Malicious PDF — malware analysis report

Static analysis result for SHA-256 4bc4968c0b2f9b81…

MALICIOUS

PDF

82.7 KB Created: 2021-03-15 12:35:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: b45491fc386978daecd46c57bd2461ee SHA-1: ea7250f4b412d92ec3047236e68f9f8163f6ed40 SHA-256: 4bc4968c0b2f9b816ccbec38caf50d4ee7d29c78d447d3347f27283cdaf707fc
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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/strik?utm_term=how+to+clean+hoover+floormate+deluxe PDF link annotation
    • http://goproits.com/is_star_citizen_going_to_be_released9utmd.pdfIn PDF document text
    • http://inscarusa.info/xebuzoxakisuzwnz4q.pdfIn PDF document text
    • https://kegewibenufugix.weebly.com/uploads/1/3/2/6/132682471/topezemisaren_mowofowere.pdfIn PDF document text
    • https://cdn.sqhk.co/mevazasid/Qidojee/fawix.pdfIn PDF document text
    • https://warexuzema.weebly.com/uploads/1/3/4/6/134601764/8738222.pdfIn PDF document text
    • https://wadasazaba.weebly.com/uploads/1/3/3/9/133999184/027c5846ff.pdfIn PDF document text
    • http://punegasu.22web.org/dokegoleparobakafomuzamu.pdfIn PDF document text
    • https://cdn.sqhk.co/tivuzofep/ifjjjej/34632824411.pdfIn PDF document text
    • https://notovozeje.weebly.com/uploads/1/3/1/3/131379031/vejidun.pdfIn PDF document text
    • https://cdn.sqhk.co/wipedekis/dlSPLhe/wisupuwab.pdfIn PDF document text
    • http://bathforlegs.xyz/what_is_a_vision_dream1o3ep.pdfIn PDF document text
    • https://vusexojepaxeva.weebly.com/uploads/1/3/4/0/134096357/57df4c.pdfIn PDF document text
    • https://pidofuvu.weebly.com/uploads/1/3/0/7/130739764/a6c6bf639.pdfIn PDF document text
    • http://burrrhey.tech/briggs_and_stratton_intek_190_parts_diagramd9brk.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vetiluxakosimut.epizy.com/76876997873.pdfIn PDF document text
    • https://6205d428-d5dc-494e-bbc3-e2236f9d811e.filesusr.com/ugd/6885a6_5ac18a1909a741e0966bd81bb52d3784.pdf?index=trueIn PDF document text
    • http://dizoxijip.rf.gd/is_sexting_legal_in_indiana.pdfIn PDF document text
    • https://e25b7b56-d8f7-44cb-9276-56428e53d1cc.filesusr.com/ugd/63f3e8_4771dd3578224ed38b3d735c75414cd7.pdf?index=trueIn PDF document text
    • http://jonemif.epizy.com/guess_who_sheets_printable.pdfIn PDF document text
    • https://b998fa74-583e-446a-a2a7-67f41460fdb2.filesusr.com/ugd/e081f8_f0d49f64ecc1469fa5e5b2224ce37a26.pdf?index=trueIn PDF document text
    • http://bajokekez.epizy.com/99344724049.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ee0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE0D 5264 bytes
SHA-256: 1fa122c3a83dadd3feb6de2acb860117fda3e0b1489d071fbc35d21c5469d2fe
font_01_sfnt_off0000ffe2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFE2 11312 bytes
SHA-256: 9a6a98fb72ef129c141e753749f6fbf7609132995c73d4e14523a041fa2365e3
font_02_sfnt_off00012622.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12622 16312 bytes
SHA-256: aad9bc0f36eadc3314e08670b59090120051e308b357201f134af3d0b781b2b0

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