Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2fc2cbcb6e74a1e…

MALICIOUS

PDF

72.4 KB Created: 2021-04-02 19:56:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 1fbd090f69371c14d67a8ce297e18eda SHA-1: 5a158376ecff12e0481f95e157140b808c7bb5a9 SHA-256: b2fc2cbcb6e74a1e2ec12371b19130ade430c8a08932c31a15c3d45df038a5fa
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file functions as a link farm, containing numerous external URIs, with the primary suspicious URL being https://midufefew.ru/wix?keyword=harris+quantitative+chemical+analysis+7th+edition+solutions+manual+pdf. This suggests the document is likely used to redirect users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://midufefew.ru/wix?keyword=harris+quantitative+chemical+analysis+7th+edition+solutions+manual+pdf PDF link annotation
    • https://magagitu.weebly.com/uploads/1/3/5/9/135959352/5428308.pdfIn PDF document text
    • http://ins.expert/fopexepugotevufazemzifk.pdfIn PDF document text
    • http://sq11mini.com/nowelupodikipef17ld.pdfIn PDF document text
    • https://zudejafig.weebly.com/uploads/1/3/2/6/132681624/goridevuwerivon.pdfIn PDF document text
    • http://gopagafab.medianewsonline.com/69604363350.pdfIn PDF document text
    • https://teregurejojexol.weebly.com/uploads/1/3/4/8/134879353/4523773.pdfIn PDF document text
    • http://xajavawinereko.mywebcommunity.org/nararobalewesubifuguxeb.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://fccd5518-64e1-462d-9dbe-8d8d8a19ca7a.filesusr.com/ugd/eb005d_95201648889b4782a971829f38e24602.pdf?index=trueIn PDF document text
    • https://e0f910ba-f4aa-4d6b-87f6-24d78cda99ab.filesusr.com/ugd/cc15ef_0dceaff9c71d4205a136a08c6e723b55.pdf?index=trueIn PDF document text
    • https://d7d9470a-9784-4c28-ac68-b1ab0f70ddf3.filesusr.com/ugd/148484_36f36e9b559f48c186a94d9864c2033b.pdf?index=trueIn PDF document text
    • https://d1ee23ee-9ccf-45b0-80ef-1e1ff1f657c4.filesusr.com/ugd/9ef0c3_6d44429c0c454fd5b2533eec2d6539de.pdf?index=trueIn PDF document text
    • http://famekuputoda.myartsonline.com/wipavinogurepela.pdfIn PDF document text
    • http://zudupaxub.myartsonline.com/71907836990.pdfIn PDF document text
    • https://s3.amazonaws.com/fejakixoweka/activity_sheets_for_letter_p.pdfIn PDF document text
    • https://s3.amazonaws.com/tinezedu/aanandam_malayalam_movie_in_moviesda.pdfIn PDF document text
    • https://e6343aec-df69-40e7-9959-3c0c55bf73c9.filesusr.com/ugd/6a9017_76d1422789804c439b527f93cec94fc2.pdf?index=trueIn PDF document text
    • https://9c789f27-b70c-4c9d-9e83-211ee8f99b38.filesusr.com/ugd/bdeb4c_630e58669aef4c9ab27b510cb1725a73.pdf?index=trueIn PDF document text
    • https://d8d078ea-10ec-4787-8e21-ef6e32b87a24.filesusr.com/ugd/8f6098_41580e51629d400ea9f6e28023f81b36.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/lakujusitejojet/outdoor_survival_skills.pdfIn PDF document text
    • https://ad843f61-c544-48d7-8cfb-3c048b9edb46.filesusr.com/ugd/0dd9ed_a2915cdadb054a629620669ad675fc59.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jiguwuzobozobaz/laws_of_indices_negative_powers_worksheet.pdfIn PDF document text
    • https://40e214c1-1950-44e8-a195-e2c6eeb23253.filesusr.com/ugd/a517f4_6aad5f533eb14839afca7d924f5feaaa.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_off0000dabc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDABC 5724 bytes
SHA-256: 2c885172548099b1d4f0037ff22d867c7504f163567122a7e817c3f4e23c1190
font_01_sfnt_off0000ee1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE1F 11036 bytes
SHA-256: 5f56c6335e9a53ceec924b27ed470e726608db260db37ad93c87d3600c4c0ecc