.filesusr.com/ugd/575fb0_f5e8e36fbce94529960840030fad5247.pdf?index=true
    • https://f7f2eb1f-4ce6-40bf-b337-6bcc2c9c1a95.filesusr.com/ugd/dc6899_ae4ee00d25ea40119716e9adb72cb5a3.pdf?index=true
    • https://78e27e65-9996-4239-a63d-7a21722db537.filesusr.com/ugd/03f576_5867119559fc45c7b4db62034eea772e.pdf?index=true
    • https://s3.amazonaws.com/lovetijif/afda_mean_median_mode_range_worksheet_answers.pdf
    • https://6d4a8fb0-9a8a-4850-8aa1-2b5706121c9a.filesusr.com/ugd/ff2e72_3854a775528f4ce3ae07a317ddcaed71.pdf?index=true
    • http://wadatenut.rf.gd/free_lagu_ariel_noah_jepang.pdf
    • https://c8070bf9-ed42-4c5d-8eb8-ca35ee70f136.filesusr.com/ugd/d38238_9ddefef7e75e43d8959a1d2c847c9566.pdf?index=true
    • http://lukafimagog.atwebpages.com/halo_beyonce_piano.pdf
    • http://fujuresaw.epizy.com/12641121503.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_off00016417.bin
cdb71f329424cc12264a893c02d66cbc80dac62ca3b5373be5f99706cf1d0b32		 pdf-font-stream PDF embedded font (sfnt) at offset 0x16417 5984 bytes
font_01_sfnt_off000177ce.bin
8206a4c96da2ed1b672f24048bcb244cdc12d7e80e9a31f4441d8c85bc855a49		 pdf-font-stream PDF embedded font (sfnt) at offset 0x177CE 12224 bytes
font_02_sfnt_off00019f4b.bin
65a73d1551e59adaeeedec7c3f73bd8f1d28ae5a1abb22f5a67c816fdf5006e9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x19F4B 16088 bytes
font_03_sfnt_off0001b3fa.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1B3FA 4324 bytes

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