Malicious PDF — malware analysis report

Static analysis result for SHA-256 24f4d6d4a432438d…

MALICIOUS

PDF

75.9 KB Created: 2021-03-14 03:00:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: 023622635366488ab587a7f21ef0d18e SHA-1: 9db07cf1536ab27a91542b441e4218cc7f0c71ba SHA-256: 24f4d6d4a432438d9fc5c0c263ecfb868845669be8fa82202e0451c2bc76e94a
186 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 pointing to disposable hosting, suggesting a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery. No scripts were extracted, but the embedded URLs are the primary indicators of compromise.

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://mezovuduw.ru/award?keyword=company+presentation+example+pdf PDF link annotation
    • http://rozewevojalel.sportsontheweb.net/82335825842.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377125/normal_60393562af2a5.pdfIn PDF document text
    • https://bisudika.weebly.com/uploads/1/3/4/3/134366448/5861931.pdfIn PDF document text
    • https://sepuvoguzunisam.weebly.com/uploads/1/3/4/4/134488558/fb049248776.pdfIn PDF document text
    • https://kuvugelovusilu.weebly.com/uploads/1/3/4/4/134437140/979a239b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480728/normal_604705d234075.pdfIn PDF document text
    • http://mozobadijoba.medianewsonline.com/best_roku_device_for_streaming_tv.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371553/normal_600c98a993cf3.pdfIn PDF document text
    • http://kenugizi.getenjoyment.net/what_are_the_4_types_of_qualitative_research_design.pdfIn PDF document text
    • https://mixusabap.weebly.com/uploads/1/3/4/0/134096097/8061050.pdfIn PDF document text
    • https://malojedatev.weebly.com/uploads/1/3/0/8/130813840/a5b034fe.pdfIn PDF document text
    • https://tiwudusakuwizir.weebly.com/uploads/1/3/1/6/131637104/zijamumexinobonotero.pdfIn PDF document text
    • http://pevazaw.mypressonline.com/wositonosivakipevov.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450036/normal_601233edbddf7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401691/normal_6018cc913a072.pdfIn PDF document text
    • http://retamos.mygamesonline.org/47543161911.pdfIn PDF document text
    • https://vifejekim.weebly.com/uploads/1/3/5/3/135322606/bexumasovigul-bumutideda-bezerezila.pdfIn PDF document text
    • http://jojazinex.mygamesonline.org/the_maintenance_of_brick_and_stone_masonry_structures.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://bef89f6e-6323-4b84-ad9d-a44490bfcc4f.filesusr.com/ugd/96768c_8c931cf193114b0191771354828376bd.pdf?index=trueIn PDF document text
    • https://aa3bb5c3-2bd4-4791-9e2a-6e31d5009b04.filesusr.com/ugd/60e703_cfbeefa077874dcdbf46576f482331ba.pdf?index=trueIn PDF document text
    • http://bitines.myartsonline.com/kimuras.pdfIn PDF document text
    • https://e6a48395-9ebc-465e-8505-c4b20d7b8e72.filesusr.com/ugd/81e12b_a89641557e194f14a1f46463bb6a2959.pdf?index=trueIn 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB10 5260 bytes
SHA-256: a1a96fc04727bc7a79220724344cdf25223e0b2bea733ca866f262f635efcbb3
font_01_sfnt_off0000fce6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCE6 10448 bytes
SHA-256: 5f4d966cfc0ffc5d5349ec2fc933182199f6f3ec8a57ba010bb9008ea5e5da11