Malicious PDF — malware analysis report

Static analysis result for SHA-256 d58c9109f24e701f…

MALICIOUS

PDF

83.0 KB Created: 2021-03-26 09:37:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 64d9635700fa559ed47e1556340b292f SHA-1: 27eefc52b3217c2a608c71f0c50b6d26f06fde95 SHA-256: d58c9109f24e701f6f069f39193ab245105b9ac8bcc55b7da8c1680e29c2410a
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm designed to direct users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were extracted, the PDF structure and embedded URLs point towards a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://soxebez.ru/strik?utm_term=how+to+program+sony+universal+remote+rm-vz320 PDF link annotation
    • http://bekopomulasebi.getenjoyment.net/golilajekewidigafoxowa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411503/normal_605a479d85a30.pdfIn PDF document text
    • http://tideparipawovu.mygamesonline.org/prinsip_atraumatic_care.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368487/normal_60405e91aa7f2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365608/normal_605510cc38f24.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389366/normal_6037a8bb1db97.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367013/normal_60086606ad511.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383449/normal_5fcc5db70f2b7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447276/normal_5fd665b96b4c3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4495034/normal_60003b8b3b019.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482631/normal_60519a7fa6f97.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4472494/normal_60465a5462a75.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4445114/normal_5fef3436cc04c.pdfIn PDF document text
    • http://vebilodugisugod.iblogger.org/yeast_taxonomy_classification.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://edcb5511-827b-40b0-97c1-3499c313f96b.filesusr.com/ugd/0779a3_a6171dc03c9e41d595df4ffe4138d7c4.pdf?index=trueIn PDF document text
    • http://visunes.myartsonline.com/stein_shakarchi_functional_analysis.pdfIn PDF document text
    • http://vimixof.onlinewebshop.net/how_do_you_know_if_your_flame_sensor_is_bad.pdfIn PDF document text
    • http://tefetuzuzip.myartsonline.com/punctuation_worksheet_ks2_tes.pdfIn PDF document text
    • https://38f9ccf9-db33-4582-994d-0ea518e52d38.filesusr.com/ugd/368de4_8cd3090a00bc41549db81bb48849d5a5.pdf?index=trueIn PDF document text
    • https://8b8c7005-3af0-45a1-8e5b-a6902caa9335.filesusr.com/ugd/dbd7d9_cc1477e4b5864a159cf65397a70a4d16.pdf?index=trueIn PDF document text
    • https://61249681-e2d1-4375-841a-b3723294d79c.filesusr.com/ugd/3d514e_859b9de033e044df8f1cf396f0120c44.pdf?index=trueIn PDF document text
    • https://4c2674ec-1430-4cec-a455-d6a35d10586e.filesusr.com/ugd/38955b_5f4075baa0714366a43374340590c26f.pdf?index=trueIn PDF document text
    • http://lunupoxupa.rf.gd/when_to_use_binomial_vs_cdf.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_off0000f890.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF890 5756 bytes
SHA-256: 3ffb0b814645a8a9bbbc2b8e1051937a89822d204f725d893857f51e0e625591
font_01_sfnt_off00010c3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C3A 10488 bytes
SHA-256: a89afb63c53150ec1ef541bbccecb276e18c42fe9aff7a9d246b7f6c1a21f3ae
font_02_sfnt_off00013026.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13026 4324 bytes
SHA-256: 7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71