Malicious PDF — malware analysis report

Static analysis result for SHA-256 506a2d5afb2e90bb…

MALICIOUS

PDF

86.0 KB Created: 2021-03-24 01:10:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: c9ca0e3021eea47d3856c6e40d02fb30 SHA-1: da8165d3572d2b924a2d5610d4d0970db003c134 SHA-256: 506a2d5afb2e90bb428c6dd333d3aedcf9cf6599d5d945a64837fe23975b1849
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 0.9995

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://kuzutuzo.ru/wix?keyword=apa+6+bullet+points PDF link annotation
    • http://teenagetutor.online/que_se_puede_comer_en_ayunosbewp.pdfIn PDF document text
    • https://cdn.sqhk.co/tosobulig/jhjijec/56379185280.pdfIn PDF document text
    • https://cdn.sqhk.co/gapekozuwa/Difjeje/muvirokikavagavifu.pdfIn PDF document text
    • https://cdn.sqhk.co/fedanojewem/cfHhfii/24233376563.pdfIn PDF document text
    • http://tublitalia.space/nujanezama864jl.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://uploads.strikinglycdn.com/files/127bac4f-a658-440e-b032-7d8c52b75558/dajopunejolojafavufu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/57ba8d4a-0b56-43aa-b9cd-6b17211ef8e1/kidde_i12060_recall.pdfIn PDF document text
    • https://ee6bc897-aa08-459d-b6e6-b1b1d69fcba1.filesusr.com/ugd/7ba596_86b3554c52864f8cbfebd83624deb796.pdf?index=trueIn PDF document text
    • https://d497f082-4895-42de-a72c-038d9367c8a3.filesusr.com/ugd/8e727b_fb46d0ab81a04303bbb1ec06c81b18bb.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/3b94532d-99c0-44c0-a51d-469a1702b709/why_is_my_att_u_verse_not_working.pdfIn PDF document text
    • https://69a21580-3c80-4f81-8097-1ec0bc18215d.filesusr.com/ugd/bd7df1_5391ec31fcc641feabfcf7b529878e0d.pdf?index=trueIn PDF document text
    • https://907864b8-ab38-4b43-b195-7646ee37c451.filesusr.com/ugd/c4b402_2b9ed7d619644531b8126e3828c7ad0e.pdf?index=trueIn PDF document text
    • https://30f21d72-2b41-4965-a7bc-2abb02bf1ded.filesusr.com/ugd/47e66e_fb60c8fc8f7b45f985ee23923db96505.pdf?index=trueIn PDF document text
    • https://af431a04-9ebc-4ea4-a98d-45e4ffbfad14.filesusr.com/ugd/485053_de3b883dedc645b09c88766bf3d363a4.pdf?index=trueIn PDF document text
    • https://170a7d3c-74f0-42f5-9ead-98ae292a4922.filesusr.com/ugd/a18aa6_33d682852225494a9a8cdd9afe6e3920.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/e24e4366-92bc-4da4-8ade-888a89a4d120/60181229807.pdfIn PDF document text
    • https://780c8f77-0f51-49ab-8dd1-60a90eb210a4.filesusr.com/ugd/1b8612_94f36a82bfa04612a55a06ab5b97ad47.pdf?index=trueIn PDF document text
    • https://b86313a8-447b-404d-ae6d-bc69740d899e.filesusr.com/ugd/e54fc7_a6c34aa1cb5e4a79bc71cb1efeab76f3.pdf?index=trueIn PDF document text
    • https://5bf49506-6ef1-42f8-8f90-7e3689255fd3.filesusr.com/ugd/8fe1bf_91c2ac6b380347dbb44ca40d2c1a3795.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/4ebeaa19-585e-4963-973e-f629ef0913c5/42958424998.pdfIn PDF document text
    • https://557345b1-98c6-442d-b460-9e357c178e5b.filesusr.com/ugd/dfb5f8_7cadccaa48114695b252060b00ef49c0.pdf?index=trueIn PDF document text
    • https://c38d9960-f3a4-46a0-b266-cfc7836dd0ed.filesusr.com/ugd/a8d9c8_7a77347de1ff4b83b51b4bf93b547cda.pdf?index=trueIn 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_off000106ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106AC 4880 bytes
SHA-256: cffe1005e07ca06208938bc431f88f35215946559ec1b88944b33280ae296156
font_01_sfnt_off0001174b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1174B 10824 bytes
SHA-256: 4bc7e05bcd6d72cf1a5b00ab385393df303190903a9ba41ffede41cee4ec6b16
font_02_sfnt_off00013c3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C3D 4324 bytes
SHA-256: ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230