Malicious PDF — malware analysis report

Static analysis result for SHA-256 407bcc6186757d7e…

MALICIOUS

PDF

81.7 KB Created: 2021-03-10 13:41:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: f295d0541b6e95f9387453aabbd23920 SHA-1: b29cf45916962eef6637c65bf4498fd2416b588f SHA-256: 407bcc6186757d7ed95ce20bfcb14ed49a88de26a35f506d09fb7a845c0ac5ee
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous external links, many hosted on disposable domains, suggesting a link farm or SEO spam campaign. The ML classifier strongly indicates maliciousness. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attempt to redirect users to potentially malicious content, possibly disguised as game ROMs or other search results.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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://golowaki.ru/wix?keyword=mario+64+rom+online PDF link annotation
    • https://milatesedupodil.weebly.com/uploads/1/3/1/4/131437919/divegureb-dexobob-tokapitutute.pdfIn PDF document text
    • https://kerozuvesiduzam.weebly.com/uploads/1/3/4/3/134375161/rekafojuxirof-sesen.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454438/normal_601404be7133a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4495264/normal_5fe441cb0958c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454303/normal_601a39458e510.pdfIn PDF document text
    • https://pikoxujedogusu.weebly.com/uploads/1/3/4/6/134665618/189ea35d6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410201/normal_5fd1f052bde50.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490377/normal_60208f93db387.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/rebesudanolo/impersonal_report_structures_wiczenia.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5d4996de-eae5-4c2c-b44c-8ea56285d087/family_feud_theme_song_remix.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4e6d7c8c-64f2-4a51-a89e-ccf6cf7cb535/horus_heresy_book_7_inferno_download.pdfIn PDF document text
    • https://aabf49e0-5477-4fd2-8456-a986ef8f2a87.filesusr.com/ugd/9e14ca_5373b5eee3974bf4a8b601c4e17861a8.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/a75def62-e688-42f4-b0d9-62582f469ab2/zanigup.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1ba9f27a-73e2-44e1-8116-a70d72e0e03f/cmbyn_sequel_release_date.pdfIn PDF document text
    • https://8ac5c8e1-9174-427d-95c2-90bebb9f105a.filesusr.com/ugd/44b221_faa75e7d09664156b93ee8b49f279b3b.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c15f7b04-d984-447c-ae2e-7047e4ad6e07/19153059735.pdfIn PDF document text
    • https://s3.amazonaws.com/tapelu/cardiac_rehabilitation_physical_therapy_guidelines.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_off0000ea0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA0F 4900 bytes
SHA-256: 641eb1206e1bbcb901282e313de7f7091fb6b12d6e0fc8628cf4a3171648eb71
font_01_sfnt_off0000fab5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAB5 10816 bytes
SHA-256: 14faf5e70f20f4953e4f57bf83739f8b084841b03f1f8999a442bbf695f8f5b1
font_02_sfnt_off00011f9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F9D 17148 bytes
SHA-256: bbd249dded47f977edaf3791a29fed04c2b3306361f46cbdde51624fe5fe7b5e

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