Malicious PDF — malware analysis report

Static analysis result for SHA-256 fcbcf1101fcf16ea…

MALICIOUS

PDF

70.7 KB Created: 2021-03-04 15:14:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: e020b5b2c69d31166056816dde81df6a SHA-1: b4eae7f34406d43880e0e98e654de46a447a4da5 SHA-256: fcbcf1101fcf16eac236000498d9deac46a029e5f9214505f552e76784535bfe
186 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, with a significant number pointing to disposable hosting, indicating a link farm or redirection scheme. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. The embedded URLs and the heuristic findings point towards an attempt to drive traffic to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://druttle.ru/wix?keyword=brotopia+pdf+download PDF link annotation
    • http://xepidenad.scienceontheweb.net/davakifamewuloga.pdfIn PDF document text
    • http://xevusezes.medianewsonline.com/data_structures_in_cpp_tutorial.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://85d2c5a2-fc31-4f76-86b4-4ebe2abe2bf4.filesusr.com/ugd/a8cc01_206c3dbf02424a07a9b80b7b4a926eb2.pdf?index=trueIn PDF document text
    • https://627f215e-41ba-4aa4-9906-5f9f9d117739.filesusr.com/ugd/8ab72e_0cc0df64ed9b4615b74f758fc984064d.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/b23c41f6-2302-4ff8-9164-89fcf5bffe0b/what_colors_are_positive_and_negative_on_a_phone_charger.pdfIn PDF document text
    • https://4541bc1c-e35c-4de3-bb44-1f53c3e1a56d.filesusr.com/ugd/68f66e_000f8e50bc8c42bdbf2e05ae12741f89.pdf?index=trueIn PDF document text
    • https://d7ae471b-a447-437d-81b4-4e603f8679d9.filesusr.com/ugd/0a3240_0d8bf8de90644fedbaa45b0207009e92.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/f9578925-742e-41fb-aa45-97acdd0953b5/13660251899.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5784f82c-ec09-4841-a7a8-940f69ca723b/64752298007.pdfIn PDF document text
    • https://153f2bed-3501-4ec5-9468-ed1987511f6d.filesusr.com/ugd/f67134_0dd9e1fbe9c24ce690a702568fad291a.pdf?index=trueIn PDF document text
    • https://fa90eb46-aa9b-4fd1-a2e8-e903ec8e50a4.filesusr.com/ugd/575fb0_00bb9ec3cf7c43ca95f154856ac42037.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/a3f7723b-f8c3-4e2c-ad91-cf7782bcc7ef/jepamapofufifazil.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4f6007bb-a3b3-4f90-a808-68fb3d23b82a/3862775889.pdfIn PDF document text
    • https://b913155d-2712-4fd4-bcc6-651970a8c456.filesusr.com/ugd/e39924_23d6e4e8b80646598f14991e0635078c.pdf?index=trueIn PDF document text
    • https://c6f55193-7475-4343-97dd-33cb3b141b6a.filesusr.com/ugd/808d8c_26ff92ffc5d740538a3d8aa6a7047b0f.pdf?index=trueIn PDF document text
    • https://e824aeac-d22a-4b45-bb3c-17051d6ee04f.filesusr.com/ugd/de60da_fe8dbc2a9173446e8b29297acaf47afc.pdf?index=trueIn PDF document text
    • https://d4f4546a-a836-4b3d-8651-c56b89608eca.filesusr.com/ugd/3e9e83_b8fe66687b8b4959ab12c6809c76869c.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/59a4aedf-5e3c-48c4-8d2e-4789d04090b3/what_is_conduction_velocity_distribution.pdfIn PDF document text
    • https://010f2e21-25ca-4560-806d-08cbbb7c7db1.filesusr.com/ugd/74a852_227ab11c933d4783a45f1c4ba30d30e4.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/3d748acd-0ae6-4036-9eba-595695e4342b/49944826361.pdfIn PDF document text
    • https://7fc1e5b2-1dd8-4457-9de2-3dea1ab9f589.filesusr.com/ugd/fedd61_2cf8a21e6e894361b0adf1422e1c0bfd.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/cb28dc07-2632-44be-bf41-2174c7cf6b9f/36540316366.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fa060c31-6c87-487f-9238-8c6d826ef8d5/47757186795.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000da18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA18 4996 bytes
SHA-256: 7baab2a887493d245b38247fad3b541f56a8e51f8a90b7c28f255ff9126666d3
font_01_sfnt_off0000eb3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB3B 10064 bytes
SHA-256: 00cea00fa0b24f060468350f26a48425befc4b8689fd0b82db02045addabf840

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