Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad6596a582ce6b93…

MALICIOUS

PDF

97.8 KB Created: 2021-03-22 01:31:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 81c2b9c88d660e4da250db274704c6ee SHA-1: 2997a10c90e6c817a46bf8b08cb8a0c30ff0237a SHA-256: ad6596a582ce6b93741eb2a01e03836bbe21ebc7fcbf65bd323d6f9004ad6bed
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains numerous external links, many pointing to disposable hosting, and one primary malicious URL. ClamAV and ML classifiers identified the file as malicious, specifically a phishing trojan. The document body, though heavily obfuscated, suggests a lure related to a 'character sheet', which is likely a pretext to drive users to the malicious URL for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://baarspo.ru/wix?keyword=half+orc+rogue+character+sheet PDF link annotation
    • http://solavopuna.22web.org/tezozun.pdfIn 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://51bf459c-6b46-41b0-863f-532cf8a77e0d.filesusr.com/ugd/2eedf1_e93f35248aa04b66adf6c7f3d29e1e19.pdf?index=trueIn PDF document text
    • https://6c892e0d-5736-4b4a-96a3-cd490fd1fe3d.filesusr.com/ugd/1407cd_3c479dbf924444f5896da679ae2e28f6.pdf?index=trueIn PDF document text
    • http://botalibinizor.rf.gd/madumavil.pdfIn PDF document text
    • https://cc46d2ba-e7cf-42f8-aa62-b015a0c17ef0.filesusr.com/ugd/d180c3_d73258ff24ef437196ef5bcad136dcf7.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/88324e1e-a0b8-4206-9d41-dd6f39a0c238/how_to_create_wordpress_website_in_hindi.pdfIn PDF document text
    • https://ce2645ba-e89a-43d5-afff-5c0150757291.filesusr.com/ugd/c63dba_79559db843b84044a68a33d6acbfd3e2.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/muwemivumazulax/how_much_does_a_speed_queen_front_load_washer_cost.pdfIn PDF document text
    • https://5a995288-ce6f-4ae3-a3e6-14272d8003db.filesusr.com/ugd/7be1cd_0d0c600d1df24531af30a6670185fcf0.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/20d7c963-542b-4658-a4a3-42d1b66aefed/rapelemap.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/387010dc-fac7-466a-b18e-409f8f753e3f/simple_past_tense_irregular_verbs_worksheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/71a90d56-6884-4cdd-ac9c-0e445be8720b/8950550888.pdfIn PDF document text
    • https://s3.amazonaws.com/kotidox/gomati.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6201293c-9126-4e89-89ee-7c78ddc12943/bodega_dreams_chapter_summary.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/576be7c3-7f94-4a63-b484-33ef8211451d/eventide_h9000_plugin.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/883aee37-d4fa-4a31-b80d-d6a946ccd8a8/bissell_carpet_cleaner_spare_parts.pdfIn PDF document text
    • https://4e33067b-0f13-4bed-bb9c-ea95f768fd7c.filesusr.com/ugd/23924c_23d6d23a7fbc41e8902055d603a1411e.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/e753a21c-771a-4e0c-ac7a-ae6d2e24bb76/second_order_derivative_exponential_function.pdfIn PDF document text
    • https://d23eb412-52e1-45ef-a32a-0c032022daee.filesusr.com/ugd/03485a_07f79b846cdf466e87a2b85dac355ae9.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/1ed782bc-c317-433f-8a5a-df18d2f8d624/99744082818.pdfIn 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
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000133c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133C7 4832 bytes
SHA-256: 9debe6bea70db8a53c050368c0f8ff5854edeba03b5e9b56d783764062264ca1
font_01_sfnt_off0001444b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1444B 10944 bytes
SHA-256: db8f98ee75894bf8d7f431fce21c1a6b6c5bcd3b0040f3fe834488a00ad962c2
font_02_sfnt_off000169e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x169E6 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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