Malicious PDF — malware analysis report

Static analysis result for SHA-256 10398756762de7b8…

MALICIOUS

PDF

67.9 KB Created: 2021-03-15 13:09:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: a25db5d7133c850157874c21157e06e4 SHA-1: 1c7d2a8fd08bf051b11a20744481207d2e8c2b2d SHA-256: 10398756762de7b85cf343765481942af9d3ec86ef873f99dd36640b0f0a9bf4
214 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, and contains links to known malicious redirector infrastructure. The embedded links, such as 'https://dafemum.ru/strik?utm_term=trigonometric+functions+of+any+angle+video', are likely intended to lead users to phishing or malware distribution sites. The PDF also hosts a link farm pointing to numerous other PDFs, suggesting a broader campaign to distribute malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://dafemum.ru/strik?utm_term=trigonometric+functions+of+any+angle+video In PDF document text
    • https://xejotonevuxujuj.weebly.com/uploads/1/3/1/3/131379732/joxunaguzajegogubi.pdfIn PDF document text
    • https://sazefowefojewen.weebly.com/uploads/1/3/4/8/134893887/gizozexemovetu.pdfIn PDF document text
    • https://femulonatif.weebly.com/uploads/1/3/4/5/134501650/begofanotozepaje.pdfIn PDF document text
    • https://gorokose.weebly.com/uploads/1/3/4/0/134042322/fuziwepi.pdfIn PDF document text
    • https://puzelosepe.weebly.com/uploads/1/3/5/3/135317481/kexabakufogat_lajobavejelog_tujumodi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/239babe7-eed9-4857-8502-962bcf99cc95/what_are_the_principles_of_physics.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f46a1af3-0429-41ea-95da-d94f65d29048/7059296974.pdfIn PDF document text
    • https://s3.amazonaws.com/luxaduzimase/altered_carbon_book_series_amazon.pdfIn PDF document text
    • https://6f465708-eb37-4ee2-8658-ebeec6cd93ea.filesusr.com/ugd/4bb103_6c620a54aa4b441f8ca50c6a21dec37b.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/penefelomiju/billericay_school_uniform.pdfIn PDF document text
    • https://c6926203-1eb9-401e-9afa-11f61f201807.filesusr.com/ugd/685707_2422b1841d3442ae9c989875419891a5.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/553e7af4-e5ef-4331-9c29-c351c5d72860/56471372475.pdfIn PDF document text
    • https://s3.amazonaws.com/jovekus/baby_george_rotisserie_chicken_cooking_time.pdfIn PDF document text
    • https://ebbb41b5-b8b7-4bfc-9e1b-23e79ad93844.filesusr.com/ugd/5eba67_724661a300744a7bbdbd4c503c37fb75.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/solonebosop/26840230207.pdfIn PDF document text
    • https://s3.amazonaws.com/pafexegud/what_is_the_function_of_a_claim_in_an_argumentative_essay.pdfIn PDF document text
    • https://s3.amazonaws.com/robumuduluwise/19212429723.pdfIn PDF document text
    • https://s3.amazonaws.com/zarevizebi/xefolurovusowunujafo.pdfIn PDF document text
    • https://69cf8a46-0d3d-4b71-8fd1-93df925da18e.filesusr.com/ugd/e4064d_b606fd9961a04c918997555401e5196a.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/5df4e00c-ba94-433a-ba03-46b0b5c210be/mitsubishi_air_conditioning_service_manuals.pdfIn PDF document text
    • https://s3.amazonaws.com/radubozufiwo/online_editor_extract_pages.pdfIn PDF document text
    • https://dec4a425-646e-450a-80ca-a73a75d058ad.filesusr.com/ugd/ba3095_155b6c1fd0424a1db47dc3bebf2e5fe0.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/juzowilipi/rukorolelu.pdfIn PDF document text
    • https://bb0106b8-f3e0-414b-a873-a0e24df3f2ad.filesusr.com/ugd/b84a33_809eba46f0e44c4cb725f6ae36725a31.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cf70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF70 5452 bytes
SHA-256: 9cc1452130f0b0c9dd2ec3349e66073de6862666d4cad4209a324b1af6dd5f0a
font_01_sfnt_off0000e1f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1F8 9380 bytes
SHA-256: 00e45ffc0dfa485c6522ab45184ff03019789cb7f9c8d884e6dd4e06e3a15893