Malicious PDF — malware analysis report

Static analysis result for SHA-256 b12e1e2994c4bbf9…

MALICIOUS

PDF

70.8 KB Created: 2021-03-25 09:24:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dfddf8f1855fe76c17e63c2f1350792c SHA-1: db9b3f27edb70140d47200b8a37d062c3930faf7 SHA-256: b12e1e2994c4bbf946d10f28fe2f79f1edd4adb9bd1fea8352f4ced94fae8a0f
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, suggesting a link farm or SEO spam operation. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external links point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • 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.
  • 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 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://crophysi.ru/wix?keyword=manual+instrucciones+mares+puck+pro
    • https://cdn-cms.f-static.net/uploads/4492257/normal_6019a213a4f05.pdf
    • https://sixonawujow.weebly.com/uploads/1/3/4/3/134369174/fodibukobimiw-maxito-nurilufuxageli.pdf
    • http://lowuwirakob.66ghz.com/graphite_gasket_material_sheet.pdf
    • https://zixixowiw.weebly.com/uploads/1/3/4/6/134605173/1491604.pdf
    • http://wiwovurezibaso.getenjoyment.net/pejodilipevulalumawejusi.pdf
    • http://kojazunupetip.mygamesonline.org/40254738100.pdf
    • https://static.s123-cdn-static.com/uploads/4453579/normal_600247ada40e1.pdf
    • https://sopaxibifezubin.weebly.com/uploads/1/3/4/6/134608036/351bc.pdf
    • http://kifejuja.medianewsonline.com/the_body_book_roz_maclean.pdf
    • https://static.s123-cdn-static.com/uploads/4401517/normal_5ff27bbd61603.pdf
    • http://wijasagasipode.getenjoyment.net/critical_history_of_western_philosophy_y_masih.pdf
    • https://vugigedekamem.weebly.com/uploads/1/3/4/3/134339685/lajojuz-vebariw-bojurog-jorogotowaxud.pdf
    • https://cdn-cms.f-static.net/uploads/4373999/normal_6040b2ae5c20d.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://mijikudetixo.epizy.com/cateterismo_vesical_tecnica.pdf
    • https://e082b6be-64c0-45f6-a8ff-82b9c6f476f0.filesusr.com/ugd/1479de_0bc50ac272d54fd8b62203f1bf8d7722.pdf?index=true
    • https://43081b45-6e48-4b43-b724-9328fda377ae.filesusr.com/ugd/26481d_76ca983c3f5848ea83f054fc86e182cc.pdf?index=true
    • https://df9240ce-57b4-430e-a582-521170ca5232.filesusr.com/ugd/10b03a_70f1f4277e26484f8e8c94796944b4ce.pdf?index=true
    • http://juborekif.atwebpages.com/nyc_economic_development_corporation_salary.pdf
    • https://488a161d-122f-4e25-b35e-34d1d0e27b34.filesusr.com/ugd/bbc910_a005f4d342594b099e59946221a42467.pdf?index=true
    • https://2dc0326d-ac60-47d8-bf46-f2dc9d334570.filesusr.com/ugd/21b4a7_75630bbaa82644c5a957d73660589b31.pdf?index=true
    • https://6a24fdd2-d4a5-4c4b-882b-0f3115751bcf.filesusr.com/ugd/04e6f9_f8b912ebd181489b81982dabed2416ca.pdf?index=true
    • https://60ceb029-6f78-4d42-8ea4-15ca08d8077a.filesusr.com/ugd/857e61_1c1c10f55fc942ac9c91500f79c398c6.pdf?index=true
    • http://perajida.epizy.com/career_path_management.pdf
    • http://goduziposu.rf.gd/how_to_apply_for_pa_snap_benefits.pdf
    • https://0a38098d-26c8-4844-ab0b-2dfc398d7f8d.filesusr.com/ugd/fffd55_d6b6d5b82c04428cb65c14b6e0fe6127.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d4d3.bin
748e97bf27c494230de7399c3358648bbc13ca0de929b4ed5dd1b617f4c9db57		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD4D3 5148 bytes
font_01_sfnt_off0000e64d.bin
1a9d756cd50b7c653b19b5bc52d18ebf4a05f1f8b537665e5cae0f35ac57780b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE64D 11628 bytes

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