Malicious PDF — malware analysis report

Static analysis result for SHA-256 422fdef570f4fb73…

MALICIOUS

PDF

82.2 KB Created: 2021-03-27 18:57:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 1c56f2288b500834f2b36f1478f6fe00 SHA-1: 115fa0cd340da30c3ad901bb0daa8fb5e8d95c76 SHA-256: 422fdef570f4fb73c4028e2f0a5a2c54c6779219ee0304a80ff02b3cfb8d0ae0
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 0.9991

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://maypoin.ru/123?utm_term=yaariyan+baarish+video+song++pagalworld PDF link annotation
    • http://luneket.iblogger.org/formato_certificado_medico_escolar_cdmx.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416939/normal_602de3e26c9b7.pdfIn PDF document text
    • http://golesaluwo.66ghz.com/3d_audio_songs_video.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459054/normal_602eeba38c1f4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463543/normal_605bb8b876e73.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409409/normal_5fd17c78acea9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406481/normal_6050ef34901a4.pdfIn PDF document text
    • https://nawexolaka.weebly.com/uploads/1/3/4/7/134704757/dujekakepizeza.pdfIn PDF document text
    • https://cdn.sqhk.co/vitikitema/8ie7gci/business_model_generation_english.pdfIn PDF document text
    • http://pozebesibi.22web.org/boleto_santander.pdfIn PDF document text
    • https://cdn.sqhk.co/pefevepufi/3DzzChj/fold_up_bed_chair_ikea.pdfIn PDF document text
    • https://cdn.sqhk.co/mexovaru/8heXW83/9708184417.pdfIn PDF document text
    • https://reluxepeguru.weebly.com/uploads/1/3/4/3/134363030/zejatibidatagememuri.pdfIn PDF document text
    • https://cdn.sqhk.co/fezusife/hjPghic/sumoxedikijudiji.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408587/normal_601af90ecf9e9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4443814/normal_5fcc90fb8c8e2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372373/normal_6052cd00bc4ca.pdfIn PDF document text
    • https://cdn.sqhk.co/vixonafom/qigieBJ/ancient_civilization_dance_history_roman.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
    • http://tirasidi.epizy.com/27508183065.pdfIn PDF document text
    • http://zedakukabizo.epizy.com/adobe_stock_apk.pdfIn PDF document text
    • http://gusenijit.epizy.com/etica_a_nicomaco_aristoteles_livro.pdfIn PDF document text
    • http://tosemasikelo.epizy.com/24245052509.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d6cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6CC 5284 bytes
SHA-256: 32ce3d08f5b287f8b6c0620acad16b6bd9d10a3b82e4c8a89327892024d2c12c
font_01_sfnt_off0000e8c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8C0 10664 bytes
SHA-256: de4a8bd6acb93bae35d9961c7ca5a5d28d48bbff4d79a1526763484fda9be243
font_02_sfnt_off00010d7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D7D 18776 bytes
SHA-256: 1df41416ece054d3cca32f135e48dc95f4d9c8a2bff4ba4edba1d14e21aabef6
font_03_sfnt_off00012ae4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AE4 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c