Malicious PDF — malware analysis report

Static analysis result for SHA-256 df64f6954ffc2273…

MALICIOUS

PDF

78.2 KB Created: 2021-03-15 15:16:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e1c0f8f1615a5540515167310c70ee08 SHA-1: cd5dfdb1fe50563fd42b22c9a56f49100af0d812 SHA-256: df64f6954ffc2273c8662ade98fcd05c494c221d9cb830fd547b553da8ce5fe4
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, a common tactic for SEO poisoning and phishing. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as a phishing trojan. The embedded URLs suggest the document is designed to redirect users to potentially malicious sites for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://maypoin.ru/wix?keyword=knight+kristen+ashley+descargar+pdf
    • http://teaitalis.space/snow_report_la_chapelle_d_abondance_francezxqx8.pdf
    • https://vodefuba.weebly.com/uploads/1/3/4/6/134688083/cfb4e5874.pdf
    • http://dihtyar.online/74466480506b8rnj.pdf
    • https://worowisirokisid.weebly.com/uploads/1/3/4/8/134856274/favono-foxuf-widoratirafo.pdf
    • https://wozukaziximuru.weebly.com/uploads/1/3/4/5/134587045/a9d9c02b82780a.pdf
    • https://cdn-cms.f-static.net/uploads/4487197/normal_600ec10819b4c.pdf
    • https://xolejapu.weebly.com/uploads/1/3/4/4/134491856/546fa08bd2.pdf
    • http://lnstagramservicecopyrights.com/dark_souls_3_strongest_bossesppo90.pdf
    • https://cdn-cms.f-static.net/uploads/4497109/normal_603131f65102a.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/zesotat/shutterfly_app_promo.pdf
    • https://uploads.strikinglycdn.com/files/431526df-5645-428b-926e-2ed32a830419/digitech_gsp_2101_studio_tube.pdf
    • https://s3.amazonaws.com/xomudufe/regression_analysis_journal_article.pdf
    • https://8137cd1e-393d-4948-8193-eca935452849.filesusr.com/ugd/756799_74fffd2821ea48fe859bab35e657b9d2.pdf?index=true
    • https://s3.amazonaws.com/kifutizijebuj/bash_script_example_tutorial.pdf
    • https://s3.amazonaws.com/sowewazulejewi/pofazaloz.pdf
    • https://uploads.strikinglycdn.com/files/a581dcdf-fe33-42c6-beb1-195c38f3d34c/26052138720.pdf
    • https://uploads.strikinglycdn.com/files/1f2debed-8f39-4883-8bac-de0c2a0d1fec/short_batman_bedtime_story.pdf
    • https://f405dec1-7f90-4f4c-a861-5286f67d0127.filesusr.com/ugd/ab922d_eb297e9e8ed143a0a952966b8db80a9a.pdf?index=true
    • https://2178e3ec-2e0a-46e0-af35-d8a6fdfeb21a.filesusr.com/ugd/c411cf_6b6e648cc6204c4685253fa2c4a63a11.pdf?index=true
    • https://0fc0baf9-b884-4fcd-968e-f93c0f938930.filesusr.com/ugd/68ec51_5ab5a627e1d4400dbe02aa2664297554.pdf?index=true
    • https://4328a374-8b5c-4134-9cef-e132ca5fc89d.filesusr.com/ugd/6732b1_af5f06a3b8ae477f9f8213e75dbcbe6b.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f28f.bin
b1657982b37539f73ac3fbb142a4d8ed31eb4a26d9411b7fb281dc71fa430473		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF28F 5552 bytes
font_01_sfnt_off0001057b.bin
858ad8d70804d86b97b5c14eebf94adf11a4376b7a16d05dad5e4394081de5bd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1057B 12444 bytes

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